Rigidity testing device with function of preventing material from being damaged

Abstract

The invention discloses a rigidity testing device with a material damage prevention function, and relates to the technical field of rigidity testing devices. Comprising a rack, a moving module is arranged on the rack, a longitudinal electric cylinder is installed on the moving module, a supporting shaft is connected to a telescopic rod of the longitudinal electric cylinder, a rotating cylinder is installed on the supporting shaft, a rotating plate is installed below the rotating cylinder, multiple sets of clamping plates are rotatably installed on the rotating plate, and two sets of negative pressure belts are installed on the clamping plates. A collision rod is installed between the two sets of negative pressure belts, a bearing frame is installed below the rotating cylinder, a clamping electric cylinder is installed on the bearing frame, multiple sets of laser displacement sensors are installed on the outer side of the bearing frame, a storage box is installed on one side of the bearing frame, two sets of feeding lines are installed in the storage box, and the multiple sets of laser displacement sensors detect displacement of material plates. After the control system processes the material plate, the rigidity of the material plate is obtained, the rigidity of the material plate is detected and measured in a vibration mode, and the material plate cannot be damaged.

Description

Technical Field

[0001] The invention relates to the technical field of stiffness testing devices, in particular to a stiffness testing device with a function of preventing material damage. Background Art

[0002] Stiffness refers to the ability of a material or structure to resist elastic deformation when subjected to stress. It represents the ease with which a material or structure can deform elastically. In the field of engineering material and structural component performance testing, stiffness is a key indicator of an object's ability to resist elastic deformation, directly impacting product durability and safety. Stiffness testing is the process of determining an object's ability to resist deformation when subjected to stress. Stiffness testing assesses the deformation of a material or component under a specific load, thereby determining its stiffness.

[0003] The existing stiffness testing devices have the following main problems: (1) the testing efficiency is low and it is difficult to meet the needs of batch testing; (2) the surface of the material plate after testing is easily damaged, resulting in waste. Summary of the Invention

[0004] The purpose of the present invention is to provide a stiffness testing device with the function of preventing material damage, so as to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a stiffness testing device with the function of preventing material damage, comprising a frame, a movable module is provided on the frame, a longitudinal electric cylinder is installed on the movable module, a support shaft is connected to the telescopic rod of the longitudinal electric cylinder, a rotating cylinder is installed on the support shaft, a rotating plate is installed below the rotating cylinder, multiple groups of clamping plates are rotatably installed on the rotating plate, two groups of negative pressure belts are installed on the clamping plate, an impact rod is installed between the two groups of negative pressure belts, a carrying frame is installed below the rotating cylinder, a clamping electric cylinder is installed on the carrying frame, multiple groups of laser displacement sensors are installed on the outside of the carrying frame, a storage box is installed on one side of the carrying frame, and two groups of feeding lines are installed in the storage box.

[0006] The support shaft surface is provided with a lifting groove, and the inner wall of the rotating cylinder is provided with a sliding shaft, and the sliding shaft is slidably connected with the lifting groove; The rotating plate is rotatably installed on the support shaft, a circular plate is rotatably provided on the upper side of the rotating cylinder, and multiple groups of telescopic shafts are rotatably connected to the lower side of the rotating cylinder. The multiple groups of telescopic shafts are telescopic structures, and one end of the telescopic shaft is rotatably connected to the clamping plate. A memory metal wire is connected between the circular plate and the support shaft, and both ends of the memory metal wire are electrically connected to the control system.

[0007] The inner sides of the two groups of negative pressure belts are in contact with multiple groups of negative pressure rollers, and the multiple groups of negative pressure rollers are installed on the clamping plate. The inside of the negative pressure belt is connected to the negative pressure system through an air slip ring and a pipeline. Several negative pressure holes are provided on the negative pressure belt, and the air slip ring is installed on the clamping plate.

[0008] Both groups of feeding lines include conveying rollers, conveyor belts and carrier plates. The conveying rollers are installed on the storage box. There are multiple groups of conveying rollers and carrier plates. The carrier plates carry material plates. The inner side of the conveyor belt is in contact with multiple groups of conveying rollers. Multiple groups of carrier plates are arranged on the conveyor belts.

