Self-weight balance integrated fixture for hoisting and loading fixture

Abstract

The invention belongs to the technical field of structural strength tests, and particularly relates to a hoisting and loading fixture self-weight balance integrated fixture which comprises a loading actuator, a screw assembly, an outer support, a loading fixture, a connecting rod and an adjusting mechanism. The adjusting mechanism comprises a connecting assembly, a left side balance weight and a right side balance weight. Levers are always in a horizontal state by independently adjusting the balance force of the levers on the two sides of the actuator. The problems that due to the fact that an actuator loading clamp is unbalanced, a lever freely falls, rotates and is stacked, and an actuator is stressed, rotates and deviates, an actuator sensor is subjected to longitudinal and transverse force through composite stacking rotation, changes are complex, uncontrolled actions are prone to being caused, and danger is generated are avoided. And meanwhile, the balancing device belongs to a loading clamp of the loading channel, is integrated with the loading clamp and can synchronously move along with the loading channel, so that the movement change of the loading channel of a large test with hundreds of loading channels is simplified.

Description

Technical Field

[0001] The present application belongs to the technical field of structural strength testing, and in particular relates to a self-weight balancing integrated clamp for a hoisting loading clamp. Background Art

[0002] In the structural strength test, there are many loading channels located on the upper surface of the test piece, and most of them are concentrated step by step by the loading fixture at multiple points on the test piece, and then loaded by an actuator. The most typical method is to load through a multi-stage lever centralized method.

[0003] The loading fixtures such as the loading lever are hoisted under the actuator. Different loads at both ends of the lever are achieved through different lever ratios. The loading force transmission point in the middle of the lever is not in the middle of the lever. The weights on both sides of the loading force transmission point in the middle of the lever are inconsistent. Some of the differences are particularly large, which makes the lever unable to be in a horizontal state all the time. Figure 1 , Figure 2 The imbalance on both sides of the actuator also causes the actuator to tilt significantly. The resulting compound lever stacking and rotation causes the actuator sensor to be subjected to longitudinal and lateral forces, and the changes are complex, which can easily cause uncontrolled movements and create dangers. At the same time, after the load is unloaded, the actuator piston rod also extends outward, causing all the multi-stage levers to naturally droop, push and overlap each other. If the levers are hooked on each other, there will be great hidden dangers in the next test. Multiple lever loading channels are adjacent. Due to the obvious tilt of the actuator, all the multi-stage levers naturally droop, push and overlap each other. The levers of multiple different loading channels are hooked on each other, interfering with each other. Loading is no longer possible in the next test, and there is a great risk of damage.

[0004] The current treatment method is to keep different loading channels at a distance to prevent the levers from being entangled, to move slowly during unloading and primary loading and to check at any time, and to manually handle the actuator when it moves slowly to ensure that the levers do not hook up with each other. However, this method requires the levers to be straightened out before each test, and the test personnel need to manually handle the levers when the actuator moves slowly to ensure that the levers do not hook up with each other. This leads to slow loading, and personnel handling the levers during loading, which brings personnel risks. If the levers are not handled in time, they will hang on each other, and there is still a risk of damage during loading.

[0005] Therefore, how to reduce the risk of damage when handling unbalanced actuators is a problem that needs to be solved. Summary of the invention

[0006] The purpose of the present application is to provide a self-weight balancing integrated clamp for a hoisting loading clamp, so as to solve the problem that the existing handling of the actuator is prone to the risk of damage when the actuator is unbalanced.

