Road material compressive strength detection device

Abstract

The invention relates to the technical field of strength detection, and discloses a road material compressive strength detection device which comprises a frame, a probe rod, a rammer and a grabbing hammer assembly. A guide ring is arranged at the lower end of the frame, the probe rod penetrates through the guide ring, a mounting part is connected to the interior of the frame in an up-down sliding mode, the rammer is connected to the mounting part, and the mounting part can move up and down along with the rammer; a supporting assembly and a positioning assembly used for positioning the supporting assembly are arranged on the inner wall of the frame, when the positioning assembly positions the supporting assembly, the height position of the supporting assembly is lower than the upper end of the probe rod, and when the positioning assembly relieves positioning of the supporting assembly, the height position of the supporting assembly is lower than the upper end of the probe rod. The supporting assembly can move upwards to the position higher than the upper end of the probe rod. The situation that the rammer hits the probe rod for multiple times due to springback can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of strength detection, and in particular to a device for detecting the compressive strength of road materials. Background Art

[0002] The main purpose of municipal road compressive strength testing is to evaluate the resistance of the road structure layer to vertical pressure, that is, compressive strength. Through testing, we can understand the actual bearing capacity of the road structure and provide a scientific basis for the design, construction, maintenance and repair of the road. Among the municipal road strength testing devices, the probe device is widely used. When testing the probe device, the probe is set vertically on the road surface, and then a heavy hammer of a certain weight is used to hammer the upper end of the probe, and then the damage to the road surface caused by the lower end of the probe is observed.

[0003] The existing Chinese invention patent with application number 202310661849.2 discloses a compressive strength testing device for municipal roads, including a testing chassis group, a testing tripod installed on the upper end of the testing chassis group, a probe rod assembly installed on the testing chassis group, and a hammer release mechanism and a hammer assembly installed on the testing tripod. The hammer release mechanism grabs and releases the hammer assembly, causing the hammer assembly to fall downward and hit the upper end of the probe rod assembly, so that the lower end of the probe rod tests the road surface.

[0004] In the above scheme, when the hammer assembly falls downward, after the hammer hits the upper end of the probe rod assembly, the hammer rebounds due to the reaction force of the probe rod assembly. The hammer will rebound multiple times, thus causing multiple impacts on the probe rod, and the force of each impact gradually decreases, so the detection result is easily affected. Summary of the invention

[0005] In order to reduce the additional force applied to the probe rod due to multiple rebounds of the hammer, the present application provides a road material compressive strength testing device.

[0006] This application adopts the following technical solutions: A road material compressive strength testing device comprises a frame, a probe rod, a hammer and a grab hammer assembly; a guide ring is arranged at the lower end of the frame, the probe rod passes through the guide ring, a mounting portion is slidably connected in the frame, the hammer is connected to the mounting portion, and the mounting portion can move up and down with the hammer; a support assembly and a positioning assembly for positioning the support assembly are arranged on the inner wall of the frame, when the positioning assembly positions the support assembly, the height position of the support assembly is lower than the upper end of the probe rod, and when the positioning assembly releases the positioning of the support assembly, the support assembly can move upward to a position higher than the upper end of the probe rod; An unlocking piece is provided at the lower end of the mounting portion. When the hammer moves downward and hits the upper end of the probe rod, the unlocking piece can release the positioning of the supporting assembly by the positioning assembly. After the supporting assembly moves upward, it can support the mounting portion so that a gap exists between the hammer and the probe rod.

[0007] By adopting the above technical solution, the initial position of the support assembly is lower than the upper end of the probe rod, so the hammer can hit the upper end of the probe rod for detection; under the action of the unlocking member, the positioning assembly releases the positioning of the support assembly, and the support assembly can move upward to a position higher than the upper end of the probe rod, so that when the hammer rebounds and moves downward again, the support assembly can support the hammer, so that the hammer no longer hits the probe rod, thereby reducing the situation where the hammer hits the probe rod multiple times due to rebound.

[0008] Optionally, guide grooves are symmetrically opened on the inner wall of the frame, and the mounting portion includes a seat body and an extension rod symmetrically arranged on the side wall of the seat body, and the extension rod extends into the guide groove; the positioning assembly and the support assembly are installed in the guide groove, and the unlocking member is installed on the lower surface of the extension rod.

