A force-boosting device for a material testing machine

Abstract

This invention discloses a force-enhancing device for a material testing machine, overcoming the problems of existing force-enhancing devices such as changes in force direction, complex internal structure, and changes in force amplification ratio. The force-enhancing device includes a testing machine measuring shaft assembly, a rear sleeve assembly, a front sleeve assembly, an upper wedge assembly, a lower wedge assembly, and a hydraulic cylinder assembly. The upper wedge assembly is located directly above the lower wedge assembly. The measuring shaft assembly is mounted on the upper vertical wedge block in the upper wedge assembly using its measuring shaft connecting plate. The hydraulic cylinder assembly is mounted on the lower vertical wedge block in the lower wedge assembly using its hydraulic cylinder connecting plate. The rear sleeve assembly and the front sleeve assembly are vertically and symmetrically mounted on the front and rear sides of the upper and lower wedge assemblies. The top ends of the upper wedge assembly and the rear and front sleeve assemblies are rotatably connected, and the bottom ends of the lower wedge assembly and the rear and front sleeve assemblies are rotatably connected. The middle end of the rear sleeve assembly is rotatably connected to the middle end of the front sleeve assembly through a lever connecting shaft.

Description

Technical Field

[0001] The present invention relates to a testing apparatus, and more specifically, to a force-enhancing device for a material testing machine. Background Technology

[0002] Currently, most of the mechanical properties of materials are measured using material testing machines, and the working capacity of the drive unit determines the tensile and compressive properties of the material testing machine. How to use a small drive unit to complete large-load tensile and compressive tests on a material testing machine without introducing hydraulic, control, or other systems is a problem that manufacturers have been trying to solve but have not yet solved. At the same time, in the upgrading and modification of material testing machines, how to improve the tensile and compressive properties of the machine without changing the drive unit, but only by adding mechanical structures, is also a problem that designers want to solve.

[0003] Currently, many mechanical structures can achieve force amplification, such as levers, movable pulley systems, cams, and wedge mechanisms. Levers can amplify force with a constant amplification ratio, but the direction of the forces at both ends of the lever constantly changes. Movable pulley systems can amplify force, but the amplification ratio depends on the number of movable pulleys inside the mechanism; a large amplification ratio leads to a complex internal mechanical structure. Cam mechanisms can amplify force, but the amplification ratio is not constant. Wedge mechanisms can amplify force, but the direction of the forces at both ends of the wedge changes. Designing a mechanical structure that can achieve a constant amplification ratio while ensuring that the direction of the forces at both ends of the mechanism remains unchanged is a problem that needs to be solved.

[0004] In summary, this invention proposes a force-enhancing device for a material testing machine, which cleverly utilizes the lever and wedge force-enhancing principles to solve problems such as changes in the direction of force application, complex internal structure, and changes in the force-enhancing ratio in existing technologies, thereby significantly increasing the load output capacity of the material testing machine. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the problems of existing force amplification devices having changes in the direction of force application, complex internal structure, and changes in force amplification ratio, and to provide a force amplification device for a material testing machine.

[0006] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0007] The force-enhancing device for a material testing machine includes a testing machine measuring shaft assembly, a rear sleeve assembly, a front sleeve assembly, an upper wedge assembly, a lower wedge assembly, and a hydraulic cylinder assembly.

[0008] The upper wedge assembly is located directly above the lower wedge assembly. The testing machine measuring axis assembly is installed on the upper vertical left wall of the upper vertical wedge block in the upper wedge assembly via the measuring axis connecting plate and bolts. The hydraulic cylinder assembly is installed on the lower vertical left wall of the lower vertical wedge block in the lower wedge assembly via the hydraulic cylinder connecting plate and bolts.

[0009] The rear sleeve assembly and the front sleeve assembly are vertically and symmetrically installed on the front and rear sides of the upper wedge assembly and the lower wedge assembly. The top end of the rear sleeve assembly is inserted into the through hole on the upper horizontal wedge block in the upper wedge assembly through the upper sleeve connecting shaft therein. The upper sleeve connecting shaft, which is exposed above the upper horizontal wedge block, is then inserted into the top end of the front sleeve assembly. The front and rear ends of the upper sleeve connecting shaft are fixedly connected to the top ends of the rear sleeve assembly and the front sleeve assembly. The middle section of the upper sleeve connecting shaft is rotatably connected to the upper horizontal wedge block.

[0010] The bottom end of the rear sleeve assembly is inserted into the through hole on the lower horizontal wedge block in the lower wedge assembly through the lower sleeve connecting shaft therein. The lower sleeve connecting shaft, which exposes the lower horizontal wedge block, is then inserted into the bottom end of the front sleeve assembly. The front and rear ends of the lower sleeve connecting shaft are fixedly connected to the bottom ends of the rear sleeve assembly and the front sleeve assembly, while the middle section of the lower sleeve connecting shaft is rotatably connected to the lower horizontal wedge block.

[0011] The middle end of the rear sleeve assembly is inserted into the middle end of the front sleeve assembly through a lever coupling therein, and the front and rear ends of the lever coupling are rotatably connected to the middle ends of the rear sleeve assembly and the front sleeve assembly.

[0012] The testing machine measuring shaft assembly described in the technical solution includes a testing machine fixture, a testing machine measuring shaft, a measuring shaft connecting plate, and a measuring shaft nut. The testing machine fixture is a YG-T004B manual wedge fixture. The testing machine measuring shaft is a stepped shaft type non-standard part. The large-diameter end of the measuring shaft has an axially machined threaded hole, and the rotation axis of the threaded hole is collinear with the rotation axis of the testing machine measuring shaft. The thread structure is the same as the thread structure on the connecting shaft at the bottom of the testing machine fixture. The small-diameter end of the testing machine measuring shaft is a bolt rod, and the bolt rod's rotation axis... The rotation axis of the wire and the threaded hole are collinear. The length of the bolt rod should be greater than the sum of the thickness of one side of the measuring shaft connecting plate and the thickness of the measuring shaft nut. The measuring shaft connecting plate is a non-standard part, made by cutting a section of equilateral angle steel with a model of 50*50*10. The width of the cut section is greater than the side length of the equilateral angle steel. A through hole is machined at the center of one side of the measuring shaft connecting plate, and two through holes with the same structure are machined on the other side. The two through holes are symmetrically arranged about the short axis of symmetry of the other side, and the center distance between the two through holes is greater than twice the diameter of the through hole.

[0013] The testing machine fixture is placed vertically with the wedge-shaped groove opening facing upwards; the testing machine measuring shaft is placed vertically with the threaded hole facing upwards; the connecting shaft at the lower end of the testing machine fixture is inserted into the threaded hole of the testing machine measuring shaft, and the two are connected by threads; the rotation axis of the connecting shaft in the testing machine fixture is collinear with the rotation axis of the testing machine measuring shaft; the inner arc surface of the measuring shaft connecting plate is placed downwards; the bolt rod of the testing machine measuring shaft is inserted into the center through hole on one side of the measuring shaft connecting plate; the measuring shaft nut is fitted onto the bolt rod, fixing the testing machine measuring shaft to one side of the measuring shaft connecting plate.

[0014] The rear sleeve assembly described in the technical solution includes a lower sleeve connecting shaft, sleeve block No. 1, pin No. 1, lower lever shaft No. 1, lever connecting shaft, rear lever bearing, upper lever shaft No. 1, upper sleeve connecting shaft, sleeve block No. 2, and pin No. 2. The upper lever shaft No. 1 is placed directly above the lower lever shaft No. 1, and both are placed vertically. The upper bearing seat in the upper lever shaft No. 1 is placed opposite to the lower bearing seat in the lower lever shaft No. 1. The rear lever bearing is placed in the bearing seat formed by the upper and lower bearing seats, and the three are fixedly connected by screws and nuts. Insert the rear end of the lower sleeve connecting shaft into the center hole of the small cube on sleeve block 1, and use pin 1 to fix the lower sleeve connecting shaft and sleeve block 1 in place. The connection method between the upper sleeve connecting shaft, sleeve block 2 and pin 2 is similar. Insert the lower lever shaft of lower lever shaft 1 into the center hole of the large cube on sleeve block 1, and insert the upper lever shaft of upper lever shaft 1 into the through hole of the large cube on sleeve block 2. Finally, insert the rear end of the lever connecting shaft into the inner ring of the lever rear bearing, and make the rear end of the lever connecting shaft protrude from the inner ring of the lever rear bearing.

[0015] The upper wedge assembly described in the technical solution includes a return spring, an upper vertical wedge block, a guide block assembly No. 1, a guide block assembly No. 2, an upper horizontal rear bearing, an upper horizontal wedge block, an upper horizontal front bearing, an upper guide rail assembly, and a guide block assembly No. 3. The top of the vertically placed return spring and the bottom surface of the upper vertical wedge block are evenly and symmetrically arranged in contact, and the top of the return spring and the bottom surface of the upper vertical wedge block are fixedly connected by welding. The upper guide rail assembly is welded to the inclined top wall of the upper vertical wedge block through a connecting plate No. 2, and the edge of the upper guide rail assembly is aligned with the edge of the inclined top wall of the upper vertical wedge block. The guide block assembly No. 3 and the guide block assembly No. 1 are respectively mounted on rectangular grooves on the front and rear walls of the upper vertical wedge block through rolling bearings No. 3 and No. 1. The outer circumferential surface of the moving bearing is in contact with the bottom surface of the rectangular groove; the upper horizontal wedge is mounted on the upper guide rail assembly, and the bottom surface of the rectangular groove on the inclined bottom wall of the upper horizontal wedge is in contact with the outer cylindrical surface of the No. 1 cylindrical roller in the upper guide rail assembly, and the short edge of the inclined bottom wall of the upper horizontal wedge is horizontally aligned with the short edge of the upper guide rail assembly; the upper horizontal front bearing and the upper horizontal rear bearing are mounted in the countersunk holes on the front and rear walls of the upper horizontal wedge; the No. 2 guide block assembly is mounted on the rectangular groove on the top wall of the upper horizontal wedge through three identical No. 2 rolling bearings, and the outer circumferential surface of the three identical No. 2 rolling bearings is in contact with the bottom surface of the rectangular groove; the other ends of the No. 1 guide block assembly, the No. 2 guide block assembly, and the No. 3 guide block assembly are all welded and fixedly connected to the test machine frame.

[0016] The guide block assembly No. 2 described in the technical solution includes a baffle No. 3, three identical rolling bearings No. 2, and a baffle No. 4. The rolling bearings No. 2 are 60000 type deep groove ball bearings, fitted in the middle of the stepped shaft No. 2. The diameters at both ends of the stepped shaft are equal, and their diameters are equal to the diameters of the three through holes on the baffles No. 3 and No. 4. The diameter at the middle of the stepped shaft is equal to the diameter of the inner ring of the rolling bearing No. 2. The baffles No. 3 and No. 4 are structurally identical parts, and are made from two 150mm length pieces of unequal-sided angle steel with dimensions of 35×10×8. This structure is made by machining three identical large-diameter through holes and four identical small-diameter through holes on the long side of an unequal-sided angle steel. The three identical large-diameter through holes are symmetrically arranged about the short axis of symmetry of the long side wall, with the center of each hole 25mm from the outer wall of the short side wall, and the center distance between adjacent large-diameter through holes is 35mm. The small-diameter through holes are also symmetrically arranged about the short axis of symmetry of the short side wall, with the center of each hole 45mm from the outer wall of the short side wall, and the center distance between adjacent small-diameter through holes is 24mm. The rotation axes of the three large-diameter through holes and the four small-diameter through holes are parallel.

[0017] Baffle No. 4 and Baffle No. 3 are placed symmetrically, so that the three large-diameter through holes and four small-diameter through holes on Baffle No. 4 and Baffle No. 3 are aligned. Three identical No. 2 rolling bearings are fitted in the middle of three identical No. 2 stepped shafts. The two ends of the three identical No. 2 stepped shafts are installed in the three large-diameter through holes on Baffle No. 4 and Baffle No. 3. Baffle No. 3 and Baffle No. 4 are fixedly connected by four identical screws and nuts.

[0018] The lower wedge assembly described in the technical solution includes a lower vertical wedge block, a guide block assembly (No. 4), a lower guide rail assembly, a lower horizontal rear bearing, a guide block assembly (No. 5), a lower horizontal wedge block, a lower horizontal front bearing, a guide block assembly (No. 6), and a guide block assembly (No. 7). The lower horizontal top and bottom walls of the lower horizontal wedge block are placed horizontally, and the lower horizontal front and rear bearings are installed in countersunk holes on the lower horizontal front and rear walls of the lower horizontal wedge block. The lower guide rail assembly is installed in the lower horizontal wedge block's lower section via a connecting plate (No. 4). On the left-hand inclined wall, the outer cylindrical surface of the No. 2 cylindrical roller in the lower guide rail assembly is non-contactly connected to the bottom of the rectangular groove on the left-hand inclined wall. The short side of the lower guide rail assembly is aligned with the top and bottom edges of the left-hand inclined wall. One end of the No. 5 guide block assembly and the No. 6 guide block assembly are respectively installed on the rectangular grooves on the top and bottom walls of the lower horizontal inclined wedge through the No. 5 rolling bearing and three identical No. 6 rolling bearings. The outer ring surfaces of the No. 5 rolling bearing and the three identical No. 6 rolling bearings are in contact with the bottom of the rectangular groove.

