A convenient dismounting device for impact blade of pendulum impact testing machine

Abstract

The application discloses a kind of impact blade convenient dismounting device of pendulum impact testing machine, including blade, knife bar, loading and unloading component, stable component, shockproof component and alarm component, the lower portion of the knife bar is equipped with block, the knife bar is fixedly connected with mounting ring on, the knife bar is fixedly connected with blade by mounting ring.The application is inserted into block by stable component when inserting block, rotating knob is twisted to make protruding portion rotate in round groove, at this time, the ball on mounting cylinder is rolled on the inner wall above round groove under spring pressure, when it is rolled to fixed groove, under the spring resilience, mounting cylinder and ball are inserted into fixed groove, and the inner wall of fixed groove is formed with clamping cooperation, the circumferential rotating position of protruding portion is limited.At this time, protruding portion cannot continue to rotate in round groove, ensure that protruding portion always maintains with the locking state of the dislocation of through groove, and the stability after installation is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pendulum impact testing machine, and particularly relates to a convenient dismounting device for an impact blade of a pendulum impact testing machine. BACKGROUND

[0002] The pendulum impact testing machine is a detection device for measuring the impact resistance of metal materials under dynamic load, and is widely used in the material quality detection link in the fields of mechanical manufacturing and metallurgy. The impact blade, as a core component of the pendulum impact testing machine, directly acts on the sample, and the installation precision and connection stability of the impact blade are crucial to the accuracy of the test data.

[0003] In the prior art, the dismounting structure of the impact blade of the pendulum impact testing machine mainly includes three types. The first type is a bolt fastening structure, the impact blade is fixedly installed on the blade rod through a plurality of bolts, and when dismounting, special tools such as wrenches and screwdrivers are needed to tighten or loosen the bolts in sequence to complete the fixing or dismounting of the blade. The second type is a welded fixed structure, the impact blade and the blade rod are permanently connected by welding, and the structure does not need to consider the dismounting operation, and the connection strength of the blade and the blade rod is ensured by the welding effect.

[0004] However, the bolt fastening method needs to use special tools such as wrenches and screwdrivers to complete the dismounting, the operation process is complicated, and under the action of long-term impact vibration, the bolts are prone to looseness or thread slipping. Although the welded fixed structure can ensure the stability of the connection, the impact blade cannot be dismounted and replaced, and when the blade is worn or damaged, the blade rod assembly needs to be replaced as a whole, which greatly increases the use cost of the equipment.

[0005] Therefore, the present application provides a convenient dismounting device for an impact blade of a pendulum impact testing machine. SUMMARY

[0006] The present application aims at solving the problems in the prior art and provides a convenient dismounting device for an impact blade of a pendulum impact testing machine.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0008] A convenient dismounting device for an impact blade of a pendulum impact testing machine, comprising a blade, a blade rod, a mounting and dismounting assembly, a stabilizing assembly, a shockproof assembly and an alarm assembly, wherein the lower part of the blade rod is provided with a block, the blade rod is fixedly connected with a mounting ring, and the blade rod is fixedly connected with the blade through the mounting ring.

[0009] The mounting and dismounting assembly is used for mounting or dismounting the blade rod.

[0010] The stabilizing assembly is used for enhancing the stability of the installation of the blade rod.

[0011] The shockproof assembly is used for avoiding loosening of the blade and the blade rod during impact test

[0012] The alarm assembly is used for alarming when the blade rod loosens.

[0013] Preferably, the mounting and dismounting assembly comprises a plug-in block, a through slot, a plug-in column, a circular groove and two protruding parts; the plug-in block is fixedly connected below the blade rod, the through slot is arranged on the block, and the circular groove is connected with the through slot.

[0014] Preferably, the block and the plug-in block are respectively provided with a clamping gap on two sides, the plug-in block is respectively provided with a curved part on two sides, the two protruding parts are respectively arranged on two sides of the upper end of the plug-in column, the plug-in column is plugged into the through slot, and the two protruding parts can rotate in the circular groove.