[0009] By adopting the above technical solution, under the action of the guide groove, the mounting part can slide more stably along the vertical direction.

[0010] Optionally, the support assembly includes a support rod located in the guide groove and locking members arranged at both ends of the support rod, the positioning assembly positions the support rod, and a driving member is arranged between the lower end of the guide groove and the support rod, when the positioning assembly releases the positioning of the support rod, the driving member drives the support rod to move upward, and the locking member positions the support rod so that the support rod supports the mounting portion.

[0011] By adopting the above technical solution, after the positioning assembly releases the positioning of the support rod, the driving member drives the support rod to move upward, and after moving to a certain position, the locking member positions the support rod, so that the support rod supports the hammer.

[0012] Optionally, both ends of the support rod are provided with accommodating grooves, and the locking member includes a locking rod slidably set in the accommodating groove and a first elastic member set in the accommodating groove, the inner wall of the accommodating groove is provided with a clearance groove for the locking rod to slide up and down, and a locking groove is provided in the clearance groove, the depth of the locking groove is greater than the depth of the clearance groove, when the support rod moves upward and drives the locking rod to move to the position of the locking groove, the first elastic member drives the locking rod to be inserted into the locking groove.

[0013] By adopting the above technical solution, the depths of the clearance groove and the locking groove are different, so that a step edge is formed at the connection. After the locking rod abuts against the locking groove, the support rod cannot move downward, thereby supporting the hammer.

[0014] Optionally, the positioning assembly includes a positioning seat and a positioning block arranged on the positioning seat, the side wall of the support rod is provided with a positioning groove for the positioning block to be plugged in; the inner wall of the guide groove is provided with a plugging groove, the positioning seat is provided with an insertion rod slidably plugged into the plugging groove, and a second elastic member is provided in the plugging groove; under the action of the second elastic member, the positioning block is plugged into the positioning groove, and when the mounting part moves downward, the unlocking member drives the positioning seat to move in a direction away from the support rod, the second elastic member is compressed and the positioning block slides out of the positioning groove.

[0015] By adopting the above technical solution, the insertion rod is inserted into the insertion slot, the unlocking member moves downward and squeezes the positioning block to move in the direction close to the insertion slot, the positioning block can be detached from the positioning slot, and the driving member can drive the support rod to move upward.

[0016] Optionally, the driving member includes a driving rod arranged on the side wall of the support rod and a third elastic member arranged on the side wall of the driving rod; a sliding groove is provided on the inner bottom surface of the guide groove, the driving rod is slidably inserted in the sliding groove, and one end of the third elastic member abuts against the side wall of the support rod, and the other end abuts against the inner bottom surface of the guide groove; when the positioning block abuts against the positioning groove, the third elastic member is in a compressed state.

[0017] By adopting the above technical solution, with the cooperation of the driving rod and the third elastic member, the supporting rod can be pushed to move upward and the locking rod can be brought into the position of the locking groove.

[0018] Optionally, a fixing rod is symmetrically provided on the side wall of the guide ring, and one end of the fixing rod away from the guide ring is connected to the inner wall of the frame; abutment blocks are symmetrically provided on the inner wall of the guide ring, and a fourth elastic member is provided between the abutment block and the inner wall of the guide ring; under the action of the fourth elastic member, the abutment block abuts against the side wall of the probe rod; a resistance rod is slidably connected in the fixing rod, one end of the resistance rod extends into the guide ring and abuts against the side of the abutment block away from the probe rod, and the other end of the resistance rod is linked to the driving rod, and when the driving rod slides upward, the end of the resistance rod is separated from the abutment block.

[0019] By adopting the above technical solution, when the abutment rod abuts against the abutment block, the abutment block is not easy to move, thereby keeping the probe rod in a vertical state. After the hammer hits the probe rod, the driving rod moves upward, and the abutment rod and the abutment block are separated, so that the abutment block has a certain movement space. Under the action of the fourth elastic member, it can play a shock-absorbing effect, reducing the vibration of the probe rod and causing the frame to deviate.