[0019] The lower vertical wedge is mounted on the lower guide rail assembly. The bottom of the rectangular groove on the lower vertical right inclined wall of the lower vertical wedge is in contact with the surface of the No. 2 cylindrical roller in the lower guide rail assembly. The short side of the lower vertical right inclined wall of the lower vertical wedge is horizontally aligned with the short side of the lower guide rail assembly (5-3). One end of the No. 7 guide block assembly and the No. 4 guide block assembly is mounted on the rectangular groove on the lower vertical front wall and lower vertical rear wall of the lower vertical wedge through three identical No. 7 rolling bearings and three identical No. 4 rolling bearings. The outer ring surfaces of the three identical No. 7 rolling bearings and the three identical No. 4 rolling bearings are in contact with the bottom of the rectangular groove. The other ends of the No. 4 guide block assembly, the No. 5 guide block assembly, the No. 6 guide block assembly and the No. 7 guide block assembly are all welded and fixed to the frame of the testing machine.

[0020] The upper vertical wedge block described in the technical solution is a wedge block composed of an upper vertical front wall, an upper vertical rear wall, an upper vertical left wall, an upper vertical bottom wall, and an upper vertical inclined top wall. The upper vertical front wall and upper vertical rear wall are right-angled triangular walls with identical structures, placed parallel and symmetrically. The upper vertical left wall, upper vertical bottom wall, and upper vertical inclined top wall are rectangular walls of equal width. The left ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical left wall. The bottom ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical bottom wall. The bottom end of the upper vertical left wall is perpendicularly connected to the left end of the upper vertical bottom wall. The top, bottom, front, and rear ends of the upper vertical inclined top wall are arranged in sequence. It connects to the top of the upper vertical left wall, the right end of the upper vertical bottom wall, the top of the upper vertical front wall, and the top of the upper vertical rear wall. The angle between the right end of the upper vertical bottom wall and the right end of the upper vertical sloping top wall is 30°. A rectangular groove is vertically set at the left end of the upper vertical front wall and the upper vertical rear wall. The center line of the rectangular groove is parallel to the short right-angled side of the upper vertical front wall and the upper vertical rear wall. A rectangular sloping groove is set at the center of the upper vertical sloping top wall along the length of the upper vertical sloping top wall. The center line of the rectangular sloping groove is parallel to the long sloping side of the upper vertical sloping top wall. Two threaded holes are machined at the lower end of the upper vertical left wall. The threaded holes are symmetrically arranged along the long axis of symmetry of the upper vertical left wall.

[0021] The upper horizontal wedge block described in the technical solution is a wedge block composed of an upper horizontal front wall, an upper horizontal rear wall, an upper horizontal right wall, an upper horizontal bottom wall, and an upper horizontal top wall. The upper horizontal front wall and upper horizontal rear wall are right-angled triangular walls with identical structures, placed parallel and symmetrically. The upper horizontal right wall, upper horizontal bottom wall, and upper horizontal top wall are rectangular walls of equal width. The right ends of the upper horizontal front wall and upper horizontal rear wall are perpendicularly connected to the upper horizontal right wall. The right end of the upper horizontal top wall is perpendicularly connected to the top of the upper horizontal right wall. The tops of the upper horizontal front wall and upper horizontal rear wall are perpendicularly connected to the upper horizontal top wall. The bottom end of the upper horizontal right wall is connected to the bottom end of the upper horizontal bottom wall. Next, the top, bottom, front, and rear ends of the upper horizontal sloping bottom wall are connected to the left end of the upper horizontal top wall, the bottom end of the upper horizontal right wall, the bottom end of the upper horizontal front wall, and the bottom end of the upper horizontal rear wall in sequence. The angle between the top end of the upper horizontal sloping bottom wall and the left end of the upper horizontal top wall is 30°. A sloping rectangular groove is machined at the center of the sloping bottom wall and along the longitudinal direction of the sloping bottom wall. A rectangular through groove is machined at the center of the upper horizontal top wall. The center lines of the sloping rectangular groove and the rectangular through groove coincide with the long axis of symmetry of the sloping bottom wall and the upper horizontal top wall. A countersunk through hole is machined on the upper horizontal front wall and the upper horizontal rear wall. The rotation axis of the countersunk through hole is collinear and perpendicular to the upper horizontal front wall and the upper horizontal rear wall.

[0022] The lower vertical wedge block described in the technical solution is a wedge block composed of a lower vertical front wall, a lower vertical rear wall, a lower vertical left wall, a lower vertical bottom wall, a lower vertical top wall, and a lower vertical right wedge block. The lower vertical front wall and lower vertical rear wall are right-angled trapezoidal walls with identical structures, placed parallel and symmetrically. The lower vertical left wall, lower vertical bottom wall, lower vertical top wall, and lower vertical right wedge block are rectangular walls of equal width. The lower vertical front wall, lower vertical rear wall, and lower vertical left wall are quadrilateral walls of equal height. The left ends of the lower vertical front wall and lower vertical rear wall are perpendicularly connected to the lower vertical left wall. The bottom ends of the lower vertical front wall and lower vertical rear wall are perpendicularly connected to the lower vertical bottom wall. The bottom end of the lower vertical left wall is perpendicularly connected to the left end of the lower vertical bottom wall. The top of the vertical left wall is perpendicularly connected to the front, rear, and left ends of the lower vertical top wall in sequence. The top, bottom, front, and rear ends of the lower vertical right inclined wall are connected to the right ends of the lower vertical top wall, the lower vertical bottom wall, the lower vertical front wall, and the lower vertical rear wall in sequence. The angle between the right end of the lower vertical top wall and the top of the lower vertical right inclined wall is 60°. A rectangular groove is machined on the lower vertical front wall and the lower vertical rear wall, with the center line of the rectangular groove perpendicular to the lower vertical top wall and the lower vertical bottom wall of the wedge block. A rectangular groove is machined in the middle of the lower vertical right inclined wall of the wedge block along its length, with the center line of the rectangular groove coinciding with the long axis of symmetry of the lower vertical right inclined wall. Two threaded holes are machined on the lower vertical left wall, and the threaded holes are symmetrically arranged along the long axis of symmetry of the lower vertical left wall.

[0023] The lower horizontal wedge block described in the technical solution is a wedge block composed of a lower horizontal front wall, a lower horizontal rear wall, a lower horizontal left oblique wall, a lower horizontal bottom wall, a lower horizontal top wall, and a lower horizontal right wall. The lower horizontal front wall and lower horizontal rear wall are right-angled trapezoidal walls with identical structures, placed parallel and symmetrically. The lower horizontal left oblique wall, lower horizontal bottom wall, lower horizontal top wall, and lower horizontal right wall are rectangular walls of equal width. The lower horizontal front wall, lower horizontal rear wall, and lower horizontal right wall are quadrilateral walls of equal height. The right ends of the lower horizontal front wall and lower horizontal rear wall are perpendicularly connected to the lower horizontal right wall. The bottom ends of the lower horizontal front wall and lower horizontal rear wall are connected to the lower horizontal right wall. The horizontal bottom wall is vertically connected, and the bottom end of the lower horizontal right wall is vertically connected to the right end of the lower horizontal bottom wall. The left ends of the lower horizontal front wall, lower horizontal rear wall, lower horizontal top wall, and lower horizontal bottom wall are connected to the front end, rear end, top end, and bottom end of the lower horizontal left inclined wall in sequence. The angle between the left end of the lower horizontal bottom wall and the bottom end of the lower horizontal left inclined wall is 60°. A countersunk hole is machined on the lower horizontal front wall and lower horizontal rear wall. Three rectangular grooves are machined at the center of the lower horizontal top wall, lower horizontal bottom wall, and lower horizontal left inclined wall. The center line of the rectangular grooves coincides with the long axis of symmetry of the lower horizontal top wall, lower horizontal bottom wall, and lower horizontal left inclined wall, respectively.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The force-enhancing device for a material testing machine described in this invention employs a mechanical device combining wedges, sleeves, and levers, which significantly improves the load output capacity of the material testing machine, with a constant force enhancement ratio and coaxial output of input and output forces;

[0026] 2. The force-enhancing device for a material testing machine described in this invention can significantly reduce the basic size of the material testing machine and lower manufacturing costs;

[0027] 3. The force-enhancing device for a material testing machine described in this invention is also applicable to the upgrading and transformation of existing material testing machines, without the need to introduce other systems, and the transformation cost is low; Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings:

[0029] Figure 1 This is an axonometric projection view of the force-enhancing device structure for a material testing machine according to the present invention;

[0030] Figure 2 This is a front view of the structure of a force-enhancing device for a material testing machine according to the present invention;

[0031] Figure 3 This is a top view of the structure of a force-enhancing device for a material testing machine according to the present invention;

[0032] Figure 4 This is a left view of the structure of a force-enhancing device for a material testing machine according to the present invention;

[0033] Figure 5 yes Figure 3 Half-section view of the structure at the CC position;

[0034] Figure 6 This is an exploded axonometric projection view of the upper inclined wedge assembly structure in a force-enhancing device for a material testing machine according to the present invention.

[0035] Figure 7 This is an exploded axonometric projection view of the lever assembly structure in a force-enhancing device for a material testing machine according to the present invention.

[0036] Figure 8 This is an exploded axonometric projection view of the lower inclined wedge assembly structure in a force-enhancing device for a material testing machine according to the present invention.

[0037] Figure 9 yes Figure 6 Axonometric projection exploded and magnified view of the structure of the upper and middle guide rail assembly;

[0038] Figure 10This is a schematic diagram illustrating the mechanism motion principle of a force-increasing device for a material testing machine according to the present invention;

[0039] Figure 11 This is a force analysis diagram of the lower inclined wedge assembly in a force-enhancing device for a material testing machine according to the present invention;

[0040] Figure 12 This is a force analysis diagram of the lever assembly in a force-enhancing device for a material testing machine according to the present invention;

[0041] Figure 13 This is a force analysis diagram of the upper inclined wedge assembly in a force-enhancing device for a material testing machine according to the present invention;

[0042] Figure 14 This is a motion flow diagram of a force-enhancing device for a material testing machine according to the present invention;

[0043] Figure 15 This is a flowchart of the force transmission process in a force-enhancing device for a material testing machine according to the present invention.

[0044] In the diagram: 1. Testing machine measuring shaft assembly, 1-1. Testing machine fixture, 1-2. Testing machine measuring shaft, 1-3. Measuring shaft connecting plate, 1-4. Measuring shaft nut, 2. Rear sleeve assembly, 2-1. Lower sleeve connecting shaft, 2-2. Sleeve block No. 1, 2-3. Pin No. 1, 2-4. Lower lever shaft No. 1, 2-5. Nut No. 1, 2-6. Lever connecting shaft, 2-7. Lever rear bearing, 2-8. Screw No. 1, 2-9. Upper lever shaft No. 1, 2-10. Upper sleeve connecting shaft, 2-11. Sleeve block No. 2, 2-12. Pin No. 2, 3. Front sleeve assembly, 3-1. Pin No. 3, 3-2. Sleeve block No. 3, 3-3. 2. Upper lever shaft, 3-4. Screw No. 2, 3-5. Lever front bearing, 3-6. Nut No. 2, 3-7 .2 Lower lever shaft, 3-8.4 pins, 3-9.4 sleeve block, 4. Upper wedge assembly, 4-1. Return spring, 4-2. Upper vertical wedge block, 4-3.1 guide block assembly, 4-3-1.3 screw, 4-3-2.1 baffle, 4-3-3.1 rolling bearing, 4-3-4.2 baffle, 4-3-5.3 nut, 4-4.2 guide block assembly, 4-4-1.4 screw, 4-4-2.3 baffle, 4-4-3.2 rolling bearing, 4-4-4.4 baffle, 4-4-5.4 nut, 4-5. Upper horizontal rear bearing, 4-6. Upper horizontal wedge block, 4-7. Upper horizontal front bearing, 4-8. Upper guide rail assembly, 4-8-1.1 small screw, 4 -8-2.1 connecting plate, 4-8-3.1 cylindrical roller, 4-8-4.2 connecting plate, 4-9.3 guide block assembly, 4-9-1.5 nut, 4-9-2.5 baffle, 4-9-3.3 rolling bearing, 4-9-4.6 baffle, 4-9-5.5 screw, 5. lower wedge assembly, 5-1. lower vertical wedge block, 5-2.4 guide block assembly, 5-2-1.6 screw, 5-2-2.7 baffle, 5-2-3.4 rolling bearing, 5-2-4.8 baffle, 5-2-5.6 nut, 5-3. lower guide rail assembly, 5-3-1.2 small screw, 5-3-2.3 connecting plate, 5-3-3.2 cylindrical roller, 5-3-4.4 connecting plate Connecting plate, 5-4. Lower horizontal rear bearing, 5-5.5 guide block assembly, 5-5-1.7 screw, 5-5-2.9 baffle, 5-5-3.5 rolling bearing, 5-5-4.10 baffle, 5-5-5.7 nut, 5-6. Lower horizontal wedge block, 5-7. Lower horizontal front bearing, 5-8.6 guide block assembly, 5-8-1.8 screw, 5-8-2.11 baffle, 5-8-3.6 rolling bearing, 5-8-4 and 12 baffles, 5-8-5 and 8 nuts, 5-9.7 guide block assembly, 5-9-1.9 nut, 5-9-2.13 baffle, 5-9-3.7 rolling bearing, 5-9-4.14 baffle, 5-9-5.9 screw, 6.Hydraulic cylinder assembly, 6-1. Hydraulic cylinder, 6-2. Hydraulic cylinder connecting plate, 6-3. Hydraulic cylinder nut. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings:

[0046] See Figures 1 to 5 The force-enhancing device for a material testing machine according to the present invention includes a testing machine measuring shaft assembly 1, a rear sleeve assembly 2, a front sleeve assembly 3, an upper wedge assembly 4, a lower wedge assembly 5, and a hydraulic cylinder assembly 6.