[0007] The technical solution of the present application is: a self-weight balancing integrated fixture for a hoisting loading fixture, comprising a loading actuator, a screw assembly, an outer bracket, a loading fixture, a connecting rod and an adjusting mechanism; the outer bracket and the test piece are both arranged on the ground, the outer bracket is an inverted U-shaped structure, a crossbeam is arranged on the top of the outer bracket, and the test piece is arranged at the opening position of the outer bracket; the loading actuator is inverted above the test piece, the actuator tailstock at the tail of the loading actuator is connected to the screw assembly, the top of the screw assembly is connected to the crossbeam, and the piston rod of the loading actuator is connected to the loading fixture; the connecting rod is connected between the loading fixture and the test piece;

[0008] The adjusting mechanism is arranged on both sides of the loading fixture, and the adjusting mechanism includes a connecting assembly, a left counterweight and a right counterweight; the connecting assembly is connected to the actuator tailstock of the loading actuator, the left counterweight and the right counterweight are respectively arranged on both sides of the loading actuator, and the left counterweight and the right counterweight are both connected to the connecting assembly; the left counterweight and the right counterweight can both adjust the counterweight; the loading fixture includes a primary lever and a secondary lever, one side of the secondary lever is hinged to the piston rod of the loading actuator, and the other side is hinged to the side wall of the primary lever, and the length of the secondary lever is greater than the length of the primary lever.

[0009] Preferably, the connecting rod comprises a primary connecting rod and a cross-stage connecting rod; one end of the primary connecting rod is hinged to the test piece and the other end is hinged to the primary lever; one end of the cross-stage connecting rod is hinged to the test piece and the other end is hinged to the secondary lever.

[0010] Preferably, it also includes a test piece loading ring, which is fixed on the test piece, the first-level lever is connected to the test piece loading ring through a first-level connecting rod, and the second-level lever is connected to the test piece loading ring through a cross-level connecting rod.

[0011] Preferably, the connecting assembly includes a balancing bracket, a pulley assembly and an adjusting steel cable; a first central hole threadedly matched with the screw assembly is opened in the middle of the balancing bracket, there are two groups of pulley assemblies and they are respectively connected to the two ends of the balancing bracket, there are two groups of adjusting steel cables and the two groups of adjusting steel cables pass through the two groups of pulley assemblies respectively, and among the two groups of adjusting steel cables, one end of one group of adjusting steel cables is connected to the first end of the secondary lever, and the other end is connected to the left counterweight; one end of the other group of adjusting steel cables is connected to the second end of the secondary lever, and the other end is connected to the right counterweight.

[0012] Preferably, a card plate seat assembly is provided at the first end of the secondary lever, and the card plate seat assembly is connected to the adjusting steel cable corresponding to the first end of the second lever; a fixing bolt is provided at the second end of the secondary lever, and the fixing bolt is connected to the adjusting steel cable corresponding to the second end of the second lever.

[0013] Preferably, the balancing bracket includes a bracket body, a first center hole is opened in the middle of the bracket body, waist-shaped holes are opened on both sides of the bracket body, and a connecting nut is provided on the screw assembly. By tightening the connecting nut, the balancing bracket is fixed to the screw assembly, and the waist-shaped hole is used to connect the pulley assembly.

[0014] Preferably, the pulley assembly includes a fixed pulley, a pulley seat, a pulley shaft and a bolt assembly; one end of the bolt assembly is connected to the pulley seat, and the other end is connected to the waist-shaped hole; the pulley shaft is fixed to the bottom of the pulley seat, and the fixed pulley is arranged in the pulley seat and rollingly cooperates with the pulley shaft.

[0015] Preferably, the adjustment steel cable includes a steel cable body, a sleeve end and a threaded end; the sleeve end and the threaded end are respectively arranged at both ends of the steel cable body, the threaded end can be connected to the left counterweight or the right counterweight, and the sleeve end can be connected to the clamping plate seat assembly or the fixing bolt.

[0016] Preferably, the card plate seat assembly includes two ears, a long bolt and nut assembly, an upper card plate, a lower card plate and a steel cable bolt and nut assembly; the upper card plate and the lower card plate are correspondingly arranged up and down and are used to clamp the upper and lower sides of the secondary lever, and the long bolt and nut assembly is connected between the upper card plate and the lower card plate to connect and fix the upper card plate and the lower card plate; the two ears are fixed to the upper card plate, and the steel cable bolt and nut assembly is connected to the two ears, and the middle part of the steel cable bolt and nut assembly is connected to the sleeve end of the adjusting steel cable to realize the connection between the adjusting steel cable and the card plate seat assembly.