[0020] Optionally, the sliding groove extends vertically downward, one end of the resistance rod passes through the frame surface and extends into the sliding groove, a fifth elastic member is arranged between the inner wall of the fixed rod and the resistance rod, the end of the resistance rod abuts against the end of the driving rod so that the resistance rod abuts against the abutment block, and when the driving rod slides upward, the fifth elastic member drives the resistance rod to slide in a direction away from the abutment block.

[0021] By adopting the above technical solution, the resistance rod abuts against the outer wall of the driving rod, and the driving rod moves upward, and the fifth elastic member drives the resistance rod to slide toward the sliding groove; the driving rod slides downward, pushing the resistance rod to slide toward the abutment block.

[0022] Optionally, the side wall of the support rod is provided with a long groove connected to the accommodating groove, and the side wall of the locking rod is provided with an extension block passing through the long groove, and when the locking rod slides in the accommodating groove, the extension block slides in the long groove.

[0023] By adopting the above technical solution, the locking rod can be driven to slide by the extension block, thereby facilitating the resetting of the support assembly.

[0024] Optionally, the grab hammer assembly includes a rotating roller rotatably arranged at the upper end of the frame, a winding rope arranged on the side wall of the rotating roller, and a clamp arranged at the lower end of the winding rope; the clamp is located in the frame and is used to grab or release the hammer.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. After the hammer hits the probe rod and rebounds upward, the positioning assembly releases the positioning of the support assembly, allowing the positioning assembly to move upward and be positioned by the locking member, and then supports the hammer, so that the hammer will not hit the probe rod again after rebounding. If multiple impacts are required, the support assembly can be reset; 2. When the abutment rod abuts against the abutment block, it can guide the probe rod so that the probe rod is not easily skewed. When the abutment rod and the abutment block are separated, the fourth elastic member can have a shock-absorbing effect, reduce the vibration of the probe rod transmitted to the frame, and improve stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of an embodiment of the present application; Figure 2 is a cross-sectional schematic diagram of an embodiment of the present application; Figure 3 yes Figure 1 The enlarged schematic diagram of point A in the middle; Figure 4 yes Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 is an exploded schematic diagram of the support assembly; Figure 6 yes Figure 2 Enlarged schematic diagram of point C in the middle.

[0027] Explanation of reference numerals: 1, frame; 2, probe rod; 3, striker; 4, hammer assembly; 41, rotating roller; 42, winding rope; 43, clamp; 5, guide ring; 6, mounting portion; 61, seat body; 62, extension rod; 7, support assembly; 71, support rod; 72, locking member; 721, locking rod; 722, first elastic member; 8, positioning assembly; 81, positioning seat; 82, positioning block; 9, unlocking member; 10, guide slot; 11, driving member; 111, driving rod; 112, third elastic member; 12, accommodating slot; 13, giving way slot; 14, locking slot; 15, positioning slot; 16, plug rod; 17, plug-in slot; 18, second elastic member; 19, fixing rod; 20, abutment block; 21, fourth elastic member; 22, abutment rod; 23, fifth elastic member; 24, long slot; 25, extension block; 26, installation space; 27, sliding slot. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-6 This application is described in further detail.

[0029] The present application embodiment discloses a device for detecting the compressive strength of road materials. Figure 1 The detection device includes a frame 1, a probe rod 2, a hammer 3 and a grab hammer assembly 4. The frame 1 is vertically arranged and has a door-shaped structure. In order to improve the stability of the frame 1, the lower end of the frame 1 can be fixed to a support frame by bolts or the like. A guide ring 5 is fixed at the lower end of the inner cavity of the frame 1, and the probe rod 2 vertically passes through the guide ring 5, so that the probe rod 2 can be in a vertical state. The grab hammer assembly 4 is used to grab the hammer 3 and release the hammer 3, so that the hammer 3 can move downward and hit the upper end of the probe rod 2.