[0047] See Figure 6 The testing machine measuring axis assembly 1 includes a testing machine fixture 1-1, a testing machine measuring axis 1-2, a measuring axis connecting plate 1-3, and a measuring axis nut 1-4;

[0048] The testing machine fixture 1-1 is a YG-T004B manual wedge fixture. The testing machine fixture 1-1 consists of a fixture housing, two wedge-shaped clamps with the same structural dimensions, a fixture handle, and a spring. A wedge-shaped groove is machined in the middle of the fixture housing, with the opening of the groove facing upwards. Two wedge-shaped clamping blocks of the same structural dimensions are symmetrically placed in the wedge-shaped groove of the fixture housing. The inclined surface of one wedge-shaped clamping block contacts the inclined surface of the wedge-shaped groove facing downwards to the right, and the inclined surface of the other wedge-shaped clamping block contacts the inclined surface of the wedge-shaped groove facing downwards to the left. Rectangular semi-grooves are machined horizontally at the lower ends of the two wedge-shaped clamping blocks. A rectangular slider is installed in the rectangular groove formed by the two semi-grooves to ensure the synchronicity of clamping or releasing the sample. The slider can slide horizontally within the groove. Two threaded holes are symmetrically machined on both sides of the wedge-shaped groove on the front surface of the fixture housing. Two horizontally placed baffles are fixed to the front surface of the fixture housing by two screws of the same size as the threaded holes to prevent the wedge-shaped clamping blocks from sliding out of the wedge-shaped groove. A square groove is machined vertically downwards at the bottom of the wedge-shaped groove. Two through holes are symmetrically machined horizontally on the left and right inner sides of the square groove. A through hole is machined in the middle section, aligning the relative positions of the through holes on the left and right inner sides of the square groove and the through hole in the middle section of the clamp handle. The clamp handle is fixed to the clamp housing by a pin. A spring is placed directly below one end of the clamp handle inside the clamp housing, with the spring axis placed vertically. One end of the spring is welded to the bottom surface of the square groove, and the other end is welded to the end face of the clamp handle located inside the clamp housing. The end of the clamp handle located inside the clamp housing is welded to the slider in the groove at the lower end of the wedge-shaped clamp. During the test, the sample is placed in the two wedge-shaped clamps, and the clamp handle is pressed down. Under the push of the clamp handle, the two wedge-shaped clamps move upward and towards each other along the inner wall of the wedge groove, clamping the sample. After the test, the clamp handle is pushed up, and the two wedge-shaped clamps return to the initial position along the inner wall of the wedge groove under the action of the spring force, releasing the sample. The clamp 1-1 of the testing machine should be selected according to the maximum tensile force that the testing machine can provide.

[0049] The testing machine measuring shaft 1-2 is a stepped shaft type non-standard part. The large-diameter end of the testing machine measuring shaft 1-2 is machined with a threaded hole along the axial direction. The rotation axis of the threaded hole is collinear with the rotation axis of the testing machine measuring shaft 1-2. The thread structure is the same as the thread structure on the connecting shaft at the bottom of the testing machine fixture 1-1. The small-diameter end of the testing machine measuring shaft 1-2 is an M10×1 fine-pitch type 1 bolt rod. The rotation axis of the bolt rod is collinear with the rotation axis of the threaded hole. The diameter of the bolt rod should meet the maximum tensile force requirement of the testing machine. The length of the bolt rod should be greater than the sum of the thickness of one side of the measuring shaft connecting plate 1-3 and the thickness of the measuring shaft nut 1-4.

[0050] The measuring axis connecting plate 1-3 is a non-standard part, made from a section of equilateral angle steel with a model of 50*50*10. The width of the section is greater than the side length of the equilateral angle steel. A through hole is machined at the center of one side of the measuring axis connecting plate 1-3, and two through holes are machined on the other side. The two through holes are symmetrically arranged about the short axis of symmetry of the other side. The center distance between the two through holes is greater than twice the diameter of the through hole. The diameter of the through hole is 10mm.

[0051] The aforementioned measuring nuts 1-4 are standard parts, and M10×1 fine thread type 1 connecting nuts are selected.

[0052] When installing the testing machine measuring shaft assembly 1, the testing machine fixture 1-1 is placed vertically with the wedge groove opening facing upwards; the testing machine measuring shaft 1-2 is placed vertically with the threaded hole facing upwards, and the connecting shaft at the lower end of the testing machine fixture 1-1 is inserted into the threaded hole of the testing machine measuring shaft (1-2); the two are connected by threads, and the rotation axis of the connecting shaft in the testing machine fixture 1-1 is collinear with the rotation axis of the testing machine measuring shaft 1-2; the inner arc surface of the measuring shaft connecting plate 1-3 is placed downwards, and the bolt rod of the testing machine measuring shaft 1-2 is inserted into the central through hole on one side of the measuring shaft connecting plate 1-3; the measuring shaft nut 1-4 is threadedly connected to the bolt rod at the end of the testing machine measuring shaft 1-2, thereby fixing the testing machine measuring shaft 1-2 to one side of the measuring shaft connecting plate 1-3.

[0053] See Figure 7 The rear sleeve assembly 2 includes a lower sleeve connecting shaft 2-1, a sleeve block 2-2, a pin 2-3, a lower lever shaft 2-4, four identical M4 fine-thread type 1 nuts 2-5, a lever connecting shaft 2-6, a lever rear bearing 2-7, four identical M4 fine-thread type 1 screws 2-8, an upper lever shaft 2-9, an upper sleeve connecting shaft 2-10, a sleeve block 2-11, and a pin 2-12;

[0054] The lower sleeve connecting shaft 2-1 is a cylindrical straight rod type non-standard part. The length of the lower sleeve connecting shaft 2-1 is 102mm, and the diameter is selected from 10mm to 20mm. In this embodiment, the diameter is selected as 10mm. Two through holes are machined radially at both ends of the lower sleeve connecting shaft 2-1. The diameter of the through holes is 4mm. The axes of the two through holes are parallel, and the distance between the axes of the two through holes and the two end faces of the lower sleeve connecting shaft 2-1 is 10mm.

[0055] The first sleeve block 2-2 is a non-standard cubic part. A through hole with a diameter of 20 mm is machined at the center of symmetry of the 40 mm cube, and the axis of rotation of the through hole is collinear with the center line of symmetry of the cube. A small through hole with a diameter of 4 mm is machined at the center of symmetry of the small cube with a side length of 30 mm, and the axis of rotation of the small through hole is parallel to the axis of rotation of the through hole on the large cube. A blind hole with a diameter of 10 mm and a depth of 15 mm is machined at the center of symmetry of the small cube, and the axis of rotation of the blind hole is perpendicular to the contact surface of the two cubes. The diameter of the blind hole here is the same as the diameter of the lower sleeve connecting shaft 2-1.

[0056] The pins 2-3 mentioned above are standard parts; in this example, a 4×20 type cylindrical pin is selected.

[0057] The first lower lever shaft 2-4 is a non-standard part. The first lower lever shaft 2-4 consists of a lower lever shaft and a lower half bearing seat. The top end of the lower lever shaft is fixedly connected to the bottom end of the lower half bearing seat. The rotation axis of the lower lever shaft is collinear with the vertical symmetry line of the lower half bearing seat. The diameter of the lower lever shaft is selected in the range of (20mm~30mm). In this embodiment, the diameter of the lower lever shaft is 20mm. The diameter of the lower lever shaft is the same as the size of the central through hole of the large cube in the first sleeve block 2-2. The length of the lower lever shaft is 150mm. The lower half bearing seat is a semi-circular ring structure. The two ends of the semi-circular ring structure extend horizontally and symmetrically to both sides with the same side ears. Four screw holes with a diameter of 4mm are uniformly and symmetrically machined on the two side ears of the lower half bearing seat.

[0058] Nuts 2-5 mentioned above are standard parts, and M4 fine thread type 1 nuts are selected;

[0059] The lever coupling 2-6 is a cylindrical straight rod type non-standard part. The diameter of the lever coupling 2-6 is selected from 10mm to 20mm. In this embodiment, the lever coupling 2-6 is selected as an optical shaft with a diameter of 10mm and a length of 200mm.

[0060] The lever rear bearing 2-7 is a standard part, using a 60000 type deep groove ball bearing with an outer diameter of 30mm and an inner diameter of 10mm. In actual applications, a matching lever rear bearing 2-7 should be selected according to the diameter of the lever connecting shaft 2-6.

[0061] The screws 2-8 mentioned above are standard parts, and M4×12 type screws are selected;

[0062] The No. 1 upper lever shaft 2-9 is a non-standard part. The No. 1 upper lever shaft 2-9 is composed of an upper lever shaft and an upper half bearing seat. The bottom end of the upper lever shaft is fixedly connected to the top end of the upper half bearing seat. The rotation axis of the upper lever shaft is collinear with the vertical symmetry line of the upper half bearing seat. The diameter of the upper lever shaft is selected in the range of (20mm~30mm). In this embodiment, the diameter of the upper lever shaft is 20mm. The diameter of the upper lever shaft is the same as the size of the central through hole of the large cube in the No. 2 sleeve block 2-11. The upper half bearing seat is a semi-circular ring structure. The two ends of the semi-circular ring structure extend horizontally and symmetrically to both sides with the same side ears. Four screw holes with a diameter of 4mm are uniformly and symmetrically machined on the two side ears of the upper half bearing seat.

[0063] The upper sleeve connecting shaft 2-10 is a cylindrical straight rod type non-standard part, and the structural dimensions of the upper sleeve connecting shaft 2-10 are the same as those of the lower sleeve connecting shaft 2-1.

[0064] The No. 2 sleeve block 2-11 is a cubic non-standard part, and the structural dimensions of the No. 2 sleeve block 2-11 are the same as those of the No. 1 sleeve block 2-2.

[0065] The pin 2-12 mentioned above is a standard part; in this example, a 4×20 type cylindrical pin is selected.

[0066] When installing the rear sleeve assembly 2, place the No. 1 upper lever shaft 2-9 directly above the No. 1 lower lever shaft 2-4, both vertically positioned, with the upper and lower bearing seats facing each other. Place the lever rear bearing 2-7 inside the bearing seat formed by the upper and lower bearing seats of the No. 1 upper lever shaft 2-9 and the No. 1 lower lever shaft 2-4, and then secure the three together using four No. 1 screws 2-8 and four No. 1 nuts 2-5. Insert the rear end of the lower sleeve connecting shaft 2-1 into the center hole of the small cube on the No. 1 sleeve block 2-2, aligning the relative positions of the pin holes of the two parts. The lower sleeve connecting shaft 2-1 and the first sleeve block 2-2 are fixedly connected using pin 2-3. The upper sleeve connecting shaft 2-10, the second sleeve block 2-11, and the second pin 2-12 are connected in the same way. The lower lever shaft in the lower lever shaft 2-4 is inserted into the center hole on the large cube of the first sleeve block 2-2, and the upper lever shaft in the upper lever shaft 2-9 is inserted into the through hole on the large cube of the second sleeve block 2-11. Finally, the rear end of the lever connecting shaft 2-6 is inserted into the inner ring of the lever rear bearing 2-7, and the rear end of the lever connecting shaft 2-6 protrudes 6.5mm from the inner ring.