[0015] Preferably, the stabilizing assembly comprises two rolling balls, two mounting barrels, two sliding grooves, two springs and two fixing grooves; the two sliding grooves are respectively arranged on the two protruding parts, and the two mounting barrels are respectively slidably connected to the two sliding grooves.

[0016] Preferably, the two fixing grooves are respectively arranged on the plug-in block, the two rolling balls are respectively movably connected to the two mounting barrels, one end of the two springs is respectively fixedly connected to the two mounting barrels, and the other end is respectively fixedly connected to the inner wall of the two sliding grooves, and the mounting barrel is slidably connected to the fixing groove.

[0017] Preferably, the shockproof assembly comprises a threaded area, a sleeve, a compression ring, two connecting blocks and two rubber blocks; the threaded area is arranged on the blade rod, the compression ring is rotatably connected to the sleeve, the two connecting blocks are respectively fixedly connected to the compression ring, and the two rubber blocks are respectively slidably connected to the two groups of sliding rails.

[0018] Preferably, the sleeve is provided with a first thread, the sleeve is provided with an internal thread, the compression ring is provided with a screw group, the compression ring is fixedly connected to the two rubber blocks through the screw group, the rubber block is tightly attached to the clamping gap between the plug-in block and the block, and the sleeve is slidably connected to the threaded area.

[0019] Preferably, the alarm assembly comprises two mounting grooves, two contact blocks and two sensors, the two contact blocks are respectively fixedly connected to two sides of the plug-in block, and the two mounting grooves are respectively arranged on two sides of the block.

[0020] Preferably, the two sensors are respectively fixedly installed in the two mounting grooves, and a gap is left between the contact block and the sensor.

[0021] Preferably, a knob is rotatably connected below the block, the knob is fixedly connected with the inserting column, the knob is provided with second lines, one side of the rubber block is arc surface, and the block is used for fixedly installing on the pendulum shaft of the pendulum impact testing machine.

[0022] The present application has the following advantages:

[0023] I. By means of the assembling and disassembling assembly, the inserting column is inserted into the through slot in the inserting block after the inserting block on the cutter bar is inserted into the block, when the protruding part on the inserting column abuts against the circular groove, the two protruding parts are synchronously rotated in the circular groove by the knob, at this time, the protruding part is away from the alignment position corresponding to the through slot, and instead, forms a limiting fit with the inner wall of the circular groove, the protruding part after rotation is blocked by the step structure of the circular groove and cannot be axially taken out along the through slot, so that the cutter bar is stably fixed on the block; when disassembling, the knob is reversely rotated to drive the protruding part to return to the initial position aligned with the through slot, at this time, the protruding part is no longer blocked by the step of the circular groove, and the inserting column can be taken out from the through slot by pulling it upward, then the inserting block can be taken out from the block, and the disassembling of the cutter bar is completed, so that the convenience and reliability of the impact blade disassembling process are improved.

[0024] II. By means of the stabilizing assembly, when the inserting block is inserted into the block, the protruding part is rotated in the circular groove by screwing the knob, at this time, the ball on the mounting cylinder rolls on the inner wall above the circular groove under the spring pressure, when it rolls to the fixed groove, the mounting cylinder and the ball are inserted into the fixed groove under the spring rebound force, and form a clamping fit with the inner wall of the fixed groove, so as to limit the circumferential rotating position of the protruding part. At this time, the protruding part cannot continue to rotate in the circular groove, and the locking state of the protruding part always keeping misaligned with the through slot is ensured, and the stability after installation is enhanced.

[0025] III. By means of the shockproof assembly, after the inserting block is inserted into the block, the rotating sleeve is rotated to make it slide downward along the threaded area, drive the pressing ring and the connecting block to move, and make the rubber block gradually inserted into the gap between the inserting block and the block, the assembly looseness between the two is eliminated by the filling and extrusion of the rubber block, when the impact test is carried out, the rubber block can absorb vibration energy by its elastic deformation, so as to avoid the cutter bar from loosening in the long-term impact test, and ensure the stability and accuracy of the test.