[0030] The grab hammer assembly 4 includes a rotating roller 41 rotatably mounted on the upper end of the frame 1, a winding rope 42 arranged on the outer wall of the rotating roller 41, and a clamp 43 connected to the end of the winding rope 42. The clamp 43 is located in the inner cavity of the frame 1, and the clamp 43 can be driven to move up and down in the frame 1 by rotating the rotating roller 41. The rotating roller 41 can be driven by a motor drive, which is more convenient to operate. The clamp 43 is a gripper that can grab or release the hammer 3, and can also be a suction cup electromagnet tooling. The clamp 43 of this embodiment is preferably a suction cup electromagnet, and the hammer 3 is made of iron that can be attracted to a magnet. When the power is on, the hammer 3 can be grabbed, and when the power is off, the hammer 3 can be released, so that the hammer 3 falls downward. In order to make the up and down movement of the hammer 3 more stable, a mounting portion 6 is installed in the frame 1, and the mounting portion 6 includes a seat body 61 and an extension rod 62 symmetrically fixed on both sides of the seat body 61, and the hammer 3 is fixed to the seat body 61 by bolts or the like. The inner wall of the frame 1 is symmetrically provided with guide grooves 10 , and the extension rods 62 extend into adjacent guide grooves 10 , respectively, so that the mounting portion 6 can move vertically up and down in the frame 1 .

[0031] Reference Figure 2 and Figure 3 , a support assembly 7 and a positioning assembly 8 are installed in the guide groove 10, and the positioning assembly 8 is used to position the support assembly 7. An unlocking member 9 is installed on the lower surface of the extension rod 62, and the unlocking member 9 is used to release the positioning effect of the positioning assembly 8 on the support assembly 7. When the positioning assembly 8 positions the support assembly 7, the vertical height position of the support assembly 7 is less than the upper end position of the probe rod 2, so it does not affect the hammer 3 hitting the upper end of the probe rod 2. After the hammer 3 hits the probe rod 2, under the action of the unlocking member 9, the positioning assembly 8 releases the positioning of the support assembly 7, and the support assembly 7 can move upward and move to a position higher than the upper end of the probe rod 2. And the displacement of the support assembly 7 moving upward is less than the displacement of the hammer 3 rebounding upward. That is, the extension rod 62 can be supported by the support assembly 7, and then the hammer 3 can be supported. Therefore, under the action of the support assembly 7, after the hammer 3 rebounds upward, it is supported by the support assembly 7, so that the hammer 3 is not easy to hit the probe rod 2 downward.

[0032] Reference Figure 4 and Figure 5The support assembly 7 includes a support rod 71 and locking members 72 installed at both ends of the support rod 71. A driving member 11 is installed between the inner bottom surface of the guide groove 10 and the side wall of the support rod 71, and the driving member 11 provides a force for the support rod 71 to move upward. The positioning assembly 8 is connected to the support rod 71 and positions the support rod 71. When the positioning assembly 8 and the support rod 71 are separated, the driving member 11 drives the support rod 71 to move upward and moves to a position higher than the upper end of the probe rod 2. The support rod 71 is positioned by the locking member 72, so that after the extension rod 62 abuts against the surface of the support rod 71, the support rod 71 will not move downward any further.

[0033] Reference Figure 4 and Figure 5 Furthermore, the two ends of the support rod 71 are provided with receiving grooves 12, and the locking member 72 includes a locking rod 721 slidably installed in the receiving groove 12 and a first elastic member 722 installed in the receiving groove 12. The first elastic member 722 is a spring, one end of which is connected to the inner end surface of the receiving groove 12, and the other end is connected to the end of the locking rod 721. Figure 3 , a clearance groove 13 is provided on the inner wall of the guide groove 10, and the end of the locking rod 721 extends into the clearance groove 13 to limit the upward and downward sliding of the support rod 71. A locking groove 14 is provided on the inner wall at the upper position of the clearance groove 13, and the depth of the locking groove 14 is greater than the depth of the clearance groove 13, that is, a step edge can be formed at the connection position between the locking groove 14 and the clearance groove 13, and the height position of the step edge is higher than the upper end position of the probe rod 2. When the locking rod 721 moves to the position of the locking groove 14, the locking rod 721 is inserted into the locking groove 14 under the action of the first elastic member 722, and the side wall of the locking rod 721 abuts against the step edge, so that the support rod 71 can no longer move downward.