[0017] Preferably, the secondary lever is composed of two symmetrically arranged channel steels, a connecting groove is formed between the two channel steels, and the upper clamping plate and the lower clamping plate are respectively arranged on the upper and lower sides of the connecting groove.

[0018] Preferably, the left-side counterweight includes a chassis, a second threaded rod, an open counterweight and a hexagonal long nut; the second threaded rod is vertically arranged and integrally connected to the chassis, there are multiple open counterweights and they are placed on the bottom plate, and the number of open counterweights is determined according to actual needs. The hexagonal long nut is threadedly connected to the top of the second threaded rod to fix the open counterweight.

[0019] Preferably, a single ear is provided on the secondary lever, and the single ear includes an ear body and a first threaded rod; the ear body is integrally connected to the first threaded rod, and the ear body can be directly screwed into the piston rod of the loading actuator. A long rectangular hole groove is opened in the ear body. When the actuator piston rod is fully extended, the pin shaft of the loading actuator is located in the middle of the long rectangular hole groove.

[0020] The self-weight balancing integrated fixture of the hoisting loading fixture of the present application has the following advantages:

[0021] 1) The loading fixture is integrated with the loading channel itself, and can be moved freely with the loading point of the channel actuator. It does not require a separate space, does not need to be installed separately, and does not occupy other loading space positions, making the movement and change of the loading channel of large-scale tests with hundreds of loading channels simple. It saves time and manpower, saves high-altitude installation work, and is safer;

[0022] 2) Solve practical problems: The imbalance of the actuator loading fixture causes the lever to fall freely, rotate and accumulate. The actuator is also forced to rotate and deviate. The complex accumulation and rotation causes the actuator sensor to be subjected to longitudinal and lateral forces, and the changes are complex, which can easily cause uncontrolled movements and create dangers;

[0023] 3) Flexible and wide adaptability: The balancing force of the levers on both sides can be adjusted separately. If the weight of the lever changes or the lever ratio changes, the balancing device can flexibly adjust the balancing force of the levers on both sides to adapt to various changes. Moreover, since the load spectrum does not need to consider the weight of the lever group, the loading load is accurate, the loading is simpler and more accurate, and errors are reduced.

[0024] 4) Easy to move and balance, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0026] Figure 1 Loading lever tilt axis side schematic diagram for this application;

[0027] Figure 2 Loading lever tilt plane schematic for this application;

[0028] Figure 3 This is a schematic diagram of multi-channel lever interferometry for this application;

[0029] Figure 4 This is a schematic diagram of the axial side structure of the balancing device of this application;

[0030] Figure 5 This is a front view schematic diagram of the balancing device structure of this application;

[0031] Figure 6 This is a partial structural diagram of the balancing device of this application;

[0032] Figure 7 A schematic diagram of the balancing bracket for this application;

[0033] Figure 8 This is a schematic diagram of the pulley assembly for this application;

[0034] Fig. 9 Schematic diagram of adjusting the cable structure for this application;

[0035] Fig.10 This is a schematic diagram of the pallet seat assembly and the adjustment cable for this application;

[0036] Fig.11 This is a diagram of the left side counterweight for this application;

[0037] Fig.12 This is a schematic diagram of a single ear for this application.