[0026] IV. By means of the alarm assembly, if the cutter bar loosens, the inserting block will shake with the cutter bar, so as to drive the contact block close to the sensor, after the contact block contacts with the sensor, the sensor triggers an alarm signal to make the alarm system alarm, the gap between the contact block and the sensor is arranged to ensure that the sensor will not be mistakenly triggered in the normal installation state of the cutter bar, so as to ensure the accuracy of the alarm signal, avoid the impact test from failing or the equipment from being damaged due to the cutter bar loosening not being found in time, and improve the safety and reliability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The overall structure diagram of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0028] Figure 2 The overall structure diagram of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure. Figure 1 The enlarged schematic view of A in the figure.

[0029] Figure 3 The internal section view of the plug-in block of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0030] Figure 4 The internal section view of the plug-in block of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0031] Figure 5 The transverse section view of the plug-in block of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0032] Figure 6 The internal section view of the plug-in block of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0033] Figure 7 The internal section view of the plug-in block of the impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0034] Figure 8 The impact blade convenient dismounting device of the pendulum impact testing machine is shown in the figure.

[0035] In the figure: 1, blade; 2, blade rod; 3, block; 4, threaded area; 5, installation groove; 6, sleeve; 7, knob; 8, compression ring; 9, connecting block; 10, rubber block; 11, sliding rail; 12, plug-in block; 13, sensor; 14, contact block; 15, through groove; 16, round groove; 17, plug-in column; 18, protruding part; 19, installation cylinder; 20, ball; 21, spring; 22, fixed groove; 23, sliding groove; 24, installation ring; 25, internal thread; 26, screw group; 27, clamping gap; 28, first thread; 29, second thread; 30, curved surface part. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0037] Embodiment one:

[0038] Referring to Figures 1 to 5 and Figure 8The utility model provides a kind of impact blade convenient dismounting device of pendulum impact testing machine, including blade 1, blade bar 2, mounting and dismounting component, stable component, shockproof component and alarm component, blade bar 2 is fixedly connected with mounting ring 24, blade bar 2 is fixedly connected with blade 1 by mounting ring 24, and blade bar 2 below is equipped with block 3;

[0039] Mounting and dismounting component is used to mount or dismount blade bar 2;

[0040] Stable component is used to enhance the stability of blade bar 2 installation;

[0041] Shockproof component is used to avoid the loosening of blade 1 and blade bar 2 during impact test.

[0042] Alarm component is used to alarm when blade bar 2 loosens.

[0043] Mounting and dismounting component includes plug-in block 12, through slot 15, plug-in post 17, circular groove 16 and two protruding portions 18;Plug-in block 12 is equipped with slide rail 11 on both sides respectively, slide rail 11 is used to provide sliding guide for other components, to ensure that its movement trajectory is accurate, plug-in block 12 is fixedly connected below blade bar 2, and is used as the intermediate carrier of the connection of blade bar 2 and block 3, to realize the quick butt joint of blade bar 2 and block 3, through slot 15 is equipped on block 3, to provide insertion channel for plug-in post 17, so that plug-in post 17 can penetrate block 3 and form cooperation with plug-in block 12, circular groove 16 is connected with the upper portion of through slot 15, the inner diameter of circular groove 16 is greater than the hole diameter of through slot 15, to provide rotation space for two protruding portions 18, and simultaneously limit protruding portion 18 through the step structure formed with through slot 15.

[0044] Plug-in block 12 is equipped with curved surface portion 30 on both sides respectively, plug-in block 12 can slide into through slot 15 through curved surface portion 30, two protruding portions 18 are respectively equipped on the upper end of plug-in post 17, to cooperate with the step structure of circular groove 16 after rotating with plug-in post 17, to realize the locking of plug-in post 17 and block 3, to prevent plug-in post 17 from coming out of through slot 15, plug-in post 17 is inserted in through slot 15, to be used as the core component of the connection of block 3 and plug-in block 12, to realize the fixing and separation of blade bar 2 and block 3 through its locking and unlocking, two protruding portions 18 can rotate in circular groove 16, knob 7 is rotatably connected below block 3, second texture 29 is equipped on knob 7, to facilitate screwing, knob 7 is fixedly connected with plug-in post 17, and knob 7 is used to drive plug-in post 17 to rotate synchronously by manual rotation, to control the rotation angle of two protruding portions 18 in circular groove 16, to realize locking and unlocking operation, block 3 is used to be fixedly installed on the swing shaft of pendulum impact testing machine, to be used as the connection basis of the whole device and testing machine, to integrate the dismounting structure of impact blade on the swing shaft, to ensure the stability of force transmission path during impact test.