[0034] In order to facilitate the locking rod 721 to slide out of the locking groove 14, a long groove 24 is formed on the side wall of the support rod 71, and the long groove 24 is connected to the receiving groove 12. An extension block 25 is fixed to the side wall of the locking rod 721, and a portion of the extension block 25 exceeds the surface of the support rod 71. By pushing the extension block 25 to slide in the long groove 24, the locking rod 721 can be driven to slide in the receiving groove 12.

[0035] Reference Figure 3 and Figure 4The positioning assembly 8 includes a positioning seat 81 and a positioning block 82 fixed to the surface of the positioning seat 81. An insertion groove 17 is provided on the inner wall of the guide groove 10 on the side facing the inner cavity of the frame 1, and an insertion rod 16 that is slidably inserted into the insertion groove 17 is fixed on the positioning seat 81. In order to improve the stability of the positioning seat 81, two insertion rods 16 can be provided up and down, and the insertion groove 17 corresponds to the insertion rod 16. A second elastic member 18 is installed in the insertion groove 17. The second elastic member 18 is a spring. One end of the spring is connected to the inner end surface of the insertion groove 17, and the other end is connected to the end of the insertion rod 16. The positioning block 82 is fixed to one side of the positioning seat 81 close to the support rod 71, and a positioning groove 15 for the positioning block 82 to be inserted is provided on the side wall of the support rod 71. Under the action of the second elastic member 18, the positioning block 82 abuts against the positioning groove 15, thereby positioning the support rod 71, and at this time the position of the support rod 71 is lower than the position of the upper end of the probe rod 2. Combined with Figure 2 The unlocking member 9 is a triangular block fixed to the lower surface of the extension rod 62. When the extension rod 62 moves downward, the inclined surface of the triangular block can abut against the positioning seat 81 and drive the positioning seat 81 to slide away from the support rod 71, so that the positioning block 82 is disengaged from the positioning groove 15 and the second elastic member 18 is compressed.

[0036] In further reference Figure 3 and Figure 4 The driving member 11 includes a driving rod 111 fixed to the side wall of the support rod 71 and a third elastic member 112 sleeved on the side wall of the driving rod 111. The lower bottom surface of the guide groove 10 is provided with a sliding groove 27, and the driving rod 111 is slidably inserted in the sliding groove 27. The third elastic member 112 is a spring, and one end of the third elastic member 112 abuts against the side wall of the support rod 71, and the other end abuts against the inner bottom surface of the guide groove 10. When the positioning block 82 is inserted into the positioning groove 15, the third elastic member 112 is in a compressed state, thereby increasing the force of the support rod 71 moving upward.

[0037] Further, see Figure 2 and Figure 5, a fixing rod 19 is symmetrically fixed to the side wall of the guide ring 5, and one end of the fixing rod 19 away from the guide ring 5 is fixed to the inner wall of the frame 1. The diameter of the guide ring 5 is larger than the diameter of the probe rod 2, and two abutment blocks 20 are symmetrically installed on the inner wall of the guide ring 5, and the abutment blocks 20 are arc-shaped structures. A fourth elastic member 21 is installed between the abutment blocks 20 and the inner wall of the guide ring 5. The fourth elastic member 21 is a spring, one end of the spring is connected to the inner wall of the guide ring 5, and the other end is connected to the abutment blocks 20. Under the action of the fourth elastic member 21, the abutment block 20 abuts against the side wall of the probe rod 2. The fixing rod 19 is an internal hollow structure, and a resistance rod 22 is slidably installed in the fixing rod 19, and one end of the resistance rod 22 extends into the guide ring 5 and can abut against the side wall of the abutment block 20. The abutment rod 22 can be linked with the driving rod 111. When the abutment rod 22 and the driving rod 111 are matched, one end of the abutment rod 22 abuts against the side wall of the driving rod 111, and the other end abuts against the side wall of the abutment block 20, so that the abutment block 20 is not easy to slide, so the two abutment blocks 20 can keep the probe rod 2 in a vertical state. When the driving rod 111 slides upward, the abutment rod 22 can separate from the abutment block 20, so the vibration generated by the impact of the probe rod 2 can be damped by the fourth elastic member 21. In order to improve the damping effect, rubber pads or damping pads are fixed at the connection positions between the fourth elastic member 21 and the guide ring 5 and the abutment block 20.

