Adjustable multi-tool-position guide rail mounting hole machining equipment

Abstract

The invention provides adjustable multi-cutter-position guide rail mounting hole machining equipment, and relates to the field of numerical control machine tool guide rail machining, and the adjustable multi-cutter-position guide rail mounting hole machining equipment comprises a positioning supporting table, a limiting mounting seat, a sliding mounting seat, a positioning mounting plate, a position adjusting electric push rod, an audible and visual alarm, a limiting mounting rod, a hole diameter detection rod and a sliding contact rod; the limiting mounting seat is fixedly connected to the rear side of the positioning supporting table; the sliding mounting seat is connected above the limiting mounting seat in a sliding manner; the positioning mounting plate is fixedly connected to the front side of the sliding mounting seat; the position adjusting electric push rod is in bolted connection with the left side of the positioning mounting plate; the audible and visual alarm is in bolted connection with the upper part of the positioning mounting plate; the limiting mounting rod is fixedly connected to the lower part of a position adjusting electric push rod piston rod; the aperture detection rod is in threaded connection with the lower part of the limiting mounting rod; according to the device, inconvenience caused by regular inspection of the abrasion degree of the cutter is avoided, a large amount of time is saved, and the problem that it needs to consume a long time to inspect the cutter is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machine tool guide rail processing, and particularly relates to an adjustable multi-tool-position guide rail mounting hole processing device. Background Art

[0002] When machining the mounting holes of a numerical control machine tool guide rail, it is necessary to first fix the guide rail to be machined on the processing table using clamping plates, and then control the movement of the processing table fixing the guide rail through a program until the drilling position aligns with the tool. At this time, the device automatically replaces the appropriate tool to drill the mounting hole under the control of the program.

[0003] For example, CN104741656A discloses a linear guide rail drilling machine, which solves the technical problems of complex structure and high manufacturing cost in the prior art. It includes a machine base and a workpiece positioning assembly arranged on the machine base. The workpiece positioning assembly is slidably connected to the machine base, and an intermittent driving mechanism capable of driving the workpiece positioning assembly to move intermittently along a straight line is connected to the workpiece positioning assembly. An elevating drill bit assembly is arranged above the workpiece positioning assembly on the machine base. The workpiece positioning assembly includes a workpiece positioning seat slidably connected to the machine base. A strip-shaped positioning step and several pressing blocks are arranged on the workpiece positioning seat. An auxiliary positioning mechanism capable of assisting in positioning the linear guide rail before the linear guide rail is placed between the positioning step and the pressing block and the pressing block approaches the positioning step is also arranged on the workpiece positioning seat. The present invention has a simple structure, firmly fixes the linear guide rail, is convenient for drilling processing, and improves work efficiency.

[0004] However, the tool will wear after long-term use, resulting in a smaller aperture of the machined mounting hole. Therefore, the staff needs to regularly check the wear degree of the tool. However, checking the tool takes a long time, which not only causes a large labor burden on the staff but also results in a long downtime of the equipment, affecting the processing efficiency of the guide rail mounting hole. Summary of the Invention

[0005] In view of this, the present invention provides an adjustable multi-tool-position guide rail mounting hole processing device, which is convenient for processing mounting holes of guide rails with different thicknesses. By changing the position of the sliding mounting plate, it is convenient to process mounting holes at different positions of the guide rail, effectively ensuring the applicability of the processing device. By means of the anti-slip rubber pad, the friction force received by the guide rail is increased, effectively ensuring the stability of the guide rail during the process of processing the mounting hole of the guide rail, avoiding the deviation of the position of the mounting hole, and at the same time avoiding the damage of the tool caused by the movement of the guide rail, ensuring the service life of the tool. By the cooperation of the hole diameter detection rod and the sliding contact rod, the hole diameter of the guide rail mounting hole is automatically detected. When the hole diameter is too small due to tool wear, the processing device will stop working, enabling the staff to replace the worn tool in time, and at the same time avoiding the inconvenience of regularly checking the tool wear degree, reducing the labor burden of the staff, saving a lot of time, reducing the downtime of the equipment, improving the processing efficiency of the guide rail mounting hole, and at the same time avoiding the situation of a large number of defective products due to untimely inspection, effectively avoiding the situation of reworking the defective products.

[0006] The present invention provides an adjustable multi-tool-position guide rail mounting hole processing device, which specifically includes: a positioning support table, a limit mounting seat, a sliding mounting seat, a position adjustment structure, a clamping structure, a positioning mounting plate, a position adjustment electric push rod, an audible and visual alarm, a limit mounting rod, a detection structure, a hole diameter detection rod and a sliding contact rod; the limit mounting seat is fixedly connected to the rear side of the positioning support table; the sliding mounting seat is slidably connected up and down above the limit mounting seat; the position adjustment structure is arranged on the upper part of the positioning support table; the clamping structure is arranged on the upper part of the positioning support table; a plurality of threaded holes are evenly distributed on the right side of the positioning mounting plate, and the positioning mounting plate is fixedly connected to the front side of the sliding mounting seat by bolts; the position adjustment electric push rod is bolted to the left side of the positioning mounting plate; the audible and visual alarm is bolted to the upper part of the positioning mounting plate; the limit mounting rod is fixedly connected to the lower part of the piston rod of the position adjustment electric push rod; the detection structure is arranged on the lower part of the limit mounting rod; the hole diameter detection rod is threadedly connected to the lower part of the limit mounting rod; two sliding contact rods are provided, and both of the two sliding contact rods are slidably connected to the lower part of the hole diameter detection rod.