[0067] See Figure 7The front sleeve assembly 3 includes a No. 3 pin 3-1, a No. 3 sleeve block 3-2, a No. 2 upper lever shaft 3-3, four No. 2 screws 3-4 with the same structure, a lever front bearing 3-5, four No. 2 nuts 3-6 with the same structure, a No. 2 lower lever shaft 3-7, a No. 4 pin 3-8, and a No. 4 sleeve block 3-9;

[0068] The front sleeve assembly 3 and the rear sleeve assembly 2 have the same structural dimensions. The design and installation of the parts can refer to the relevant content of the rear sleeve assembly 2. It should be noted that the upper sleeve connecting shaft 2-10 should not be inserted into the No. 3 sleeve block 3-2 for the time being, the lower sleeve connecting shaft 2-1 should not be inserted into the No. 4 sleeve block 3-9 for the time being, and the lever connecting shaft 2-6 should not be inserted into the inner ring of the lever front bearing 3-5 for the time being.

[0069] See Figure 6 The upper inclined wedge assembly 4 includes a return spring 4-1, an upper vertical inclined wedge block 4-2, a guide block assembly 1 4-3, a guide block assembly 2 4-4, an upper horizontal rear bearing 4-5, an upper horizontal inclined wedge block 4-6, an upper horizontal front bearing 4-7, an upper guide rail assembly 4-8, and a guide block assembly 3 4-9.

[0070] The return spring 4-1 is a non-standard part. Four compression springs of equal length, with the same stiffness coefficient and circular cross-section are selected. The four compression springs are evenly arranged at the bottom of the upper vertical wedge block 4-2. The top of the spring is welded to the bottom of the upper vertical wedge block 4-2, and the bottom of the spring is fixedly connected to the worktable of the testing machine by welding.

[0071] The aforementioned upper vertical wedge 4-2 is a non-standard part. The upper vertical wedge 4-2 is a wedge composed of an upper vertical front wall, an upper vertical rear wall, an upper vertical left wall, an upper vertical bottom wall, and an upper vertical inclined top wall. The upper vertical front wall and upper vertical rear wall are right-angled triangular walls with identical structures, placed parallel and symmetrically. The upper vertical left wall, upper vertical bottom wall, and upper vertical inclined top wall are rectangular walls of equal width. The left ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical left wall. The bottom ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical bottom wall. The bottom end of the upper vertical left wall is perpendicularly connected to the left end of the upper vertical bottom wall. The top, bottom, front, and rear ends of the upper vertical sloping top wall are connected sequentially to the top of the upper vertical left wall, the right end of the upper vertical bottom wall, the top of the upper vertical front wall, and the top of the upper vertical rear wall. The angle between the right end of the upper vertical bottom wall and the right end of the upper vertical sloping top wall is 30°. The left ends of the upper vertical front wall and upper vertical rear wall of the wedge-shaped triangle are each vertically added... A rectangular groove is machined, with its centerline parallel to the short right-angled sides of the upper vertical front and rear walls of the triangle. A rectangular inclined groove is machined along the length of the upper vertical inclined top wall at its center, with its centerline parallel to the long inclined side of the upper vertical inclined top wall. Two threaded holes are machined at the lower end of the upper vertical left wall, symmetrically arranged along the long axis of symmetry of the upper vertical left wall. In this embodiment, a wedge block with a length of 150mm, a height of 85mm, a thickness of 60mm, and a wedge angle of 30° is selected. A rectangular groove with a depth of 5mm and a width of 9mm is machined on each of the front and rear triangular walls of the wedge block. The distance between the centerline of the rectangular groove and the short right-angled side of the triangle is 23.5mm. The depth of the rectangular inclined groove is 1mm and the width is 9mm. The center distance between the two threaded holes on the upper vertical left wall is 25mm, and the distance from the centerline of the two threaded holes on the upper vertical left wall to the upper vertical bottom wall is 42.5mm.

[0072] The No. 1 guide block assembly 4-3 includes two No. 3 screws 4-3-1, No. 1 baffle 4-3-2, No. 1 rolling bearing 4-3-3, No. 2 baffle 4-3-4, and two No. 3 nuts 4-3-5 with the same structure.

[0073] The aforementioned screw No. 3 4-3-1 is a standard part; in this embodiment, an M4×28 slotted cylindrical head screw is selected.

[0074] The No. 1 baffle 4-3-2 is a non-standard part, made from a section of unequal-sided angle steel with a model number of 35*10*8. The width of the section is greater than the length of the long side of the unequal-sided angle steel. One through hole with a diameter of 8mm and two through holes with a diameter of 4mm are machined on the long side plane of the No. 1 baffle 4-3-2. The center of the 8mm through hole is on the short axis of symmetry of the long side wall, and the distance between the center of the hole and the line of intersection with the vertical plane of the unequal-sided angle steel is 25mm. The centers of the two 4mm through holes are symmetrically arranged above and below the short axis of symmetry of the long side wall. The center distance between the two through holes is 32mm, and the distance between the center of the holes and the line of intersection with the vertical plane of the unequal-sided angle steel is 5mm.

[0075] The No. 1 rolling bearing 4-3-3 is a standard part, and a 60000 type deep groove ball bearing is selected. The outer diameter of the outer ring of the bearing is 30mm, the inner diameter of the inner ring of the bearing is 10mm, the inner ring of the bearing is installed on the No. 1 stepped shaft, the middle section of the No. 1 stepped shaft has a diameter of 10mm and a length of 9mm, and both ends of the No. 1 stepped shaft have a diameter of 8mm and a length of 8mm.

[0076] The structural dimensions of the No. 2 baffle 4-3-4 are the same as those of the No. 1 baffle 4-3-2;

[0077] The aforementioned nut No. 3 4-3-5 is a standard part, and an M4 fine thread type 1 nut is selected;

[0078] When installing guide block assembly 4-3, place baffle 4-3-2 and baffle 4-3-4 symmetrically, aligning the 8mm diameter and two 4mm diameter through holes on baffle 4-3-2 and baffle 4-3-4. Fit rolling bearing 4-3-3 into the middle of stepped shaft 1, with both ends of stepped shaft 1 installed in the 8mm diameter through holes on baffle 4-3-2 and baffle 4-3-4. Insert two identical screws 4-3-1 into the two 4mm diameter through holes on baffle 4-3-2 and baffle 4-3-4, and use two identical nuts 4-3-5 to securely connect the components within guide block assembly 4-3.

[0079] The guide block assembly 4-4 includes four identical screws 4-4-1, a baffle 4-4-2, three identical rolling bearings 4-4-3, a baffle 4-4-4, and four identical nuts 4-4-5.

[0080] The aforementioned screw 4-4-1 is a standard part, and an M4×28 slotted cylindrical head screw is selected.

[0081] The No. 2 rolling bearing 4-4-3 is a standard part, using a 60000 type deep groove ball bearing. The outer diameter of the bearing outer ring is 30mm, and the inner diameter of the bearing inner ring is 10mm. The structural dimensions of the No. 2 stepped shaft are the same as those of the No. 1 stepped shaft in the No. 1 rolling bearing 4-3-3. The No. 2 rolling bearing 4-4-3 is fitted in the middle of the No. 2 stepped shaft.

[0082] The aforementioned nut 4-4-5 is a standard part, and an M4 fine thread type 1 nut is selected.

[0083] The No. 3 baffle 4-4-2 and the No. 4 baffle 4-4-4 have the same structural dimensions and are both non-standard parts. They are made from a section of unequal-sided angle steel with a diameter of 35*10*8, and the width of the cut section is greater than four times the length of the long side of the unequal-sided angle steel. Three through holes with a diameter of 8mm and four through holes with a diameter of 4mm are machined on the long side plane of the No. 3 baffle 4-4-2. The three through holes with a diameter of 8mm are symmetrically arranged about the short axis of symmetry of the long side wall, and the center distance between two adjacent through holes with a diameter of 8mm is 35mm. The through holes with a diameter of 4mm are symmetrically arranged about the short axis of symmetry of the short side wall, and the distance between the center of the 4mm through holes and the outer side wall of the short side wall is 4mm. The center distance between two adjacent through holes with a diameter of 4mm is 24mm.

[0084] When installing guide block assembly 4-4, place baffle 4-4-4 and baffle 3-4-2 symmetrically, so that the three 8mm diameter and four 4mm diameter through holes on baffle 4-4-4 and baffle 3-4-2 are aligned. Install the two ends of the three identical step shafts of No. 2 into the three 8mm diameter through holes on baffle 3-4-2 and baffle 4-4-4. Insert four identical screws 4-4-1 into the 4mm through holes on baffle 4-4-4 and baffle 3-4-2. Use four identical nuts 4-4-5 to fix and connect the parts inside guide block assembly 4-4.

[0085] The aforementioned upper horizontal rear rolling bearings 4-5 are standard parts, selected as 60000 type deep groove ball bearings, with an outer ring outer diameter of 30mm and an inner ring inner diameter of 10mm.

[0086] The aforementioned upper horizontal wedge block 4-6 is a non-standard part. It is a wedge block composed of an upper horizontal front wall, an upper horizontal rear wall, an upper horizontal right wall, an upper horizontal inclined bottom wall, and an upper horizontal top wall. The upper horizontal front wall and upper horizontal rear wall are identical, parallel, and symmetrically placed right-angled triangular walls. The upper horizontal right wall, upper horizontal inclined bottom wall, and upper horizontal top wall are rectangular walls of equal width. The right ends of the upper horizontal front wall and upper horizontal rear wall are perpendicularly connected to the upper horizontal right wall. The right end of the upper horizontal top wall is perpendicularly connected to the top of the upper horizontal right wall. The tops of the upper horizontal front wall and upper horizontal rear wall are perpendicular to the upper horizontal top wall. The upper horizontal right wall is connected to the bottom of the upper horizontal sloping bottom wall. The top, bottom, front, and rear ends of the upper horizontal sloping bottom wall are connected to the left end of the upper horizontal top wall, the bottom end of the upper horizontal right wall, the bottom end of the upper horizontal front wall, and the bottom end of the upper horizontal rear wall in sequence. The angle between the top end of the upper horizontal sloping bottom wall and the left end of the upper horizontal top wall is 30°. A slanted rectangular groove is machined at the center of the upper horizontal sloping bottom wall and along the longitudinal direction of the upper horizontal sloping bottom wall. A rectangular through groove is machined at the center of the upper horizontal top wall and along the longitudinal direction of the upper horizontal top wall. The center lines of the slanted rectangular groove and the rectangular through groove coincide with the long axis of symmetry of the upper horizontal sloping bottom wall and the upper horizontal top wall.

[0087] In this embodiment, a wedge block with a length of 150mm, a height of 85mm, a thickness of 60mm, and a wedge angle of 30° is selected. A countersunk through hole is machined on the front and rear walls of the wedge block triangle. The diameter of the countersunk through hole is 30mm, the depth is 9mm, and the diameter of the through hole is 11mm. The axes of the countersunk through holes are collinear and perpendicular to the front and rear walls of the triangle. A rectangular groove with a depth of 1mm and a width of 9mm is machined at the center of the inclined bottom wall and along the longitudinal direction of the inclined bottom wall. A rectangular through groove with a depth of 1mm and a width of 9mm is machined at the center of the upper horizontal top wall. The centerline of the rectangular through groove coincides with the long axis of symmetry of the upper horizontal top wall.

[0088] The upper horizontal front bearing 4-7 is a standard part, and a deep groove ball bearing with the same structural dimensions as the upper horizontal rear rolling bearing 4-5 is selected.

[0089] See Figure 9 The upper guide rail assembly 4-8 includes 22 identical No. 1 small screws 4-8-1, No. 1 connecting plate 4-8-2, 11 identical No. 1 cylindrical rollers 4-8-3 and No. 2 connecting plate 4-8-4.