[0038] The hollow structure of the fixed rod 19 passes through the frame 1 and is connected to the sliding groove 27. A fifth elastic member 23 is installed in the inner cavity of the fixed rod 19. The fifth elastic member 23 is a spring and is connected between the inner wall of the fixed rod 19 and the abutment rod 22. To this end, an installation space 26 for installing the fifth elastic member 23 can be reserved inside the fixed rod 19, and in order to facilitate installation, the fixed rod 19 can be a half-spliced ​​structure. Under the action of the fifth elastic member 23, one end of the abutment rod 22 can extend into the sliding groove 27. The ends of the driving rod 111 and the abutment rod 22 are both arc structures. When the driving rod 111 moves downward, it can push the abutment rod 22 to slide into the fixed rod 19, and the fifth elastic member 23 is compressed; when the driving rod 111 moves upward, the abutment rod 22 can slide into the sliding groove 27, that is, the abutment rod 22 and the abutment block 20 can be separated.

[0039] The implementation principle of the road material compressive strength testing device of the embodiment of the present application is as follows: when testing, the abutment block 20 abuts against the side wall of the probe rod 2, and the abutment rod 22 abuts against the abutment block 20, so that the abutment block 20 is not easy to move, thereby maintaining an elastic vertical state. When the hammer 3 moves downward and hits the probe rod 2, the positioning block 82 disengages from the positioning slot 15, the support rod 71 can move upward, and the locking rod 721 moves into the locking slot 14, the support rod 71 can no longer move downward, so that the support rod 71 supports the extension rod 62.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A road material compressive strength testing device, comprising a frame (1), a probe rod (2), a hammer (3) and a grab hammer assembly (4); characterized in that: A guide ring (5) is provided at the lower end of the frame (1), the probe (2) passes through the guide ring (5), a mounting portion (6) is slidably connected to the frame (1) in an up-and-down manner, the striker (3) is connected to the mounting portion (6), and the mounting portion (6) can move up and down along with the striker (3); a support assembly (7) and a positioning assembly (8) for positioning the support assembly (7) are provided on the inner wall of the frame (1); when the positioning assembly (8) positions the support assembly (7), the height position of the support assembly (7) is lower than the upper end of the probe (2); when the positioning assembly (8) releases the positioning of the support assembly (7), the support assembly (7) can move upward to a position higher than the upper end of the probe (2); The lower end of the mounting portion (6) is provided with an unlocking member (9). When the striker (3) moves downward and strikes the upper end of the probe rod (2), the unlocking member (9) can release the positioning of the support member (7) by the positioning assembly (8). After the support assembly (7) moves upward, it can support the mounting portion (6) so that a gap exists between the striker (3) and the probe rod (2).

2. A road material compressive strength testing device according to claim 1, characterized in that: The inner wall of the frame (1) is symmetrically provided with guide grooves (10); the mounting portion (6) comprises a seat body (61) and an extension rod (62) symmetrically arranged on a side wall of the seat body (61); the extension rod (62) extends into the guide groove (10); the positioning assembly (8) and the support assembly (7) are installed in the guide groove (10), and the unlocking member (9) is installed on the lower surface of the extension rod (62).

3. A road material compressive strength testing device according to claim 2, characterized in that: The support assembly (7) comprises a support rod (71) located in the guide groove (10) and locking members (72) arranged at both ends of the support rod (71); the positioning assembly (8) positions the support rod (71); a driving member (11) is arranged between the lower end of the guide groove (10) and the support rod (71); when the positioning assembly (8) releases the positioning of the support rod (71), the driving member (11) drives the support rod (71) to move upward, and the locking member (72) positions the support rod (71), so that the support rod (71) supports the mounting portion (6).