[0038] 1. Test piece; 2. Loading actuator; 3. Screw assembly; 4. Crossbeam; 5-1. Primary lever; 5-2. Secondary lever; 6-1. Primary connecting rod; 6-2. Cross-level connecting rod; 7. Test piece loading ring; 8. Clamp seat assembly; 8-1. Double ears; 8-2. Long bolt and nut assembly; 8-3. Upper clamp; 8-4. Lower clamp; 8-5. Cable bolt and nut assembly; 9. Adjusting cable; 9-1. Cable body; 9-2. Sleeve end; 9-3. Threaded end; 10. Left counterweight; 10-1. Chassis; 10-2. Second Threaded rod; 10-3, open counterweight; 10-4, long hexagonal nut; 11, pulley assembly; 11-1, fixed pulley; 11-2, pulley seat; 11-3, pulley shaft; 11-4, bolt assembly; 12, balance bracket; 12-1, bracket body; 12-2, waist-shaped hole; 12-3, first center hole; 13, right-side counterweight; 14, single ear; 14-1, ear body; 14-2, first threaded rod; 14-3, long rectangular hole groove; 15, connecting plate; 16, fixing bolt; 17, pin shaft; 18, nut; 19, actuator tailstock. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The utility model discloses a self-weight balancing integrated fixture for a hoisting loading fixture, which is arranged on the fixture of an actuator itself, and the balancing force of levers on both sides of the actuator can be adjusted separately to keep the levers in a horizontal state at all times.

[0041] like Figure 1-Figure 5, including a loading actuator 2, a screw assembly 3, an outer bracket, a loading fixture, a connecting rod and an adjustment mechanism. The outer bracket and the test piece 1 are both set on the ground. The outer bracket is an inverted U-shaped structure. A crossbeam 4 is provided on the top of the outer bracket. The test piece 1 is set at the opening position of the outer bracket. The loading actuator 2 is inverted above the test piece 1. The actuator tailstock 19 at the tail of the loading actuator 2 is connected to the screw assembly 3. The top of the screw assembly 3 is connected to the crossbeam 4. The piston rod of the loading actuator 2 is connected to the loading fixture; the connecting rod is connected between the loading fixture and the test piece 1.

[0042] The loading fixture includes a primary lever 5-1 and a secondary lever 5-2. One side of the secondary lever 5-2 is hinged to the piston rod of the loading actuator 2, and the other side is hinged to the side wall of the primary lever 5-1. The length of the secondary lever 5-2 is greater than that of the primary lever 5-1.

[0043] The connecting rod includes a primary connecting rod 6-1 and a cross-stage connecting rod 6-2; one end of the primary connecting rod 6-1 is hinged to the test piece 1, and the other end is hinged to the primary lever 5-1; one end of the cross-stage connecting rod 6-2 is hinged to the test piece 1, and the other end is hinged to the secondary lever 5-2.

[0044] like Figure 6 The adjustment mechanism is arranged on both sides of the loading fixture, and the adjustment mechanism includes a connecting assembly, a left counterweight 10 and a right counterweight 13. The connecting assembly is connected to the actuator tailstock 19 of the loading actuator 2, and the left counterweight 10 and the right counterweight 13 are respectively arranged on both sides of the loading actuator 2, and the left counterweight 10 and the right counterweight 13 are both connected to the connecting assembly. The left counterweight 10 and the right counterweight 13 can both adjust the counterweight.

[0045] During the loading process, by controlling the length of the piston rods of the two groups of loading actuators 2, the primary lever 5-1 and the secondary lever 5-2 are driven to deflect, thereby applying different loads to the test piece 1. When an imbalance occurs on both sides of the loading actuator 2, the weight of the left counterweight 10 or the right counterweight 13 is adjusted until the balance is achieved on both sides of the loading actuator 2.

[0046] By adjusting the balancing force of the levers on both sides of the actuator separately, the levers are always in a horizontal state. This prevents the actuator loading fixture from being unbalanced, causing the levers to freely fall, rotate and accumulate, and the actuator to deviate from the force rotation. The resulting composite accumulation rotation causes the actuator sensor to be subjected to longitudinal and lateral forces, and the changes are complex, which can easily cause uncontrolled movements and create dangers. At the same time, the balancing device belongs to the loading fixture of the loading channel itself, is integrated with the loading fixture, and can move synchronously with the loading channel, simplifying the movement and change of the loading channel in large-scale tests with hundreds of loading channels.