[0045] In this embodiment, after the plug-in block 12 on the cutter bar 2 is inserted into the assembly block 3, the insertion post 17 can be inserted into the through groove 15 in the plug-in block 12. When the protruding part 18 on the insertion post 17 abuts against the circular groove 16, the two protruding parts 18 are synchronously rotated in the circular groove 16 by the knob 7. At this time, the protruding part 18 is away from the alignment position corresponding to the through groove 15, and instead forms a limiting fit with the inner wall of the circular groove 16. The rotated protruding part 18 is blocked by the step structure of the circular groove 16 and cannot be axially removed along the through groove 15, so as to realize the stable fixation of the cutter bar 2 on the assembly block 3. When disassembling, the knob 7 is reversely rotated to drive the protruding part 18 to return to the initial position aligned with the through groove 15. At this time, the protruding part 18 is no longer blocked by the step of the circular groove 16, and the insertion post 17 can be removed from the through groove 15 by pulling it upward. Then the plug-in block 12 can be pulled out of the assembly block 3, and the disassembly of the cutter bar 2 is completed. In this way, the convenience and reliability of the disassembly process of the impact blade are improved.

[0046] Embodiment two:

[0047] Different from embodiment one, referring to Figure 4 - Figure 7 The embodiment further has the following further contents:

[0048] The stable assembly includes two balls 20, two mounting barrels 19, two sliding grooves 23, two springs 21 and two fixing grooves 22. The two sliding grooves 23 are respectively arranged on the two protruding parts 18, and are used to provide a precise sliding path for the mounting barrel 19, so as to limit the movement direction of the mounting barrel 19 to be linear movement. The two mounting barrels 19 are respectively slidably connected to the two sliding grooves 23, and are used to carry the balls 20 and simultaneously serve as the connection carrier of the spring 21, so as to drive the balls 20 to synchronously move along the sliding groove 23.

[0049] The two fixing grooves 22 are respectively arranged on the plug-in block 12, and are used to form a clamping fit with the balls 20, so as to limit and fix the rotating position of the protruding part 18. The two balls 20 are respectively movably connected to the two mounting barrels 19, and are used to be clamped into the fixing groove 22 under the action of the spring 21, so as to prevent the protruding part 18 from being accidentally rotated by cooperating with the fixing groove 22. The two springs 21 are respectively fixedly connected to one end of the two mounting barrels 19 and are respectively fixedly connected to the inner wall of the two sliding grooves 23 at the other end. The spring 21 is used to provide a continuous elastic force, so as to push the mounting barrel 19 and the ball 20 to move towards the fixing groove 22.

[0050] In this embodiment, when the plug-in block 12 is inserted into the group block 3, the protruding part 18 is rotated in the circular groove 16 by twisting the knob 7. At this time, the ball 20 on the mounting cylinder 19 is rolled against the inner wall above the circular groove 16 under the pressure of the spring 21. When it rolls to the fixed groove 22, it is inserted into the fixed groove 22 under the elastic force of the spring 21, and forms a clamping connection with the inner wall of the fixed groove 22, limiting the circumferential rotation position of the protruding part 18. At this time, the protruding part 18 cannot continue to rotate in the circular groove 16, ensuring that the protruding part 18 always maintains a locked state with the through groove 15 misaligned, enhancing the stability after installation.

[0051] It should be noted that before taking out the plug-in block 12, a columnar object such as a screw can be inserted into the fixed groove 22 in advance. After the columnar object is inserted, it will extrude the ball 20, causing the ball 20 to move away from the fixed groove 22, thereby releasing the limit on the rotational position of the protruding part 18. At this time, the operator twists the knob 7 in the opposite direction, which drives the plug-in block 17 and the protruding part 18 to rotate until the axis of the protruding part 18 is parallel to the axis of the through groove 15. Then, the plug-in block 17 is pulled upward and removed from the through groove 15, and finally the plug-in block 12 can be smoothly removed from the group block 3.