[0009] A plurality of adsorption holes are provided on the inner wall of the storage box, and the plurality of adsorption holes are connected to the negative pressure system through pipelines.

[0010] The carrier is installed on the frame, and the clamping electric cylinder is provided with multiple groups, and the multiple groups of clamping electric cylinders are all installed on the carrier. A carrier plate is slidably installed in the middle of the carrier, and a carrier shaft is connected between the carrier plate and the frame. The carrier shaft is a telescopic structure, and a shock-absorbing spring is sleeved on the carrier shaft. One end of the shock-absorbing spring is connected to the carrier plate, and the other end of the shock-absorbing spring is provided with a shock-absorbing ring. The shock-absorbing ring is slidably connected to the carrier shaft, and the shock-absorbing ring is connected to the telescopic rod of the lifting electric cylinder, and the lifting electric cylinder is installed on the frame.

[0011] The movable module includes a transverse module and a longitudinal module, the transverse module includes a transverse motor, a transverse screw and a transverse slide, the transverse motor is installed on the frame, the output shaft of the transverse motor is connected to the transverse screw, the transverse screw is connected to the frame through a bearing seat, the bearing seat is set on the frame, the transverse slide is threadedly connected to the transverse screw, and the transverse slide is slidably connected to the frame; The longitudinal module includes a longitudinal motor, a longitudinal screw and a longitudinal slide. The longitudinal motor is installed on the transverse slide. The longitudinal motor is connected to the longitudinal screw. The longitudinal screw is connected to the transverse slide through another set of bearing seats. The other set of bearing seats is installed on the transverse slide. The longitudinal slide is threadedly connected to the longitudinal screw. The longitudinal electric cylinder is installed on the longitudinal slide.

[0012] The clamping plate is provided with a circular groove, the impact rod is located in the circular groove, and a second spring is connected between the impact rod and the clamping plate.

[0013] A control panel is provided on the frame, and a control system is provided in the control panel.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The storage box automatically feeds and removes dust to improve test efficiency. The left conveyor roller drives the left conveyor belt to rotate counterclockwise, while the right conveyor roller drives the right conveyor belt to rotate clockwise. The conveyor belts on both sides simultaneously drive the material plates upward through the loading plate. When the material plates are in the storage box, the control system uses the negative pressure system and adsorption holes to extract air dust and air to achieve dust removal of the material plates, preventing dust from adversely affecting the stiffness test and improving stiffness test efficiency.

[0015] 2. Vibration test to prevent damage to the material plate. When the impact rod approaches the surface of the material plate, the control system continuously energizes and deenergizes the second spring. After the second spring is energized, each turn generates a mutually attractive magnetic field. The mutually attractive magnetic field shortens the second spring as a whole, and the second spring pulls the impact rod away from the material plate; when the second spring is deenergized, the second spring gradually lengthens under its own elastic force, and the second spring pushes the impact rod toward the material plate, causing one end of the impact rod to hit the material plate. By continuously energizing and deenergizing the second spring, the impact rod continuously hits the material plate, causing the material plate to vibrate. At this time, multiple groups of laser displacement sensors detect the displacement of the material plate and feed the data back to the control system. After processing, the control system obtains the stiffness of the material plate; the use of vibration to detect and measure the stiffness of the material plate will not cause damage to the material plate.

[0016] 3. Buffer plates are used to prevent scratches on the material plates. Staff flexibly adjust the extension and retraction length of the lifting cylinder based on the required buffering effect of the material plates. When the lifting cylinder extends, it drives the shock-absorbing ring upward, making the shock-absorbing spring between the load plate and the shock-absorbing ring denser. This gradually improves the buffering effect of the load plate and prevents scratches on the material plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 It is a structural diagram of the longitudinal motor in the present invention; Figure 3 It is a structural schematic diagram of the storage box in the present invention; Figure 4 It is a schematic structural diagram of the shock-absorbing spring in the present invention; Figure 5 It is a structural schematic diagram of the rotating drum in the present invention; Figure 6 It is a structural diagram of the circular ring plate in the present invention.