[0047] Preferably, it also includes a loading ring of the test piece 1, which is fixed on the test piece 1, the first-level lever 5-1 is connected to the loading ring of the test piece 1 through the first-level connecting rod 6-1, and the second-level lever 5-2 is connected to the loading ring of the test piece 1 through the cross-level connecting rod 6-2, and the connection is stable.

[0048] Preferably, the connection assembly includes a balance bracket 12, a pulley assembly 11 and an adjustment cable 9. A first central hole 12-3 threadedly matched with the screw assembly 3 is provided in the middle of the balance bracket 12, two groups of pulley assemblies 11 are respectively connected to the two ends of the balance bracket 12, two groups of adjustment cables 9 are respectively passed through the two groups of pulley assemblies 11, and one end of one group of adjustment cables 9 is connected to the first end of the secondary lever 5-2 and the other end is connected to the left counterweight 10; one end of the other group of adjustment cables 9 is connected to the second end of the secondary lever 5-2 and the other end is connected to the right counterweight 13.

[0049] The two sides of the secondary lever 5-2 have different lever ratios and different lever connectors, resulting in a large weight difference between the two sides. The left counterweight 10 and the right counterweight 13 correspond to and balance the different weights on the left and right sides of the secondary lever 5-2, respectively.

[0050] Preferably, the first end of the secondary lever 5-2 is provided with a card seat assembly 8, and the card seat assembly 8 is connected to the adjusting steel cable 9 corresponding to the first end of the second lever; the second end of the secondary lever 5-2 is provided with a fixing bolt 16, and the fixing bolt 16 is connected to the adjusting steel cable 9 corresponding to the second end of the second lever.

[0051] like Figure 7 Preferably, the balancing bracket 12 includes a bracket body 12-1, a first center hole 12-3 is opened in the middle of the bracket body 12-1, waist-shaped holes 12-2 are opened on both sides of the bracket body 12-1, and a connecting nut 18 is provided on the screw assembly 3. By tightening the connecting nut 18, the balancing bracket 12 is fixed to the screw assembly 3, and the waist-shaped hole 12-2 is used to connect the pulley assembly 11.

[0052] The weight balance on both sides of the balance bracket 12 is also borne by the actuator tailstock 19 and the screw assembly 3, and does not need to be borne by a separate structure outside the screw assembly 3, such as other fixed beams 4. In other words, the balance device belongs to the loading fixture of the loading channel itself, and belongs to the self-balancing device of the loading fixture of the channel itself, and can move synchronously with the loading channel. In the structural strength test, the loading channel often moves due to different test load conditions. The balance device can move synchronously with it, which greatly facilitates the change of the loading channel. For large-scale tests with hundreds of loading channels, the workload of the loading channel movement and change is amazing. The integration of the balance device greatly reduces the test workload.

[0053] like Figure 8Preferably, the pulley assembly 11 includes a fixed pulley 11-1, a pulley seat 11-2, a pulley shaft 11-3 and a bolt assembly 11-4. One end of the bolt assembly 11-4 is connected to the pulley seat 11-2, and the other end is connected to the waist-shaped hole 12-2, and when the bolt is loosened, it can be moved in the waist-shaped hole 12-2 to adjust the position; the pulley shaft 11-3 is fixed to the bottom of the pulley seat 11-2, and the fixed pulley 11-1 is arranged in the pulley seat 11-2 and rollingly cooperates with the pulley shaft 11-3. When replacing a different secondary lever 5-2, when the inclination angle of the adjusting cable 9 needs to be adjusted, the position of the pulley assembly 11 can be moved to meet different inclination angle requirements of the adjusting cable 9.