[0052] Embodiment Three:

[0053] Referring to Figure 3 - Figure 5 Compared with Embodiment One and Embodiment Two, in this embodiment:

[0054] The shockproof assembly includes a threaded area 4, a sleeve 6, a compression ring 8, two connecting blocks 9, and two rubber blocks 10. The sleeve 6 is provided with a first thread 28 for easy twisting. The sleeve 6 is provided with an internal thread 25 inside, which can cooperate with the threaded area 4. The compression ring 8 is provided with a screw set 26. The compression ring 8 is fixedly connected to the two rubber blocks 10 through the screw set 26. The threaded area 4 is arranged on the knife bar 2. The threaded area 4 is used to cooperate with the internal thread 25 on the sleeve 6 to realize the up-down sliding of the sleeve 6. The compression ring 8 is rotatably connected to the sleeve 6. The compression ring 8 is used to transmit the downward pressure of the sleeve 6 and drive the connecting block 9 to move. The two connecting blocks 9 are fixedly connected to the compression ring 8 respectively. The connecting block 9 is used to connect the compression ring 8 and the rubber block 10 and transmit the force. The two rubber blocks 10 are slidingly connected to two groups of slide rails 11 respectively. The slide rail 11 is used to provide sliding guidance for the rubber block 10.

[0055] Two rubber blocks 10 are respectively fixedly installed below two connecting blocks 9, a gap 27 is arranged between the insertion block 12 and the group block 3, the rubber block 10 is tightly attached to the gap 27 between the insertion block 12 and the group block 3, one side of the rubber block 10 is a curved surface, so that the thickness of the rubber block 10 increases when it slides downward, the filling effect of the gap 27 gradually increases, and the rubber block 10 can be more tightly attached to the inner wall of the gap 27 between the insertion block 12 and the group block 3, and the sleeve 6 is slidingly connected to the threaded area 4, and the sleeve 6 is used to realize the upward and downward movement of the sleeve 6 along the threaded area 4 by rotating.

[0056] The alarm assembly includes two installation grooves 5, two touch blocks 14 and two sensors 13, the two touch blocks 14 are respectively fixedly connected to the two sides of the insertion block 12, the touch block 14 is used to shake along with the insertion block 12 and trigger the sensor 13, and the two installation grooves 5 are respectively arranged on the two sides of the group block 3.

[0057] The two sensors 13 are respectively fixedly installed in the two installation grooves 5, the sensor 13 is used to detect the position change of the touch block 14 and trigger the alarm, and a gap is left between the touch block 14 and the sensor 13, which is used to ensure that the sensor 13 is not triggered by mistake when the cutter bar 2 is normally installed.

[0058] In the embodiment, after the insertion block 12 is inserted into the group block 3, the sleeve 6 is rotated to slide downward along the threaded area 4, the pressure ring 8 and the connecting block 9 are driven to move, the rubber block 10 is gradually inserted into the gap 27 between the insertion block 12 and the group block 3, the assembly looseness between the two is eliminated through the filling and extrusion of the rubber block 10, when the impact test is performed, the rubber block 10 can absorb vibration energy through the elastic deformation of the rubber block 10, the cutter bar 2 is prevented from loosening in the long-term impact test, the stability and accuracy of the test are ensured, if the cutter bar 2 loosens, the insertion block 12 will shake along with the cutter bar 2, thereby driving the touch block 14 to approach the sensor 13, after the touch block 14 contacts the sensor 13, the sensor 13 triggers an alarm signal to make the alarm system alarm, the gap between the touch block 14 and the sensor 13 is arranged to ensure that the sensor 13 will not be triggered by mistake in the normal installation state of the cutter bar 2, the accuracy of the alarm signal is ensured, the cutter bar 2 is prevented from being not discovered in time due to loosening, the impact test is prevented from failing or the equipment from being damaged, and the safety and reliability of the device are improved.