[0090] The aforementioned No. 1 small screw 4-8-1 is a standard part, and an M5×8 type standard screw is selected;

[0091] The No. 1 connecting plate 4-8-2 is a non-standard part. Eleven rectangular through holes, each 9×10 mm in size, are machined on a rectangular steel plate with dimensions of 170*40*4 mm. These rectangular through holes are arranged symmetrically along the long and short axes of the rectangular steel plate, with a center-to-center distance of 15 mm between adjacent rectangular through holes. Eleven... right A semi-cylindrical groove with a diameter of 3mm and a length of 18mm is formed. Each pair of semi-cylindrical grooves is connected to a rectangular through hole. The rotation axis of each pair of semi-cylindrical grooves is collinear with the short axis of symmetry of the rectangular through hole. The semi-cylindrical grooves are arranged symmetrically about the long axis of symmetry of the rectangular steel plate. On the other side of the rectangular steel plate, two rows of countersunk holes with a diameter of 8mm, a depth of 2mm, and a through hole diameter of 5mm are machined. The two rows of countersunk holes are arranged symmetrically about the long and short axes of symmetry of the rectangular steel plate. The distance between the countersunk holes and the long axis of symmetry is 19mm. The center distance between adjacent holes in the same row is 15mm. There are eleven countersunk holes in each row.

[0092] The No. 1 cylindrical roller 4-8-3 is a stepped shaft type non-standard part, which is made by machining a straight rod-shaped shaft with a diameter of 10mm and a length of 18mm. At both ends of the straight rod-shaped shaft, thin straight rod shafts with a diameter of 3mm and a length of 4.5mm are machined. The rotation axis of the two thin straight rod shafts is collinear with the rotation axis of the straight rod-shaped shaft.

[0093] The No. 2 connecting plate 4-8-4 is a non-standard part. Eleven rectangular through holes, each 9×10 mm in size, are machined on a rectangular steel plate with dimensions of 170*40*4 mm. The center of symmetry of each rectangular through hole lies on the long axis of symmetry of the rectangular steel plate, and the center-to-center distance between adjacent through holes is 15 mm. Eleven... right A semi-cylindrical groove with a diameter of 3mm and a length of 18mm is formed. Each pair of semi-cylindrical grooves is connected to a rectangular through hole. The rotation axis of each pair of semi-cylindrical grooves is collinear with the short axis of symmetry of the rectangular through hole. The semi-cylindrical grooves are arranged symmetrically about the long axis of symmetry of the rectangular steel plate. Two rows of threaded through holes with a diameter of 5mm are machined on the rectangular steel plate. The two rows of threaded through holes are arranged symmetrically about the long and short axes of symmetry of the rectangular steel plate. The distance between the threaded through holes and the long axis of symmetry is 19mm. The center distance between two adjacent threaded through holes in the same row is 15mm. There are eleven countersunk holes in each row.

[0094] When installing the guide rail assembly 4-8, place the No. 1 connecting plate 4-8-2 and the No. 2 connecting plate 4-8-4 symmetrically, so that the twenty-two 5mm through holes and eleven 9×10 rectangular through holes of the No. 1 connecting plate 4-8-2 and the No. 2 connecting plate 4-8-4 are aligned. Install the No. 1 cylindrical roller 4-8-3 into the rectangular through holes of the No. 1 connecting plate 4-8-2 and the No. 2 connecting plate 4-8-4. Install the thin straight shaft of the No. 1 cylindrical roller 4-8-3 into the cylindrical groove formed by the No. 1 connecting plate 4-8-2 and the No. 2 connecting plate 4-8-4. Fix the parts with the twenty-two No. 1 small screws 4-8-1, and make sure that the head of the No. 1 small screw 4-8-1 does not exceed the surface of the countersunk hole of the No. 1 connecting plate 4-8-2.

[0095] The guide block assembly 4-9 of No. 3 includes nut 4-9-1 of No. 5, baffle 4-9-2 of No. 5, rolling bearing 4-9-3 of No. 3, baffle 4-9-4 of No. 6, and screw 4-9-5 of No. 5;

[0096] The structural dimensions of each part of guide block assembly 4-9 of No. 3 are the same as the structural dimensions of the corresponding parts of guide block assembly 4-3 of No. 1. The manufacturing and installation process of the parts is also the same as that of guide block assembly 4-3 of No. 1.

[0097] When installing the upper wedge assembly 4, the tops of the four return springs of the vertically placed return spring 4-1 and the bottom surface of the upper vertical wedge block 4-2 are evenly and symmetrically arranged in contact, and the two are fixedly connected by welding. The upper guide rail assembly 4-8 is welded to the inclined top wall of the upper vertical wedge block 4-2 through the No. 2 connecting plate 4-8-4. Eleven No. 1 cylindrical rollers 4-8-3 with the same structure are installed in the rectangular groove of the upper vertical inclined top wall. The cylindrical outer surface of the No. 1 cylindrical roller 4-8-3 is not in contact with the bottom surface of the groove. The edge of the upper guide rail assembly 4-8 is aligned with the edge of the inclined top wall of the upper vertical wedge block 4-2.

[0098] Guide block assembly 4-9 (No. 3) and guide block assembly 4-3 (No. 1) are installed on the rectangular grooves on the front and rear walls of the upper vertical wedge block 4-2 via rolling bearing 4-9-3 (No. 3) in guide block assembly 4-9 and rolling bearing 4-3-3 (No. 1) in guide block assembly 4-3, respectively. The outer circumferential surfaces of rolling bearing 4-9-3 (No. 3) and rolling bearing 4-3-3 (No. 1) are in contact with the bottom surface of the rectangular groove.

[0099] The top wall of the upper horizontal wedge block 4-6 is placed horizontally. The upper horizontal wedge block 4-6 is installed on the upper guide rail assembly 4-8. The bottom of the rectangular groove on the inclined bottom wall of the upper horizontal wedge block 4-6 is in contact with the outer cylindrical surface of the 11 identical No. 1 cylindrical rollers 4-8-3. The edge of the inclined bottom wall of the upper horizontal wedge block 4-6 is horizontally aligned with the short side edge of the upper guide rail assembly 4-8.

[0100] Install the upper horizontal front bearing 4-7 and upper horizontal rear bearing 4-5 into the front and rear countersunk holes of the upper horizontal wedge block 4-6; place the No. 2 guide block assembly 4-4 horizontally, and install the No. 2 guide block assembly 4-4 into the rectangular groove on the top wall of the upper horizontal wedge block 4-6 through three identical No. 2 rolling bearings 4-4-3, with the outer circumferential surface of the three identical No. 2 rolling bearings 4-4-3 in contact with the bottom surface of the rectangular groove; the No. 1 guide block assembly 4-3, the No. 2 guide block assembly 4-4 and the No. 3 guide block assembly 4-9 are all welded and fixed to the frame of the testing machine.

[0101] See Figure 8 The lower wedge assembly 5 includes a lower vertical wedge block 5-1, a guide block assembly 5-2 (No. 4), a lower guide rail assembly 5-3, a lower horizontal rear bearing 5-4, a guide block assembly 5-5 (No. 5), a lower horizontal wedge block 5-6, a lower horizontal front bearing 5-7, a guide block assembly 5-8 (No. 6), and a guide block assembly 5-9 (No. 7).

[0102] The lower vertical wedge block 5-1 is a non-standard part. It is a wedge block composed of a lower vertical front wall, a lower vertical rear wall, a lower vertical left wall, a lower vertical bottom wall, a lower vertical top wall, and a lower vertical right oblique wall. The lower vertical front wall and lower vertical rear wall are right-angled trapezoidal walls with identical structures, placed parallel and symmetrically. The lower vertical left wall, lower vertical bottom wall, lower vertical top wall, and lower vertical right oblique wall are rectangular walls of equal width. The lower vertical front wall, lower vertical rear wall, and lower vertical left wall are quadrilateral walls of equal height. The left end is perpendicularly connected to the lower vertical left wall; the bottom ends of the lower vertical front wall and lower vertical rear wall are perpendicularly connected to the lower vertical bottom wall; the bottom end of the lower vertical left wall is perpendicularly connected to the left end of the lower vertical bottom wall; the top ends of the lower vertical front wall, lower vertical rear wall, and lower vertical left wall are perpendicularly connected to the front end, rear end, and left end of the lower vertical top wall in sequence; the top, bottom, front, and rear ends of the lower vertical right inclined wall are connected to the right end of the lower vertical top wall, the right end of the lower vertical bottom wall, the right end of the lower vertical front wall, and the right end of the lower vertical rear wall in sequence; the angle between the right end of the lower vertical top wall and the top end of the lower vertical right inclined wall is 60°.

[0103] In this embodiment, a wedge-shaped block with a lower vertical top wall length of 100mm, a lower vertical bottom wall length of 50mm, a height of 85mm, a thickness of 60mm, and a wedge angle of 60° is selected. A rectangular groove with a depth of 5mm and a width of 9mm is machined on the lower vertical front wall and lower vertical rear wall of the wedge-shaped block, which are both right-angled trapezoidal. The centerline of the rectangular groove is perpendicular to the lower vertical top wall and lower vertical bottom wall of the wedge-shaped block, and the distance between the centerline of the rectangular groove and the lower vertical left wall is 29mm. A rectangular groove is also machined on the lower vertical right wall of the wedge-shaped block. A rectangular groove with a depth of 1 mm and a width of 9 mm is machined in the middle position along the length direction. The center line of the rectangular groove coincides with the long axis of symmetry of the lower vertical right inclined wall. Two threaded holes with a diameter of 10 mm and a depth of 10 mm are machined on the lower vertical left wall of the lower vertical wedge block 5-1, which is perpendicular to the lower vertical bottom wall and the lower vertical top wall. The threaded holes are symmetrically arranged along the long axis of symmetry of the lower vertical left wall. The center distance between the threaded holes is 25 mm, and the distance between the center of the threaded hole and the lower vertical bottom wall is 47 mm.

[0104] The No. 4 guide block assembly 5-2 includes four identical No. 6 screws 5-2-1, a No. 7 baffle 5-2-2, three identical No. 4 rolling bearings 5-2-3, a No. 8 baffle 5-2-4, and four identical No. 6 nuts 5-2-5. The structural dimensions of each part in the No. 4 guide block assembly 5-2 are the same as the corresponding structural dimensions of the parts in the No. 2 guide block assembly 4-4. The manufacturing and installation process of the parts is also the same as the relevant content of the No. 2 guide block assembly 4-4.

[0105] The lower guide rail assembly 5-3 includes five identical No. 2 small screws 5-3-1, No. 3 connecting plate 5-3-2, five identical No. 2 cylindrical rollers 5-3-3 and No. 4 connecting plate 5-3-4.

[0106] The aforementioned No. 2 small screw 5-3-1 is a standard part, and an M5×8 type standard screw is selected;

[0107] The aforementioned connecting plate 5-3-2 (No. 3) is a non-standard part. Five rectangular through holes (9×10 mm) are machined on a rectangular steel plate with dimensions of 85×40×4 mm. These rectangular through holes are arranged symmetrically along the long and short axes of the rectangular steel plate, with a center-to-center distance of 15 mm between adjacent rectangular through holes. Five... rightA semi-cylindrical groove with a diameter of 3mm and a length of 18mm is formed. Each pair of semi-cylindrical grooves is connected to a rectangular through hole. The rotation axis of each pair of semi-cylindrical grooves is collinear with the short symmetry axis of the rectangular through hole. The semi-cylindrical grooves are arranged symmetrically about the long symmetry axis of the rectangular steel plate. Ten countersunk holes with a diameter of 8mm, a depth of 2mm, and a through hole diameter of 5mm are machined on the other side of the rectangular steel plate. The ten countersunk holes are arranged symmetrically about the long and short symmetry axes of the rectangular steel plate. The distance between the countersunk holes and the long symmetry axis is 19mm. The center distance between adjacent holes in the same row is 15mm.

[0108] The No. 2 cylindrical roller 5-3-3 is a stepped shaft type non-standard part. The structural dimensions of the part are the same as those of the No. 1 cylindrical roller 4-8-3. The manufacturing and installation process of the part is also the same as that of the No. 1 cylindrical roller 4-8-3.

[0109] The No. 4 connecting plate 5-3-4 is a non-standard part. Five rectangular through holes with a specification of 9×10 are machined on a rectangular steel plate with a specification of 85×40×4. The center of symmetry of each rectangular through hole is on the long axis of symmetry of the rectangular steel plate, and the center distance between adjacent rectangular through holes is 15mm. Five pairs of semi-cylindrical grooves with a diameter of 3mm and a length of 18mm are machined at both ends of the rectangular through holes on one side of the rectangular steel plate. Each pair of semi-cylindrical grooves is connected to the rectangular through hole. The rotation axis of each pair of semi-cylindrical grooves is collinear with the short axis of symmetry of the rectangular through hole. The semi-cylindrical grooves are symmetrically arranged about the long axis of symmetry of the rectangular steel plate. Ten threaded through holes with a diameter of 5mm are machined on the rectangular steel plate. The threaded through holes are symmetrically arranged about the long and short axes of symmetry of the rectangular steel plate. The distance between the threaded through holes and the long axis of symmetry is 19mm, and the center distance between adjacent threaded through holes in the same row is 15mm.