[0018] In the figure: 1. control panel; 11. frame; 2. longitudinal electric cylinder; 21. support shaft; 211. lifting groove; 22. rotating cylinder; 221. sliding shaft; 222. circular ring plate; 223. telescopic shaft; 224. memory wire; 23. rotating plate; 231. clamping plate; 24. negative pressure belt; 241. negative pressure roller; 25. impact rod; 251. second spring; 3. bearing frame; 31. clamping electric cylinder; 32. bearing plate; 33. bearing shaft; 34. shock-absorbing spring; 35. shock-absorbing ring; 36. lifting electric cylinder; 4. storage box; 41. conveying roller; 42. conveyor belt; 43. loading plate; 5. transverse motor; 51. transverse screw rod; 52. transverse slide plate; 6. longitudinal motor; 61. longitudinal screw rod; 62. longitudinal slide plate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] Example: Figures 1-6 As shown, the present invention provides a technical solution for a stiffness testing device with a function of preventing material damage, comprising a frame 11, a mobile module provided on the frame 11, a longitudinal electric cylinder 2 installed on the mobile module, a support shaft 21 connected to the telescopic rod of the longitudinal electric cylinder 2, a rotating cylinder 22 installed on the support shaft 21, a rotating plate 23 installed below the rotating cylinder 22, a plurality of clamping plates 231 rotatably installed on the rotating plate 23, two sets of negative pressure belts 24 installed on the clamping plates 231, and a pressure relief device 231 installed between the two sets of negative pressure belts 24. The impact rod 25 and the clamping plate 231 are provided with a circular groove, the impact rod 25 is located in the circular groove, and a second spring 251 is connected between the impact rod 25 and the clamping plate 231. A carrier frame 3 is installed under the rotating cylinder 22, and a clamping electric cylinder 31 is installed on the carrier frame 3. Multiple groups of laser displacement sensors (not shown in the figure) are installed on the outside of the carrier frame 3, and a storage box 4 is installed on one side of the carrier frame 3. Two groups of feeding lines are installed in the storage box 4. A control panel 1 is provided on the frame 11, and a control system is provided in the control panel 1.

[0021] A lifting groove 211 is provided on the surface of the support shaft 21, and a sliding shaft 221 is provided on the inner wall of the rotating cylinder 22, and the sliding shaft 221 is slidingly connected to the lifting groove 211; the rotating plate 23 is rotatably installed on the support shaft 21, and a circular ring plate 222 is rotatably provided on the upper side of the rotating cylinder 22, and a plurality of groups of telescopic shafts 223 are rotatably connected to the lower side of the rotating cylinder 22. The plurality of telescopic shafts 223 are telescopic structures, and one end of the telescopic shaft 223 is rotatably connected to the clamping plate 231. A memory metal wire 224 is connected between the circular ring plate 222 and the support shaft 21, and both ends of the memory metal wire 224 are electrically connected to the control system.

[0022] The inner sides of the two sets of negative pressure belts 24 are in contact with multiple sets of negative pressure rollers 241, and the multiple sets of negative pressure rollers 241 are installed on the clamping plate 231. The inside of the negative pressure belt 24 is connected to the negative pressure system through an air slip ring (not shown in the figure) and a pipeline. Several negative pressure holes are provided on the negative pressure belt 24, and the air slip ring is installed on the clamping plate 231.

[0023] Both feeding lines include conveying rollers 41, conveying belts 42 and loading plates 43. The conveying rollers 41 are installed on the storage box 4. There are multiple groups of conveying rollers 41 and loading plates 43. The loading plates 43 carry material plates. The inner side of the conveying belt 42 is in contact with the multiple groups of conveying rollers 41. The multiple groups of loading plates 43 are arranged on the conveying belt 42. There are multiple groups of adsorption holes on the inner wall of the storage box 4. The multiple groups of adsorption holes are connected to the negative pressure system (not shown in the figure) through pipes.

[0024] When the material plate is in the storage box 4, the control system extracts the air dust and air outward through the negative pressure system and the adsorption holes to achieve dust removal of the material plate and prevent the dust from having an adverse effect on the stiffness test.