[0054] like Fig. 9 Preferably, the adjusting cable 9 comprises a cable body 9-1, a sleeve end 9-2 and a threaded end 9-3. The sleeve end 9-2 and the threaded end 9-3 are respectively arranged at both ends of the cable body 9-1, the threaded end 9-3 can be connected to the left counterweight 10 or the right counterweight 13, and the sleeve end 9-2 can be connected to the card seat assembly 8 or the fixing bolt 16.

[0055] like Fig.10 Preferably, the card seat assembly 8 includes two ears 8-1, a long bolt and nut 18 assembly 8-2, an upper card plate 8-3, a lower card plate 8-4 and a wire bolt and nut 18 assembly 8-5. The upper card plate 8-3 and the lower card plate 8-4 are arranged correspondingly up and down and are used to clamp the upper and lower sides of the secondary lever 5-2. The long bolt and nut 18 assembly 8-2 is connected between the upper card plate 8-3 and the lower card plate 8-4 to connect and fix the upper card plate 8-3 and the lower card plate 8-4; the two ears 8-1 are fixed to the upper card plate 8-3, the wire bolt and nut 18 assembly 8-5 is connected in the two ears 8-1, and the middle part of the wire bolt and nut 18 assembly 8-5 is connected to the sleeve end 9-2 of the adjusting wire rope 9, so as to realize the connection between the adjusting wire rope 9 and the card seat assembly 8.

[0056] Preferably, the secondary lever 5-2 is composed of two symmetrically arranged channel steels, and a connecting groove is formed between the two channel steels. The upper clamping plate 8-3 and the lower clamping plate 8-4 are respectively arranged on the upper and lower sides of the connecting groove. By loosening the long bolt and nut 18 assembly 8-2, the clamping plate seat assembly 8 can be freely moved and fixed along the connecting groove.

[0057] like Fig.11 Preferably, the left counterweight 10 includes a chassis 10-1, a second threaded rod 10-2, an open counterweight 10-3 and a hexagonal long nut 1810-4. The second threaded rod 10-2 is vertically arranged and integrally connected to the chassis 10-1. There are a plurality of open counterweights 10-3 placed on the bottom plate. The number of open counterweights 10-3 is determined according to actual needs. The hexagonal long nut 1810-4 is threadedly connected to the top of the second threaded rod 10-2 to fix the open counterweight 10-3.

[0058] The right counterweight 13 has the same structure as the left counterweight 10 and will not be described in detail.

[0059] like Fig.12 Preferably, a single ear 14 is provided on the secondary lever 5-2, and the single ear 14 includes an ear body 14-1 and a first threaded rod 14-2. The ear body 14-1 is integrally connected with the first threaded rod 14-2, and the ear body 14-1 can be directly screwed into the piston rod of the loading actuator 2. A long rectangular hole 14-3 is provided in the ear body 14-1. When the actuator piston rod is fully extended, the pin 17 of the loading actuator 2 is in the middle of the long rectangular hole 14-3, which can ensure that the secondary lever 5-2 does not bear the external force of the actuator piston rod end.

[0060] In summary, this application has the following advantages:

[0061] 1) The loading fixture is integrated with the loading channel itself, and can be moved freely with the loading point of the channel actuator. It does not require a separate space, does not need to be installed separately, and does not occupy other loading space positions, making the movement and change of the loading channel of large-scale tests with hundreds of loading channels simple. It saves time and manpower, saves high-altitude installation work, and is safer;

[0062] 2) Solve practical problems: The imbalance of the actuator loading fixture causes the lever to fall freely, rotate and accumulate. The actuator is also forced to rotate and deviate. The complex accumulation and rotation causes the actuator sensor to be subjected to longitudinal and lateral forces, and the changes are complex, which can easily cause uncontrolled movements and create dangers;

[0063] 3) Flexible and wide adaptability: The balancing force of the levers on both sides can be adjusted separately. If the weight of the lever changes or the lever ratio changes, the balancing device can flexibly adjust the balancing force of the levers on both sides to adapt to various changes. Moreover, since the load spectrum does not need to consider the weight of the lever group, the loading load is accurate, the loading is simpler and more accurate, and errors are reduced.