[0110] When installing the lower guide rail assembly 5-3, place the No. 3 connecting plate 5-3-2 and the No. 4 connecting plate 5-3-4 symmetrically, so that the ten 5mm through holes and five 9×10 rectangular through holes of the No. 3 connecting plate 5-3-2 and the No. 4 connecting plate 5-3-4 are aligned. Install the No. 2 cylindrical roller 5-3-3 into the rectangular through holes of the No. 3 connecting plate 5-3-2 and the No. 4 connecting plate 5-3-4. Install the thin straight shaft of the No. 2 cylindrical roller 5-3-3 into the cylindrical groove formed by the No. 3 connecting plate 5-3-2 and the No. 4 connecting plate 5-3-4 together with ten No. 2 small screws 5-3-1. The No. 3 connecting plate 5-3-2, the No. 2 cylindrical roller 5-3-3 and the No. 4 connecting plate 5-3-4 should be installed and fixed with ten No. 2 small screws 5-3-1. It is required that the head of the No. 2 small screw 5-3-1 does not exceed the surface of the countersunk hole of the No. 3 connecting plate 5-3-2.

[0111] The lower horizontal rear bearing 5-4 is a standard part, using a 60000 type deep groove ball bearing with an outer ring diameter of 30mm and an inner ring diameter of 10mm.

[0112] The No. 5 guide block assembly 5-5 includes two No. 7 screws 5-5-1, No. 9 baffle 5-5-2, No. 5 rolling bearing 5-5-3, No. 10 baffle 5-5-4, and two No. 7 nuts 5-5-5 with the same structure. The dimensions of each part in the No. 5 guide block assembly 5-5 are the same as the structural dimensions of the corresponding parts in the No. 1 guide block assembly 4-3. The manufacturing and installation process of the parts is also the same as the relevant content of the No. 1 guide block assembly 4-3.

[0113] The lower horizontal wedge block 5-6 is a non-standard part. It is a wedge block composed of a lower horizontal front wall, a lower horizontal rear wall, a lower horizontal left oblique wall, a lower horizontal bottom wall, a lower horizontal top wall, and a lower horizontal right wall. The lower horizontal front wall and lower horizontal rear wall are parallel and symmetrically placed right-angled trapezoidal walls with identical structures. The lower horizontal left oblique wall, lower horizontal bottom wall, lower horizontal top wall, and lower horizontal right wall are rectangular walls of equal width. The lower horizontal front wall, lower horizontal rear wall, and lower horizontal right wall are quadrilateral walls of equal height. The right ends of the lower horizontal front wall and lower horizontal rear wall are perpendicularly connected to the lower horizontal right wall. The bottom end of the lower horizontal wall is perpendicularly connected to the bottom wall of the lower horizontal wall. The bottom end of the right wall of the lower horizontal wall is perpendicularly connected to the right end of the lower horizontal wall. The left ends of the front wall, rear wall, top wall, and bottom wall of the lower horizontal wall are connected to the front end, rear end, top end, and bottom end of the left inclined wall of the lower horizontal wall in sequence. The angle between the left end of the bottom wall of the lower horizontal wall and the bottom end of the left inclined wall of the lower horizontal wall is 60°. A countersunk hole is machined on the front wall and rear wall of the lower horizontal wall. Three rectangular grooves are machined at the center of the top wall, bottom wall, and left inclined wall of the lower horizontal wall of the wedge block. The center line of the rectangular grooves coincides with the long axis of symmetry of the top wall, bottom wall, and left inclined wall of the lower horizontal wall, respectively.

[0114] In this embodiment, a wedge block with a bottom horizontal wall length of 100mm, a top horizontal wall length of 50mm, a height of 85mm, a thickness of 60mm, and a wedge angle of 60° is selected. A countersunk hole with a diameter of 30mm, a depth of 9mm, and a through hole diameter of 11mm is machined on the front and rear horizontal walls of the wedge block. The axis of the countersunk hole is perpendicular to the front and rear horizontal walls, and the distance between the axis of the countersunk hole and the top horizontal wall is 42.5mm, and the distance between the axis of the countersunk hole and the right horizontal wall is 29.5mm. Three rectangular grooves with a depth of 1mm and a width of 9mm are machined at the center of the top, bottom, and left horizontal walls of the wedge block. The center lines of the rectangular grooves coincide with the long axis of symmetry of the top, bottom, and left horizontal walls, respectively.

[0115] The lower horizontal front bearings 5-7 are standard parts, using a 60000 type deep groove ball bearing with an outer ring diameter of 30mm and an inner ring diameter of 10mm.

[0116] The No. 6 guide block assembly 5-8 includes four identical No. 8 screws 5-8-1, No. 11 baffle 5-8-2, three identical No. 6 rolling bearings 5-8-3, No. 12 baffle 5-8-4, and four identical No. 8 nuts 5-8-5. The structural dimensions of each part in the No. 6 guide block assembly 5-8 are the same as those of the corresponding parts in the No. 2 guide block assembly 4-4, and the manufacturing and installation process of the parts is also the same as that of the No. 2 guide block assembly 4-4.

[0117] The No. 7 guide block assembly 5-9 includes four identical No. 9 nuts 5-9-1, a No. 13 baffle 5-9-2, three identical No. 7 rolling bearings 5-9-3, a No. 14 baffle 5-9-4, and four identical No. 9 screws 5-9-5. The structural dimensions of each part in the No. 7 guide block assembly 5-9 are the same as those of the corresponding parts in the No. 2 guide block assembly 4-4, and the manufacturing and installation process of the parts is also the same as that of the No. 2 guide block assembly 4-4.

[0118] When installing the lower wedge assembly 5, the lower horizontal top wall and lower horizontal bottom wall of the lower horizontal wedge block 5-6 are placed horizontally, with the lower horizontal left inclined wall facing upwards; the lower horizontal front bearing 5-7 and lower horizontal rear bearing 5-4 are installed in the countersunk holes on the lower horizontal front wall and lower horizontal rear wall of the lower horizontal wedge block 5-6; the No. 4 connecting plate 5-3-4 from the lower guide rail assembly 5-3 is welded to the lower horizontal left inclined wall of the lower horizontal wedge block 5-6, and the No. 2 cylindrical roller 5-3-3 is installed on the lower horizontal wedge block 5-6. In the rectangular groove on the lower horizontal left inclined wall of 6, the cylindrical outer surface of the No. 2 cylindrical roller 5-3-3 is not in contact with the bottom surface of the rectangular groove, and the short side of the lower guide rail assembly 5-3 is aligned with the edge of the lower horizontal left inclined wall; the No. 5 guide block assembly 5-5 and the No. 6 guide block assembly 5-8 are respectively installed in the rectangular grooves on the lower horizontal top wall and the lower horizontal bottom wall of the lower horizontal wedge block 5-6, and the rolling bearing surfaces in the No. 5 guide block assembly 5-5 and the No. 6 guide block assembly 5-8 are in contact with the bottom surface of the rectangular groove;

[0119] The lower vertical wedge block 5-1 has its lower vertical top and bottom walls placed horizontally, with its lower vertical right inclined wall facing downwards. The second cylindrical roller 5-3-3 in the lower guide rail assembly 5-3 is installed in a rectangular groove on the lower vertical right inclined wall. The cylindrical outer surface of the second cylindrical roller 5-3-3 is in contact with the bottom surface of the rectangular groove. The short side of the lower vertical right inclined wall of the lower vertical wedge block 5-1 is horizontally aligned with the short side of the lower guide rail assembly 5-3. One end of the seventh guide block assembly 5-9 and the fourth guide block assembly 5-2 are connected by three identical structural members. The No. 7 rolling bearing 5-9-3 and three identical No. 4 rolling bearings 5-2-3 are installed on the rectangular grooves on the lower vertical front wall and lower vertical rear wall of the lower vertical wedge block 5-1. The outer ring surfaces of the three identical No. 7 rolling bearings 5-9-3 and the three identical No. 4 rolling bearings 5-2-3 are in contact with the bottom surface of the rectangular grooves. The No. 4 guide block assembly 5-2, the No. 5 guide block assembly 5-5, the No. 6 guide block assembly 5-8 and the No. 7 guide block assembly 5-9 are all welded and fixed to the frame of the testing machine.

[0120] See Figure 8 The hydraulic cylinder assembly 6 includes a hydraulic cylinder 6-1, a hydraulic cylinder connecting plate 6-2, and a hydraulic cylinder nut 6-3.

[0121] The hydraulic cylinder 6-1 is a standard part, using a Hanchen servo hydraulic cylinder of model 326. Threads need to be machined at the end of the hydraulic cylinder push rod. As the driving device of the material testing machine, the hydraulic cylinder is already fixed on the base of the testing machine at the factory and is not shown in the view.

[0122] The hydraulic cylinder connecting plate 6-2 and the measuring shaft connecting plate 1-3 have the same structural dimensions, and the parts manufacturing process is also the same as that of the measuring shaft connecting plate 1-3.

[0123] The hydraulic cylinder nut 6-3 is a standard part, and an M10×1 fine thread type 1 connecting nut is selected.

[0124] When installing hydraulic cylinder assembly 6, hydraulic cylinder 6-1 is placed vertically with the hydraulic cylinder push rod facing upwards and the inner arc surface of hydraulic cylinder connecting plate 6-2 facing upwards. The hydraulic cylinder push rod is inserted into the central through hole on one side of hydraulic cylinder connecting plate 6-2, and hydraulic cylinder nut 6-3 is connected to the end of the hydraulic cylinder push rod by thread, thus fixing hydraulic cylinder 6-1 and hydraulic cylinder connecting plate 6-2.

[0125] See Figure 1 The testing machine measuring axis assembly 1 is installed on the upper vertical left wall of the upper vertical wedge block 4-2 in the upper wedge assembly 4 through the measuring axis connecting plate 1-3 and bolted therein. The opening of the testing machine clamp 1-1 faces upward, so as to realize the fixed connection between the testing machine measuring axis assembly 1 and the upper wedge assembly 4.

[0126] Insert the upper sleeve connecting shaft 2-10 into the through hole of the upper horizontal wedge block 4-6, exposing the upper sleeve connecting shaft 2-10 of the upper horizontal wedge block 4-6, and then insert it into the No. 3 sleeve block 3-2. Use the No. 2 pin 2-12 and the No. 3 pin 3-1 to achieve a fixed connection between the upper sleeve connecting shaft 2-10, the No. 2 sleeve block 2-11, the No. 3 sleeve block 3-2 and the upper horizontal wedge block 4-6.

[0127] Insert the lower sleeve connecting shaft 2-1 into the through hole of the lower horizontal wedge block 5-6, and then insert the lower sleeve connecting shaft 2-1, which is exposed, into the No. 4 sleeve block 3-9. Use No. 1 pin 2-3 and No. 4 pin 3-8 to achieve a fixed connection between the lower sleeve connecting shaft 2-1, No. 1 sleeve block 2-2, No. 4 sleeve block 3-9 and the lower horizontal wedge block 5-6.

[0128] Insert the lever coupling 2-6 into the inner ring of the lever front bearing 3-5, with the end of the lever coupling 2-6 protruding 6.5mm from the inner ring of the lever front bearing 3-5.

[0129] The hydraulic cylinder connecting plate 6-2 in the hydraulic cylinder assembly 6 is bolted to the lower vertical left wall of the lower vertical wedge block 5-1 in the lower wedge assembly 5, with the hydraulic cylinder push rod facing upward, so as to achieve a fixed connection between the lower vertical wedge block 5-1 and the hydraulic cylinder assembly 6.