[0025] The carrier frame 3 is installed on the frame 11, and multiple groups of clamping electric cylinders 31 are provided. Multiple groups of clamping electric cylinders 31 are all installed on the carrier frame 3. A carrier plate 32 is slidably installed in the middle of the carrier frame 3, and a carrier shaft 33 is connected between the carrier plate 32 and the frame 11. The carrier shaft 33 is a telescopic structure, and a shock-absorbing spring 34 is sleeved on the carrier shaft 33. One end of the shock-absorbing spring 34 is connected to the carrier plate 32, and the other end of the shock-absorbing spring 34 is provided with a shock-absorbing ring 35. The shock-absorbing ring 35 is slidably connected to the carrier shaft 33, and the shock-absorbing ring 35 is connected to the telescopic rod of the lifting electric cylinder 36. The lifting electric cylinder 36 is installed on the frame 11.

[0026] When the material plate is placed on the supporting plate 32, the staff flexibly adjusts the telescopic length of the lifting cylinder 36 according to the required buffering effect of the material plate; when the lifting cylinder 36 is extended, the lifting cylinder 36 drives the shock-absorbing ring 35 to move upward, so that the shock-absorbing spring 34 between the supporting plate 32 and the shock-absorbing ring 35 becomes denser, and the buffering effect of the supporting plate 32 gradually improves.

[0027] The mobile module includes a transverse module and a longitudinal module. The transverse module includes a transverse motor 5, a transverse screw rod 51 and a transverse slide 52. The transverse motor 5 is installed on the frame 11. The output shaft of the transverse motor 5 is connected to the transverse screw rod 51. The transverse screw rod 51 is connected to the frame 11 through a bearing seat. The bearing seat is set on the frame 11. The transverse slide 52 is threadedly connected to the transverse screw rod 51. The transverse slide 52 is slidingly connected to the frame 11; the longitudinal module includes a longitudinal motor 6, a longitudinal screw rod 61 and a longitudinal slide 62. The longitudinal motor 6 is installed on the transverse slide 52. The longitudinal motor 6 is connected to the longitudinal screw rod 61. The longitudinal screw rod 61 is connected to the transverse slide 52 through another set of bearing seats. The other set of bearing seats is installed on the transverse slide 52. The longitudinal slide 62 is threadedly connected to the longitudinal screw rod 61. The longitudinal electric cylinder 2 is installed on the longitudinal slide 62.

[0028] Working principle: Press the start button on the control panel 1, the device starts, the conveyor roller 41 on the left drives the conveyor belt 42 on the left to rotate counterclockwise, and the conveyor roller 41 on the right drives the conveyor belt 42 on the right to rotate clockwise. The conveyor belts 42 on both sides simultaneously drive the material plate to move upward through the loading plate 43. The material plate is a steel plate.

[0029] When the material plate moves to the top of the storage box 4, the encoders in the conveying rollers 41 on both sides feed back data to the control system. The control system drives the horizontal screw rod 51 to rotate through the horizontal motor 5, and the horizontal screw rod 51 drives the horizontal slide 52 to move. The horizontal slide 52 drives the longitudinal motor 6 to move. The longitudinal motor 6 drives the longitudinal screw rod 61 to rotate, and the longitudinal screw rod 61 drives the longitudinal slide 62 to move. The longitudinal slide 62 drives the longitudinal electric cylinder 2, the support shaft 21 and the rotating cylinder 22 to move. The support shaft 21 drives the clamping plate 231 to be located above the material plate.

[0030] When the clamping plate 231 is located above the material plate, the control system energizes the memory wire 224, and the memory wire 224 gradually contracts after being energized. The memory wire 224 pulls the annular plate 222 to move upward, and the annular plate 222 drives the rotating cylinder 22 to move upward. The sliding shaft 221 in the rotating cylinder 22 slides in the lifting groove 211, and the rotating cylinder 22 drives the clamping plate 231 to a horizontal state through the telescopic shaft 223.

[0031] When the clamping plate 231 is in a horizontal state, the control system drives the support shaft 21 to move downward through the longitudinal electric cylinder 2, and the support shaft 21 drives the rotating cylinder 22 and the clamping plate 231 to move downward, so that the negative pressure belt 24 on the clamping plate 231 contacts the material sheet. The negative pressure system draws the air in the negative pressure belt 24 outward, so that the negative pressure hole adsorbs and positions the material sheet.