[0064] 4) Easy to move and balance, greatly improving work efficiency.

[0065] Finally, it should be noted that: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0066] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-weight balancing integrated fixture for hoisting and loading fixture, characterized in that: The invention comprises a loading actuator (2), a screw assembly (3), an external bracket, a loading fixture, a connecting rod and an adjusting mechanism; the external bracket and the test piece (1) are both arranged on the ground, the external bracket is an inverted U-shaped structure, a crossbeam (4) is arranged on the top of the external bracket, and the test piece (1) is arranged at the opening position of the external bracket; the loading actuator (2) is inverted above the test piece (1), the actuator tailstock (19) at the tail of the loading actuator (2) is connected to the screw assembly (3), the top of the screw assembly (3) is connected to the crossbeam (4), and the piston rod of the loading actuator (2) is connected to the loading fixture; the connecting rod is connected between the loading fixture and the test piece (1); The adjustment mechanism is arranged on both sides of the loading fixture, and the adjustment mechanism comprises a connecting assembly, a left counterweight (10) and a right counterweight (13); the connecting assembly is connected to an actuator tailstock (19) of a loading actuator (2), the left counterweight (10) and the right counterweight (13) are respectively arranged on both sides of the loading actuator (2), and both the left counterweight (10) and the right counterweight (13) are connected to the connecting assembly; both the left counterweight (10) and the right counterweight (13) can adjust the counterweight; the loading fixture comprises a primary lever (5-1) and a secondary lever (5-2), one side of the secondary lever (5-2) is hinged to a piston rod of the loading actuator (2), and the other side is hinged to a side wall of the primary lever (5-1), and the length of the secondary lever (5-2) is greater than the length of the primary lever (5-1).

2. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 1, characterized in that: The connecting rod comprises a primary connecting rod (6-1) and a cross-stage connecting rod (6-2); one end of the primary connecting rod (6-1) is hinged to the test piece (1), and the other end is hinged to the primary lever (5-1); one end of the cross-stage connecting rod (6-2) is hinged to the test piece (1), and the other end is hinged to the secondary lever (5-2).

3. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 1, characterized in that: It also includes a test piece (1) loading ring, which is fixed on the test piece (1), the first-level lever (5-1) is connected to the test piece (1) loading ring via a first-level connecting rod (6-1), and the second-level lever (5-2) is connected to the test piece (1) loading ring via a cross-level connecting rod (6-2).

4. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 1, characterized in that: The connecting assembly comprises a balancing bracket (12), a pulley assembly (11) and an adjusting steel cable (9); a first central hole (12-3) threadedly matched with the screw assembly (3) is opened in the middle of the balancing bracket (12); there are two groups of pulley assemblies (11) respectively connected to the two ends of the balancing bracket (12); there are two groups of adjusting steel cables (9) and the two groups of adjusting steel cables (9) pass through the two groups of pulley assemblies (11) respectively; one end of one group of adjusting steel cables (9) is connected to the first end of the secondary lever (5-2) and the other end is connected to the left counterweight (10); one end of the other group of adjusting steel cables (9) is connected to the second end of the secondary lever (5-2) and the other end is connected to the right counterweight (13).

5. The self-weight balancing integrated fixture for hoisting and loading fixture as claimed in claim 4, characterized in that: The first end of the secondary lever (5-2) is provided with a card seat assembly (8), and the card seat assembly (8) is connected to the adjustment steel cable (9) corresponding to the first end of the second lever; the second end of the secondary lever (5-2) is provided with a fixing bolt (16), and the fixing bolt (16) is connected to the adjustment steel cable (9) corresponding to the second end of the second lever.

6. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 4, characterized in that: The balancing bracket (12) comprises a bracket body (12-1), a first central hole (12-3) is opened in the middle of the bracket body (12-1), waist-shaped holes (12-2) are opened on both sides of the bracket body (12-1), a connecting nut (18) is provided on the screw assembly (3), and the balancing bracket (12) is fixed to the screw assembly (3) by tightening the connecting nut (18), and the waist-shaped hole (12-2) is used to connect the pulley assembly (11).

7. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 4, characterized in that: The pulley assembly (11) comprises a fixed pulley (11-1), a pulley seat (11-2), a pulley shaft (11-3) and a bolt assembly (11-4); one end of the bolt assembly (11-4) is connected to the pulley seat (11-2), and the other end is connected to the waist-shaped hole (12-2); the pulley shaft (11-3) is fixed to the bottom of the pulley seat (11-2), and the fixed pulley (11-1) is arranged in the pulley seat (11-2) and rollingly matched with the pulley shaft (11-3).

8. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 5, characterized in that: The adjusting steel cable (9) comprises a steel cable body (9-1), a sleeve end (9-2) and a threaded end (9-3); the sleeve end (9-2) and the threaded end (9-3) are respectively arranged at two ends of the steel cable body (9-1); the threaded end (9-3) can be connected to the left counterweight (10) or the right counterweight (13); and the sleeve end (9-2) can be connected to a clamping plate seat assembly (8) or a fixing bolt (16).

9. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 5, characterized in that: The card seat assembly (8) comprises two ears (8-1), a long bolt and nut (18) assembly (8-2), an upper card plate (8-3), a lower card plate (8-4) and a steel cable bolt and nut (18) assembly (8-5); the upper card plate (8-3) and the lower card plate (8-4) are arranged correspondingly up and down and are used to clamp the upper and lower sides of the secondary lever (5-2); the long bolt and nut (18) assembly (8-2) is connected between the upper card plate (8-3) and the lower card plate (8-4) to connect and fix the upper card plate (8-3) and the lower card plate (8-4); the two ears (8-1) are fixed to the upper card plate (8-3); the steel cable bolt and nut (18) assembly (8-5) is connected inside the two ears (8-1); the middle part of the steel cable bolt and nut (18) assembly (8-5) is connected to the sleeve end (9-2) of the adjusting steel cable (9) to realize the connection between the adjusting steel cable (9) and the card seat assembly (8).

10. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 9, characterized in that: The secondary lever (5-2) is composed of two symmetrically arranged channel steels, a connecting groove is formed between the two channel steels, and an upper clamping plate (8-3) and a lower clamping plate (8-4) are respectively arranged on the upper and lower sides of the connecting groove.

11. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 4, characterized in that: The left-side counterweight (10) comprises a chassis (10-1), a second threaded rod (10-2), an open counterweight (10-3) and a hexagonal long nut (18) (10-4); the second threaded rod (10-2) is vertically arranged and integrally connected to the chassis (10-1); there are a plurality of open counterweights (10-3) and they are placed on the bottom plate; the number of the open counterweights (10-3) is determined according to actual needs; the hexagonal long nut (18) (10-4) is threadedly connected to the top of the second threaded rod (10-2) to fix the open counterweight (10-3).

12. The self-weight balancing integrated fixture for hoisting and loading fixture according to claim 4, characterized in that: A single ear (14) is provided on the secondary lever (5-2), and the single ear (14) comprises an ear body (14-1) and a first threaded rod (14-2); the ear body (14-1) is integrally connected with the first threaded rod (14-2), and the ear body (14-1) can be directly screwed into the piston rod of the loading actuator (2); a long rectangular hole groove (14-3) is provided in the ear body (14-1), and when the actuator piston rod is fully extended, the pin shaft (17) of the loading actuator (2) is located in the middle of the long rectangular hole groove (14-3).

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