[0130] See Figures 10-13 The force-increasing principle of a force-increasing device for a material testing machine is as follows:

[0131] See Figure 10 For ease of labeling, the lower vertical wedge 5-1, lower horizontal wedge 5-6, upper horizontal wedge 4-6, and upper vertical wedge 4-2 are labeled as wedge a, wedge b, wedge c, and wedge d, respectively. When wedge a moves downward, the force analysis of each wedge is as follows:

[0132] See Figure 11 Force analysis of wedge block a:

[0133]

[0134] Wherein: F ba —The force exerted by wedge b on wedge a; F 导a —The force exerted by the guide block assembly on the wedge block a; F fa —The frictional force of the wedge block a, α—the inclination angle of the lower wedge; F i —Input force; μ—Friction coefficient, taken as μ=0.15;

[0135] Solving equation (1) yields:

[0136]

[0137] Force analysis of wedge block b:

[0138]

[0139] Wherein: F 导b —The force exerted by the guide block assembly on the wedge block b; F ab —The force exerted by wedge a on wedge b; F fb —The frictional force of the wedge block b, F 杆b —The force exerted by the lever assembly on the wedge block b;

[0140] Solving equation (3) yields:

[0141]

[0142] See Figure 12 The dashed line represents a position of the lever's rotation around a fixed point. The effective lever arm of the force always has a multiple relationship. Force analysis is performed on the lever assembly:

[0143] F c杆 =2F b杆 (5)

[0144] Wherein: F c杆 —The force exerted by the wedge block c on the lever assembly; F b杆 —The force F exerted by the wedge block b on the lever assembly b杆 =F 杆b ;

[0145] See Figure 13 Force analysis of wedge block c:

[0146]

[0147] Wherein: F dc —The force exerted by wedge d on wedge c; F 导c —The force exerted by the guide block assembly on the wedge block c; F fc —The frictional force of the wedge block c, β—the inclination angle of the upper wedge; F 杆c —The force exerted by the lever assembly on the wedge block c;

[0148] Solving equation (6) yields:

[0149]

[0150] Force analysis of the wedge block d:

[0151]

[0152] Wherein: F cd —The force exerted by wedge c on wedge d; F0—Output force; F fd—The frictional force of the wedge block d; F 导d —The force exerted by the guide block assembly on the wedge block d;

[0153] Solving equation (8) yields:

[0154]

[0155] Define i F The force amplification factor is the ratio of the output force F0 to the input force F. i The ratio can be obtained from equations (2), (4), (5), (7), and (9):

[0156]

[0157] To achieve a force-boosting effect, the lower wedge inclination angle α in equation (2) is (45°~81.5°), and the upper wedge inclination angle β in equation (7) is (8.5°~45°). Here, to prevent the wedge blocks from sliding against each other and creating self-locking, the inclination angle of the inclined plane should be >8.5°.

[0158] In this example, the lower wedge inclination angle α = 60° and the upper wedge inclination angle β = 30° are selected. Substituting these values ​​into equation (10) yields i. F =6, that is, the hydraulic cylinder input force F i Through the force-enhancing device described in this invention, the output force F0 is increased by 6 times, achieving the effect of force enhancement.

[0159] The above description is merely one selected example of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0160] The working principle of a force-boosting device for a material testing machine is as follows:

[0161] 1. Clamping of the test sample

[0162] Install and secure the force-increasing device, and clamp the test sample in the testing machine fixture 1-1;

[0163] 2. Loading of the test sample

[0164] Hydraulic cylinder 6-1 is activated, and the hydraulic cylinder push rod retracts, causing the lower vertical wedge block 5-1 to move vertically downwards. This, in turn, pushes the lower horizontal wedge block 5-6 to move horizontally to the right via the lower guide rail assembly 5-3. The lower horizontal wedge block 5-6 then drives sleeve block 1 2-2 and sleeve block 4 3-9 to move horizontally to the right, causing the lever assembly to rotate counterclockwise around the lever shaft 2-6. This, in turn, pushes sleeve block 2 2-11 and sleeve block 3-2 to move horizontally to the left. Sleeve block 2 2-11 and sleeve block 3-2 then drive the upper horizontal wedge block 4-6 to move horizontally to the left. This, in turn, pushes the upper vertical wedge block 4-2 to move vertically downwards via the upper guide rail assembly 4-8, thereby causing the testing machine fixture 1-1 to stretch the specimen downwards.

[0165] 3. Resetting of the booster device

[0166] After the test, the hydraulic cylinder was unloaded, the hydraulic cylinder push rod was reset, the lower vertical wedge block 5-1 returned to its initial position, the upper vertical wedge block 4-2 returned to its initial position under the action of the return spring 4-1, and the upper horizontal wedge block 4-6, the lever assembly and the lower horizontal wedge block 5-6 returned to their initial positions under the action of the upper vertical wedge block 4-2.

[0167] See Figure 10 and Figure 14 The motion process of the booster device:

[0168] See Figure 10 and Figure 15 The force transmission process in the booster device:

[0169] Wherein: the lower wedge inclination angle α = 60° and the upper wedge inclination angle β = 30° are selected. The amplification factor of the force of the lower wedge assembly can be obtained from equations (2) and (4), and the output force is increased. The amplification factor of the lever component force can be obtained from equation (5), and the output force increases by 2 times; the amplification factor of the upper wedge component force can be obtained from equations (7) and (9), and the output force increases by 10 times. The force amplification factor of the entire force amplification device can be obtained by equation (10), and the output force is increased by 6 times.

[0170] This operating method is illustrated using the tensile static load test of a material testing machine as an example. The device is also applicable to the compressive static load test of a material testing machine, but the relative positions of each wedge and component need to be adjusted.

Claims

1. A force-boosting device for a material testing machine, characterized in that, The force-enhancing device for a material testing machine includes a testing machine measuring shaft assembly (1), a rear sleeve assembly (2), a front sleeve assembly (3), an upper wedge assembly (4), a lower wedge assembly (5), and a hydraulic cylinder assembly (6). The upper wedge assembly (4) is located directly above the lower wedge assembly (5). The testing machine measuring axis assembly (1) is installed on the upper vertical left wall of the upper vertical wedge block (4-2) in the upper wedge assembly (4) through the measuring axis connecting plate (1-3) and bolted thereon. The hydraulic cylinder assembly (6) is installed on the lower vertical left wall of the lower vertical wedge block (5-1) in the lower wedge assembly (5) through the hydraulic cylinder connecting plate (6-2) and bolted thereon. The rear sleeve assembly (2) and the front sleeve assembly (3) are vertically and symmetrically installed on the front and rear sides of the upper wedge assembly (4) and the lower wedge assembly (5). The top end of the rear sleeve assembly (2) is inserted into the through hole of the upper horizontal wedge block (4-6) in the upper wedge assembly (4) through the upper sleeve connecting shaft (2-10). The upper sleeve connecting shaft (2-10) of the upper horizontal wedge block (4-6) is then inserted into the top end of the front sleeve assembly (3). The front and rear ends of the upper sleeve connecting shaft (2-10) are fixedly connected to the top ends of the rear sleeve assembly (2) and the front sleeve assembly (3). The middle section of the upper sleeve connecting shaft (2-10) is rotatably connected to the upper horizontal wedge block (4-6). The bottom end of the rear sleeve assembly (2) is inserted into the through hole of the lower horizontal wedge block (5-6) in the lower wedge assembly (5) through the lower sleeve connecting shaft (2-1). The lower sleeve connecting shaft (2-1) of the lower horizontal wedge block (5-6) is then inserted into the bottom end of the front sleeve assembly (3). The front and rear ends of the lower sleeve connecting shaft (2-1) are fixedly connected to the bottom ends of the rear sleeve assembly (2) and the front sleeve assembly (3). The middle section of the lower sleeve connecting shaft (2-1) is rotatably connected to the lower horizontal wedge block (5-6). The middle end of the rear sleeve assembly (2) is inserted into the middle end of the front sleeve assembly (3) through the lever connecting shaft (2-6) therein. The front and rear ends of the lever connecting shaft (2-6) and the middle ends of the rear sleeve assembly (2) and the front sleeve assembly (3) are rotatably connected.

2. A force-increasing device for a material testing machine according to claim 1, characterized in that, The testing machine measuring shaft assembly (1) includes a testing machine fixture (1-1), a testing machine measuring shaft (1-2), a measuring shaft connecting plate (1-3), and a measuring shaft nut (1-4); The testing machine fixture (1-1) mentioned above is a YG-T004B manual wedge fixture; The testing machine measuring shaft (1-2) is a stepped shaft type non-standard part. The large-diameter end of the testing machine measuring shaft (1-2) is machined with a threaded hole along the axial direction. The rotation axis of the threaded hole is collinear with the rotation axis of the testing machine measuring shaft (1-2). The thread structure is the same as the thread structure on the connecting shaft at the bottom of the testing machine fixture (1-1). The small-diameter end of the testing machine measuring shaft (1-2) is a bolt rod. The rotation axis of the bolt rod is collinear with the rotation axis of the threaded hole. The length of the bolt rod should be greater than the sum of the thickness of one side of the measuring shaft connecting plate (1-3) and the thickness of the measuring shaft nut (1-4). The aforementioned measuring axis connecting plate (1-3) is a non-standard part, made from a section of equilateral angle steel with a model of 50*50*10. The width of the section is greater than the side length of the equilateral angle steel. A through hole is machined at the center of one side of the measuring axis connecting plate (1-3), and two through holes with the same structure are machined on the other side. The two through holes are symmetrically arranged about the short axis of symmetry of the other side, and the center distance between the two through holes is greater than twice the diameter of the through hole. The testing machine fixture (1-1) is placed vertically with the wedge groove opening facing upwards; the testing machine measuring shaft (1-2) is placed vertically with the threaded hole facing upwards; the connecting shaft at the lower end of the testing machine fixture (1-1) is inserted into the threaded hole of the testing machine measuring shaft (1-2), and the two are connected by threads; the rotation axis of the connecting shaft in the testing machine fixture (1-1) is collinear with the rotation axis of the testing machine measuring shaft (1-2); the inner arc surface of the measuring shaft connecting plate (1-3) is placed downwards; the bolt rod of the testing machine measuring shaft (1-2) is inserted into the central through hole on one side of the measuring shaft connecting plate (1-3); the measuring shaft nut (1-4) is fitted on the bolt rod, fixing the testing machine measuring shaft (1-2) to one side of the measuring shaft connecting plate (1-3).

3. A force-increasing device for a material testing machine according to claim 1, characterized in that, The rear sleeve assembly (2) includes a lower sleeve connecting shaft (2-1), a sleeve block (2-2), a pin (2-3), a lower lever shaft (2-4), a lever connecting shaft (2-6), a lever rear bearing (2-7), an upper lever shaft (2-9), an upper sleeve connecting shaft (2-10), a sleeve block (2-11), and a pin (2-12); The No. 1 upper lever shaft (2-9) is placed directly above the No. 1 lower lever shaft (2-4), both vertically positioned. The upper bearing seat in the No. 1 upper lever shaft (2-9) is positioned opposite the lower bearing seat in the No. 1 lower lever shaft (2-4). The lever rear bearing (2-7) is placed inside the bearing seat formed by the upper and lower bearing seats, and the three are fixedly connected by screws and nuts. The rear end of the lower sleeve connecting shaft (2-1) is inserted into the center hole of the small cube on the No. 1 sleeve block (2-2), and the lower sleeve connecting shaft (2-1) and the No. 1 sleeve block are connected by the No. 1 pin (2-3). (2-2) Fixed connection, the connection method between the upper sleeve connecting shaft (2-10), the No. 2 sleeve block (2-11) and the No. 2 pin shaft (2-12) is similar; insert the lower lever shaft of the No. 1 lower lever shaft (2-4) into the center hole on the large cube of the No. 1 sleeve block (2-2), insert the upper lever shaft of the No. 1 upper lever shaft (2-9) into the through hole on the large cube of the No. 2 sleeve block (2-11); finally, insert the rear end of the lever connecting shaft (2-6) into the inner ring of the lever rear bearing (2-7), and make the rear end of the lever connecting shaft (2-6) protrude from the inner ring of the lever rear bearing (2-7).

4. A force-increasing device for a material testing machine according to claim 1, characterized in that, The upper wedge assembly (4) includes a return spring (4-1), an upper vertical wedge block (4-2), a guide block assembly (4-3), a guide block assembly (4-4), an upper horizontal rear bearing (4-5), an upper horizontal wedge block (4-6), an upper horizontal front bearing (4-7), an upper guide rail assembly (4-8), and a guide block assembly (4-9). The top of the vertically placed return spring (4-1) and the bottom surface of the upper vertical wedge block (4-2) are evenly and symmetrically arranged in contact. The top of the return spring (4-1) and the bottom surface of the upper vertical wedge block (4-2) are fixedly connected by welding. The upper guide rail assembly (4-8) is welded to the inclined top wall of the upper vertical wedge block (4-2) through the No. 2 connecting plate (4-8-4). The edge of the upper guide rail assembly (4-8) is aligned with the edge of the inclined top wall of the upper vertical wedge block (4-2). The No. 3 guide block assembly (4-9) and the No. 1 guide block assembly (4-3) are respectively mounted on the rectangular grooves on the front and rear walls of the upper vertical wedge block (4-2) through the No. 3 rolling bearing (4-9-3) and the No. 1 rolling bearing (4-3-3) therein. The outer circumferential surfaces of the No. 3 rolling bearing (4-9-3) and the No. 1 rolling bearing (4-3-3) are respectively in contact with the bottom surface of the rectangular groove. The upper horizontal wedge block (4-6) is mounted on the upper guide rail assembly (4-8). The bottom surface of the rectangular groove on the inclined bottom wall of the upper horizontal wedge block (4-6) is in contact with the outer cylindrical surface of the No. 1 cylindrical roller (4-8-3) in the upper guide rail assembly (4-8). The short edge of the inclined bottom wall of the upper horizontal wedge block (4-6) is horizontally aligned with the short edge of the upper guide rail assembly (4-8). The upper horizontal front bearing (4-7) and upper horizontal rear bearing (4-5) are installed in the countersunk holes on the front and rear walls of the upper horizontal wedge block (4-6); the No. 2 guide block assembly (4-4) is installed on the rectangular groove on the top wall of the upper horizontal wedge block (4-6) through three identical No. 2 rolling bearings (4-4-3), and the outer circumferential surfaces of the three identical No. 2 rolling bearings (4-4-3) are in contact with the bottom surface of the rectangular groove; the other ends of the No. 1 guide block assembly (4-3), the No. 2 guide block assembly (4-4), and the No. 3 guide block assembly (4-9) are all welded and fixedly connected to the frame of the testing machine.