[0032] After the negative pressure hole adsorbs and positions the material sheet, the negative pressure system feeds back the pressure signal to the control system. The control system cooperates with the horizontal module and the longitudinal module to move the material sheet above the supporting plate 32. After that, the longitudinal electric cylinder 2 drives the rotating cylinder 22 to move downward through the support shaft 21, and the support shaft 21 drives the clamping plate 231 to move downward. The clamping plate 231 drives the material sheet to move downward, so that the material sheet is placed on the supporting plate 32.

[0033] When the material sheet is placed on the supporting plate 32, the negative pressure system no longer extracts the air in the negative pressure belt 24 outward, and drives the support shaft 21, the rotating cylinder 22 and the clamping plate 231 to move upward through the longitudinal electric cylinder 2. Then, the clamping electric cylinder 31 positions the material sheet.

[0034] When the material plate is positioned by the clamping electric cylinder 31, the control system cuts off the power to the memory wire 224. The memory wire 224 gradually becomes longer under the action of its own elastic force. The memory wire 224 pushes the annular plate 222 to move downward, and the annular plate 222 drives the rotating cylinder 22 to move downward. The sliding shaft 221 inside the rotating cylinder 22 slides downward, and the rotating cylinder 22 drives the clamping plate 231 from a horizontal state to a vertical state through the telescopic shaft 223. At this time, the impact rod 25 on the clamping plate 231 is facing the material plate.

[0035] When the impact rod 25 is facing the material plate, the control system drives the support shaft 21 and the rotating cylinder 22 to move downward through the longitudinal electric cylinder 2, and the support shaft 21 drives the clamping plate 231 and the impact rod 25 to move downward, so that the impact rod 25 is close to the surface of the material plate.

[0036] When the impact rod 25 approaches the surface of the material plate, the control system continuously energizes and deenergizes the second spring 251. After the second spring 251 is energized, each turn generates a mutually attractive magnetic field, and the mutually attractive magnetic field causes the second spring 251 to shorten as a whole, and the second spring 251 pulls the impact rod 25 away from the material plate; when the second spring 251 is deenergized, the second spring 251 gradually lengthens under the action of its own elastic force, and the second spring 251 pushes the impact rod 25 toward the material plate, so that one end of the impact rod 25 hits the material plate. By continuously energizing and deenergizing the second spring 251, the impact rod 25 continuously hits the material plate, causing the material plate to vibrate. At this time, multiple groups of laser displacement sensors detect the displacement of the material plate and feed back the data to the control system. After processing, the control system obtains the stiffness of the material plate; the use of vibration to detect and measure the stiffness of the material plate will not cause damage to the material plate.

[0037] After the material plate has passed the stiffness test, the control system controls the clamping electric cylinder 31 to release the material plate, and the staff removes the material plate.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A stiffness testing device with a function of preventing material damage, characterized in that: The invention comprises a frame (11), wherein a movable module is provided on the frame (11), a longitudinal electric cylinder (2) is installed on the movable module, a support shaft (21) is connected to the telescopic rod of the longitudinal electric cylinder (2), a rotating cylinder (22) is installed on the support shaft (21), a rotating plate (23) is installed below the rotating cylinder (22), a plurality of clamping plates (231) are rotatably installed on the rotating plate (23), two groups of negative pressure belts (24) are installed on the clamping plate (231), a collision rod (25) is installed between the two groups of negative pressure belts (24), a carrier (3) is installed below the rotating cylinder (22), a clamping electric cylinder (31) is installed on the carrier (3), a plurality of laser displacement sensors are installed on the outside of the carrier (3), a storage box (4) is installed on one side of the carrier (3), and two groups of feeding lines are installed in the storage box (4).

2. The stiffness testing device with the function of preventing material damage according to claim 1, characterized in that: A lifting groove (211) is provided on the surface of the support shaft (21), and a sliding shaft (221) is provided on the inner wall of the rotating cylinder (22), wherein the sliding shaft (221) is slidably connected to the lifting groove (211); The rotating plate (23) is rotatably mounted on the support shaft (21); a circular plate (222) is rotatably provided on the upper side of the rotating cylinder (22); a plurality of telescopic shafts (223) are rotatably connected to the lower side of the rotating cylinder (22); the plurality of telescopic shafts (223) are telescopic structures; one end of the telescopic shaft (223) is rotatably connected to the clamping plate (231); a memory metal wire (224) is connected between the circular plate (222) and the support shaft (21); and both ends of the memory metal wire (224) are electrically connected to a control system.