[0059] The above merely describes a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A convenient disassembly and assembly device for the impact blade of a pendulum impact testing machine, characterized in that, Including blade (1), sword pole (2), loading and unloading assembly, stable assembly, shockproof assembly and alarm assembly, the lower part of the sword pole (2) is provided with a block (3), the sword pole (2) is fixedly connected with a mounting ring (24), and the sword pole (2) is fixedly connected with the blade (1) through the mounting ring (24); The loading and unloading assembly is used for installing or dismounting the sword pole (2); The stable assembly is used for enhancing the stability of the installation of the sword pole (2); The shockproof assembly is used for avoiding loosening of the blade (1) and the sword pole (2) during impact test; The alarm assembly is used for alarming when the sword pole (2) loosens; The loading and unloading assembly comprises a plug-in block (12), a through slot (15), a plug-in column (17), a circular groove (16) and two convex portions (18); the plug-in block (12) is provided with slide rails (11) on both sides, respectively, and is fixedly connected below the sword pole (2); the through slot (15) is arranged on the block (3); the circular groove (16) is communicated with the upper part of the through slot (15); The block (3) and the plug-in block (12) are respectively provided with clamping seams (27) on both sides, respectively; the plug-in block (12) is respectively provided with curved portions (30) on both sides; the two convex portions (18) are respectively arranged on both sides of the upper end of the plug-in column (17); the plug-in column (17) is plugged into the through slot (15); and the two convex portions (18) can rotate in the circular groove (16); The stable assembly comprises two ball bearings (20), two mounting barrels (19), two sliding grooves (23), two springs (21) and two fixed grooves (22); the two sliding grooves (23) are respectively arranged on the two convex portions (18); and the two mounting barrels (19) are respectively and slidably connected to the two sliding grooves (23); The two fixed grooves (22) are respectively arranged on the plug-in block (12); the two ball bearings (20) are respectively and movably connected to the two mounting barrels (19); one end of the two springs (21) is respectively and fixedly connected to the two mounting barrels (19); and the other end is respectively and fixedly connected to the inner wall of the two sliding grooves (23); and the mounting barrel (19) is slidably connected to the fixed groove (22).

2. The device for conveniently dismounting and mounting the impact blade of a pendulum impact testing machine according to claim 1, characterized in that, The shockproof assembly comprises a threaded area (4), a sleeve (6), a compression ring (8), two connecting blocks (9) and two rubber blocks (10); the threaded area (4) is arranged on the sword pole (2); the compression ring (8) is rotatably connected to the sleeve (6); the two connecting blocks (9) are respectively and fixedly connected to the compression ring (8); and the two rubber blocks (10) are respectively and slidably connected to the two groups of slide rails (11).

3. The device for easy mounting and dismounting of the impact blade of a pendulum impact testing machine according to claim 2, characterized in that, A first thread (28) is arranged on the sleeve (6); an internal thread (25) is arranged in the sleeve (6); a screw group (26) is arranged on the compression ring (8); the compression ring (8) is fixedly connected to the two rubber blocks (10) through the screw group (26); the rubber block (10) is closely attached to the clamping seam (27) between the plug-in block (12) and the block (3); and the sleeve (6) is slidably connected to the threaded area (4).

4. The device for conveniently dismounting and mounting the impact blade of a pendulum impact testing machine according to claim 1, characterized in that, Said alarm assembly includes two installation slots (5), two touch blocks (14) and two sensors (13), two said touch blocks (14) are fixedly connected on both sides of the plug-in block (12), two said installation slots (5) are arranged on both sides of the group block (3).

5. The device for easy removal of the impact blade of a pendulum impact testing machine according to claim 4, characterized in that, Two said sensors (13) are fixedly installed in two installation slots (5), and a gap is left between the touch block (14) and the sensor (13).

6. The device for easy mounting and dismounting of the impact blade of a pendulum impact testing machine according to claim 3, characterized in that, Said group block (3) is rotatably connected with a knob (7) below, the knob (7) is fixedly connected with a plug-in column (17), a second pattern (29) is arranged on the knob (7), one side of the rubber block (10) is a curved surface, and the group block (3) is used for fixedly installed on the swing shaft of the pendulum impact testing machine.

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