5. A force-increasing device for a material testing machine according to claim 4, characterized in that, The No. 2 guide block assembly (4-4) includes a No. 3 baffle (4-4-2), three No. 2 rolling bearings (4-4-3) with identical structures, and a No. 4 baffle (4-4-4). The No. 2 rolling bearing (4-4-3) is a 60000 type deep groove ball bearing. The No. 2 rolling bearing (4-4-3) is fitted in the middle of the No. 2 stepped shaft. The two ends of the No. 2 stepped shaft have the same diameter, and the diameter of the three through holes on the No. 3 baffle (4-4-2) and the No. 4 baffle (4-4-4) is the same. The diameter of the middle part of the No. 2 stepped shaft is the same as the inner ring diameter of the No. 2 rolling bearing (4-4-3). The baffles No. 3 (4-4-2) and No. 4 (4-4-4) are structurally identical parts. They are made from two 150mm long pieces of unequal-sided angle steel with dimensions of 35×10×8. Three large-diameter through holes and four small-diameter through holes of identical structure are machined on the long side of the angle steel. The three large-diameter through holes are symmetrically arranged about the short axis of symmetry of the long side, with a center distance of 25mm from the outer wall of the short side and a center distance of 35mm between adjacent large-diameter through holes. The small-diameter through holes are also symmetrically arranged about the short axis of symmetry of the short side, with a center distance of 45mm from the outer wall of the short side and a center distance of 24mm between adjacent small-diameter through holes. The rotation axes of the three large-diameter through holes and the four small-diameter through holes are parallel. Baffle No. 4 (4-4-4) and baffle No. 3 (4-4-2) are placed symmetrically, so that the three large-diameter through holes and four small-diameter through holes on baffle No. 4 (4-4-4) and baffle No. 3 (4-4-2) are aligned. Three identical rolling bearings No. 2 (4-4-3) are fitted in the middle of three identical stepped shafts No.

2. The two ends of the three identical stepped shafts No. 2 are installed in the three large-diameter through holes on baffle No. 4 (4-4-4) and baffle No. 3 (4-4-2) and baffle No. 4 (4-4-4) are fixedly connected by four identical screws and nuts.

6. A force-increasing device for a material testing machine according to claim 1, characterized in that, The lower wedge assembly (5) includes a lower vertical wedge block (5-1), a guide block assembly (5-2), a lower guide rail assembly (5-3), a lower horizontal rear bearing (5-4), a guide block assembly (5-5), a lower horizontal wedge block (5-6), a lower horizontal front bearing (5-7), a guide block assembly (5-8), and a guide block assembly (5-9). The lower horizontal wedge block (5-6) has its lower horizontal top wall and lower horizontal bottom wall placed horizontally. The lower horizontal front bearing (5-7) and lower horizontal rear bearing (5-4) are installed in the countersunk holes on the lower horizontal front wall and lower horizontal rear wall of the lower horizontal wedge block (5-6). The lower guide rail assembly (5-3) is installed on the lower horizontal left inclined wall of the lower horizontal wedge block (5-6) through its No. 4 connecting plate (5-3-4). The cylindrical outer surface of the No. 2 cylindrical roller (5-3-3) in the lower guide rail assembly (5-3) is not in contact with the bottom of the rectangular groove on the lower horizontal left inclined wall. The short side of the lower guide rail assembly (5-3) is aligned with the top and bottom edges of the lower horizontal left inclined wall; one end of the guide block assembly (5-5) and the guide block assembly (5-8) are respectively mounted on the rectangular grooves on the lower horizontal top wall and lower horizontal bottom wall of the lower horizontal wedge block (5-6) through the rolling bearing (5-5-3) and three identical rolling bearings (5-8-3) of the latter. The outer ring surfaces of the rolling bearing (5-5-3) and the three identical rolling bearings (5-8-3) of the latter are in contact with the bottom of the rectangular groove. The lower vertical wedge block (5-1) is mounted on the lower guide rail assembly (5-3). The rectangular groove bottom on the lower vertical right inclined wall of the lower vertical wedge block (5-1) is in contact with the surface of the No. 2 cylindrical roller (5-3-3) in the lower guide rail assembly (5-3). The short side of the lower vertical right inclined wall of the lower vertical wedge block (5-1) is horizontally aligned with the short side of the lower guide rail assembly (5-3). One end of the No. 7 guide block assembly (5-9) and the No. 4 guide block assembly (5-2) is connected by three identical No. 7 rolling bearings (5-9-3). Three identical No. 4 rolling bearings (5-2-3) are installed on the rectangular grooves on the lower vertical front wall and lower vertical rear wall of the lower vertical wedge block (5-1). The outer ring surfaces of three identical No. 7 rolling bearings (5-9-3) and three identical No. 4 rolling bearings (5-2-3) are in contact with the bottom of the rectangular grooves. The other ends of the No. 4 guide block assembly (5-2), No. 5 guide block assembly (5-5), No. 6 guide block assembly (5-8), and No. 7 guide block assembly (5-9) are all welded and fixed to the frame of the testing machine.

7. A force-increasing device for a material testing machine according to claim 1, characterized in that, The upper vertical wedge (4-2) is a wedge composed of an upper vertical front wall, an upper vertical rear wall, an upper vertical left wall, an upper vertical bottom wall, and an upper vertical inclined top wall. The upper vertical front wall and upper vertical rear wall are right-angled triangular walls with identical structures, placed parallel and symmetrically. The upper vertical left wall, upper vertical bottom wall, and upper vertical inclined top wall are rectangular walls of equal width. The left ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical left wall. The bottom ends of the upper vertical front wall and upper vertical rear wall are perpendicularly connected to the upper vertical bottom wall. The bottom end of the upper vertical left wall is perpendicularly connected to the left end of the upper vertical bottom wall. The top, bottom, front, and rear ends of the upper vertical inclined top wall are arranged in sequence. It connects to the top of the upper vertical left wall, the right end of the upper vertical bottom wall, the top of the upper vertical front wall, and the top of the upper vertical rear wall. The angle between the right end of the upper vertical bottom wall and the right end of the upper vertical sloping top wall is 30°. A rectangular groove is vertically set at the left end of the upper vertical front wall and the upper vertical rear wall. The center line of the rectangular groove is parallel to the short right-angled side of the upper vertical front wall and the upper vertical rear wall. A rectangular sloping groove is set at the center of the upper vertical sloping top wall along the length of the upper vertical sloping top wall. The center line of the rectangular sloping groove is parallel to the long sloping side of the upper vertical sloping top wall. Two threaded holes are machined at the lower end of the upper vertical left wall. The threaded holes are symmetrically arranged along the long axis of symmetry of the upper vertical left wall.

8. A force-increasing device for a material testing machine according to claim 1, characterized in that, The upper horizontal wedge (4-6) is a wedge composed of an upper horizontal front wall, an upper horizontal rear wall, an upper horizontal right wall, an upper horizontal bottom wall, and an upper horizontal top wall. The upper horizontal front wall and upper horizontal rear wall are right-angled triangular walls with identical structures, placed parallel and symmetrically. The upper horizontal right wall, upper horizontal bottom wall, and upper horizontal top wall are rectangular walls of equal width. The right ends of the upper horizontal front wall and upper horizontal rear wall are perpendicularly connected to the upper horizontal right wall. The right end of the upper horizontal top wall is perpendicularly connected to the top of the upper horizontal right wall. The tops of the upper horizontal front wall and upper horizontal rear wall are perpendicularly connected to the upper horizontal top wall. The bottom end of the upper horizontal right wall is connected to the bottom end of the upper horizontal bottom wall. Next, the top, bottom, front, and rear ends of the upper horizontal sloping bottom wall are connected to the left end of the upper horizontal top wall, the bottom end of the upper horizontal right wall, the bottom end of the upper horizontal front wall, and the bottom end of the upper horizontal rear wall in sequence. The angle between the top end of the upper horizontal sloping bottom wall and the left end of the upper horizontal top wall is 30°. A sloping rectangular groove is machined at the center of the sloping bottom wall and along the longitudinal direction of the sloping bottom wall. A rectangular through groove is machined at the center of the upper horizontal top wall. The center lines of the sloping rectangular groove and the rectangular through groove coincide with the long axis of symmetry of the sloping bottom wall and the upper horizontal top wall. A countersunk through hole is machined on the upper horizontal front wall and the upper horizontal rear wall. The rotation axis of the countersunk through hole is collinear and perpendicular to the upper horizontal front wall and the upper horizontal rear wall.

9. A force-increasing device for a material testing machine according to claim 1, characterized in that, The lower vertical wedge (5-1) is a wedge composed of a lower vertical front wall, a lower vertical rear wall, a lower vertical left wall, a lower vertical bottom wall, a lower vertical top wall, and a lower vertical right wedge. The lower vertical front wall and lower vertical rear wall are right-angled trapezoidal walls with identical structures, placed parallel and symmetrically. The lower vertical left wall, lower vertical bottom wall, lower vertical top wall, and lower vertical right wedge are rectangular walls of equal width. The lower vertical front wall, lower vertical rear wall, and lower vertical left wall are quadrilateral walls of equal height. The left ends of the lower vertical front wall and lower vertical rear wall are perpendicularly connected to the lower vertical left wall. The bottom ends of the lower vertical front wall and lower vertical rear wall are perpendicularly connected to the lower vertical bottom wall. The bottom end of the lower vertical left wall is perpendicularly connected to the left end of the lower vertical bottom wall. The top of the vertical left wall is perpendicularly connected to the front, rear, and left ends of the lower vertical top wall in sequence. The top, bottom, front, and rear ends of the lower vertical right inclined wall are connected to the right ends of the lower vertical top wall, the lower vertical bottom wall, the lower vertical front wall, and the lower vertical rear wall in sequence. The angle between the right end of the lower vertical top wall and the top of the lower vertical right inclined wall is 60°. A rectangular groove is machined on the lower vertical front wall and the lower vertical rear wall, with the center line of the rectangular groove perpendicular to the lower vertical top wall and the lower vertical bottom wall of the wedge block. A rectangular groove is machined in the middle of the lower vertical right inclined wall of the wedge block along its length, with the center line of the rectangular groove coinciding with the long axis of symmetry of the lower vertical right inclined wall. Two threaded holes are machined on the lower vertical left wall, and the threaded holes are symmetrically arranged along the long axis of symmetry of the lower vertical left wall.

10. A force-increasing device for a material testing machine according to claim 1, characterized in that, The lower horizontal wedge (5-6) is a wedge composed of a lower horizontal front wall, a lower horizontal rear wall, a lower horizontal left oblique wall, a lower horizontal bottom wall, a lower horizontal top wall, and a lower horizontal right wall. The lower horizontal front wall and lower horizontal rear wall are right-angled trapezoidal walls with identical structures, placed parallel and symmetrically. The lower horizontal left oblique wall, lower horizontal bottom wall, lower horizontal top wall, and lower horizontal right wall are rectangular walls of equal width. The lower horizontal front wall, lower horizontal rear wall, and lower horizontal right wall are quadrilateral walls of equal height. The right ends of the lower horizontal front wall and lower horizontal rear wall are perpendicularly connected to the lower horizontal right wall. The bottom ends of the lower horizontal front wall and lower horizontal rear wall are connected to the lower horizontal right wall. The horizontal bottom wall is vertically connected, and the bottom end of the lower horizontal right wall is vertically connected to the right end of the lower horizontal bottom wall. The left ends of the lower horizontal front wall, lower horizontal rear wall, lower horizontal top wall, and lower horizontal bottom wall are connected to the front end, rear end, top end, and bottom end of the lower horizontal left inclined wall in sequence. The angle between the left end of the lower horizontal bottom wall and the bottom end of the lower horizontal left inclined wall is 60°. A countersunk hole is machined on the lower horizontal front wall and lower horizontal rear wall. Three rectangular grooves are machined at the center of the lower horizontal top wall, lower horizontal bottom wall, and lower horizontal left inclined wall. The center line of the rectangular grooves coincides with the long axis of symmetry of the lower horizontal top wall, lower horizontal bottom wall, and lower horizontal left inclined wall, respectively.

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