3. The stiffness testing device with the function of preventing material damage according to claim 2, characterized in that: The inner sides of the two groups of negative pressure belts (24) are in contact with multiple groups of negative pressure rollers (241), and the multiple groups of negative pressure rollers (241) are installed on the clamping plate (231). The interior of the negative pressure belt (24) is connected to the negative pressure system through an air slip ring and a pipeline. A plurality of negative pressure holes are provided on the negative pressure belt (24), and the air slip ring is installed on the clamping plate (231).

4. The stiffness testing device with the function of preventing material damage according to claim 3, characterized in that: The two groups of feeding lines each include a conveying roller (41), a conveying belt (42) and a loading plate (43). The conveying roller (41) is installed on the storage box (4). Multiple groups of the conveying roller (41) and the loading plate (43) are provided. The loading plate (43) carries material plates. The inner side of the conveying belt (42) contacts the multiple groups of conveying rollers (41). The multiple groups of loading plates (43) are provided on the conveying belt (42).

5. The stiffness testing device with the function of preventing material damage according to claim 4, characterized in that: A plurality of groups of adsorption holes are provided on the inner wall of the storage box (4), and the plurality of groups of adsorption holes are connected to the negative pressure system through pipelines.

6. The stiffness testing device with the function of preventing material damage according to claim 5, characterized in that: The carrier frame (3) is mounted on the frame (11), and the clamping electric cylinder (31) is provided with multiple groups. The multiple groups of the clamping electric cylinders (31) are all mounted on the carrier frame (3). A carrier plate (32) is slidably mounted in the middle of the carrier frame (3), and a carrier shaft (33) is connected between the carrier plate (32) and the frame (11). The carrier shaft (33) is a telescopic structure. A shock-absorbing spring (34) is sleeved on the carrier shaft (33), one end of the shock-absorbing spring (34) is connected to the carrier plate (32), and the other end of the shock-absorbing spring (34) is provided with a shock-absorbing ring (35). The shock-absorbing ring (35) is slidably connected to the carrier shaft (33), and the shock-absorbing ring (35) is connected to the telescopic rod of the lifting electric cylinder (36). The lifting electric cylinder (36) is mounted on the frame (11).

7. The stiffness testing device with the function of preventing material damage according to claim 6, characterized in that: The movable module comprises a transverse module and a longitudinal module, the transverse module comprises a transverse motor (5), a transverse screw rod (51) and a transverse slide plate (52), the transverse motor (5) is mounted on the frame (11), the output shaft of the transverse motor (5) is connected to the transverse screw rod (51), the transverse screw rod (51) is connected to the frame (11) via a bearing seat, the bearing seat is arranged on the frame (11), the transverse slide plate (52) and the transverse screw rod (51) are threadedly connected, and the transverse slide plate (52) is slidably connected to the frame (11); The longitudinal module comprises a longitudinal motor (6), a longitudinal screw rod (61) and a longitudinal slide (62), wherein the longitudinal motor (6) is mounted on the transverse slide (52), the longitudinal motor (6) is connected to the longitudinal screw rod (61), the longitudinal screw rod (61) is connected to the transverse slide (52) through another set of bearing seats, the other set of bearing seats is mounted on the transverse slide (52), the longitudinal slide (62) is threadedly connected to the longitudinal screw rod (61), and the longitudinal electric cylinder (2) is mounted on the longitudinal slide (62).

8. The stiffness testing device with the function of preventing material damage according to claim 7, characterized in that: A circular groove is provided on the clamping plate (231), the impact rod (25) is located in the circular groove, and a second spring (251) is connected between the impact rod (25) and the clamping plate (231).

9. The stiffness testing device with the function of preventing material damage according to claim 8, characterized in that: A control panel (1) is provided on the frame (11), and a control system is provided in the control panel (1).

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