4. A road material compressive strength testing device according to claim 3, characterized in that: The support rod (71) has accommodating grooves (12) at both ends, the locking member (72) comprises a locking rod (721) slidably arranged in the accommodating groove (12) and a first elastic member (722) arranged in the accommodating groove (12), the inner wall of the accommodating groove (12) is provided with a clearance groove (13) for the locking rod (721) to slide up and down, and a locking groove (14) is provided in the clearance groove (13), the depth of the locking groove (14) is greater than the depth of the clearance groove (13), when the support rod (71) moves upward and drives the locking rod (721) to move to the position of the locking groove (14), the first elastic member (722) drives the locking rod (721) to be inserted into the locking groove (14).

5. A road material compressive strength testing device according to claim 4, characterized in that: The positioning assembly (8) comprises a positioning seat (81) and a positioning block (82) arranged on the positioning seat (81); a positioning groove (15) for inserting the positioning block (82) is provided on a side wall of the support rod (71); an inserting groove (17) is provided on an inner wall of the guide groove (10); an inserting rod (16) slidably inserted into the inserting groove (17) is provided on the positioning seat (81), and a second elastic member (18) is provided in the inserting groove (17); under the action of the second elastic member (18), the positioning block (82) is inserted into the positioning groove (15); when the mounting portion (6) moves downward, the unlocking member (9) drives the positioning seat (81) to move in a direction away from the support rod (71), the second elastic member (18) is compressed, and the positioning block (82) slides out of the positioning groove (15).

6. A road material compressive strength testing device according to claim 5, characterized in that: The driving member (11) comprises a driving rod (111) arranged on the side wall of the support rod (71) and a third elastic member (112) arranged on the side wall of the driving rod (111); a sliding groove (27) is provided on the inner bottom surface of the guide groove (10), the driving rod (111) is slidably inserted in the sliding groove (27), and one end of the third elastic member (112) abuts against the side wall of the support rod (71), and the other end abuts against the inner bottom surface of the guide groove (10); when the positioning block (82) abuts against the positioning groove (15), the third elastic member (112) is in a compressed state.

7. A road material compressive strength testing device according to claim 6, characterized in that: A fixing rod (19) is symmetrically arranged on the side wall of the guide ring (5), and one end of the fixing rod (19) away from the guide ring (5) is connected to the inner wall of the frame (1); an abutment block (20) is symmetrically arranged on the inner wall of the guide ring (5), and a fourth elastic member (21) is arranged between the abutment block (20) and the inner wall of the guide ring (5); under the action of the fourth elastic member (21), the abutment block (20) abuts against the side wall of the probe rod (2); a resisting rod (22) is slidably connected in the fixing rod (19), one end of the resisting rod (22) extends in the guide ring (5) and abuts against a side of the abutment block (20) away from the probe rod (2), and the other end of the resisting rod (22) is linked to the driving rod (111), and when the driving rod (111) slides upward, the end of the resisting rod (22) is separated from the abutment block (20).

8. A road material compressive strength testing device according to claim 7, characterized in that: The sliding groove (27) extends vertically downward, one end of the resistance rod (22) passes through the surface of the frame (1) and extends into the sliding groove (27), a fifth elastic member (23) is provided between the inner wall of the fixing rod (19) and the resistance rod (22), the end of the resistance rod (22) abuts against the end of the driving rod (111) so that the resistance rod (22) abuts against the abutment block (20), and when the driving rod (111) slides upward, the fifth elastic member (23) drives the resistance rod (22) to slide in a direction away from the abutment block (20).

9. A road material compressive strength testing device according to claim 4, characterized in that: The side wall of the support rod (71) is provided with a long groove (24) which is connected to the receiving groove (12), and the side wall of the locking rod (721) is provided with an extension block (25) which passes through the long groove (24); when the locking rod (721) slides in the receiving groove (12), the extension block (25) slides in the long groove (24).

10. A road material compressive strength testing device according to any one of claims 1 to 9, characterized in that: The grab hammer assembly (4) comprises a rotating roller (41) rotatably arranged at the upper end of the frame (1), a winding rope (42) arranged on the side wall of the rotating roller (41), and a clamp (43) arranged at the lower end of the winding rope (42); the clamp (43) is located in the frame (1) and is used to grab or release the striker (3).

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