[0007] Further, the clamping structure includes a sliding mounting plate and a limit linear module; a guide chute is respectively opened on the left and right sides of the positioning support table, and the sliding mounting plate is slidably connected back and forth inside the guide chute; the limit linear module is bolted to the upper part of the sliding mounting plate, and a slider is slidably connected to the upper part of the limit linear module.

[0008] Further, the clamping structure further includes a positioning processing table and a position adjustment screw rod; the positioning processing table is fixedly connected to the upper end surface of the slider; there are two position adjustment screw rods, and the two position adjustment screw rods are respectively rotatably connected to the left and right sides of the positioning processing table.

[0009] Further, the clamping structure further includes a fixed clamping plate, an anti-slip rubber pad, and a sliding clamping plate; the fixed clamping plate is fixedly connected to the rear side of the positioning processing table; there are two sliding clamping plates, and the two sliding clamping plates are respectively slidably connected to the left and right sides of the positioning processing table in the front-rear direction, and the two sliding clamping plates are respectively threadedly connected to the two position adjustment screw rods; there are multiple anti-slip rubber pads, and the multiple anti-slip rubber pads are respectively fixedly connected to the front end surface of the fixed clamping plate or the rear end surfaces of the two sliding clamping plates.

[0010] Further, the position adjustment structure includes a limit connecting plate and a second limit electric push rod; the second limit electric push rod is bolted to the front side of the limit mounting seat; the limit connecting plate is fixedly connected to the front part of the piston rod of the second limit electric push rod.

[0011] Further, the position adjustment structure further includes a guiding connecting rod and a first limit electric push rod; the guiding connecting rod is fixedly connected to the rear side of the limit mounting seat; the first limit electric push rod is bolted to the lower part of the sliding mounting seat, and the piston rod of the first limit electric push rod is fixedly connected to the guiding connecting rod; a hydraulic cylinder is bolted to the front side of the sliding mounting seat, a rotary table is fixedly connected to the lower part of the hydraulic cylinder, a tool mounting seat is bolted to the lower part of the rotary table, and multiple tools are fixedly connected to the lower part of the tool mounting seat in a circumferential array.

[0012] Further, the detection structure includes a limit extrusion inclined block and a first reset elastic member; the limit extrusion inclined block is slidably connected to the lower part of the hole diameter detection rod in the up-down direction; the limit extrusion inclined block is elastically connected to the hole diameter detection rod through the first reset elastic member.

[0013] Further, the detection structure further includes a metal contact rod and a metal contact plate; the metal contact rod is fixedly connected to the upper part of the limit extrusion inclined block; there are two metal contact plates, and the two metal contact plates are both fixedly connected to the lower part of the hole diameter detection rod.

[0014] Further, the detection structure further includes a second reset elastic member and a limit compression inclined block; there are two limit compression inclined blocks, and the two limit compression inclined blocks are respectively fixedly connected to the inner sides of the two sliding contact rods; there are two second reset elastic members, and the two limit compression inclined blocks are elastically connected to the hole diameter detection rod through the two second reset elastic members.

[0015] Beneficial effects In the present invention, by adjusting the height of the tool, it is convenient to machine the mounting holes of guide rails with different thicknesses. By changing the position of the sliding mounting plate, it is convenient to machine the mounting holes at different positions of the guide rail, effectively ensuring the applicability of the processing equipment. By means of the anti-slip rubber pad, the friction force received by the guide rail is increased, effectively ensuring the stability of the guide rail during the process of machining the mounting holes of the guide rail, avoiding the deviation of the mounting hole position, and at the same time avoiding the damage of the tool caused by the movement of the guide rail, ensuring the service life of the tool. Through the cooperation of the aperture detection rod and the sliding contact rod, the aperture of the mounting hole of the guide rail is automatically detected. When the aperture is too small due to tool wear, the processing equipment will stop working, enabling the staff to replace the worn tool in time, at the same time avoiding the inconvenience of regularly checking the tool wear degree, reducing the labor burden of the staff, saving a large amount of time, reducing the downtime of the equipment, improving the processing efficiency of the mounting holes of the guide rail, and at the same time avoiding the situation of a large number of defective products caused by untimely inspection, effectively avoiding the situation of reworking the defective products. Brief description of the drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0017] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0018] In the drawings: Figure 1 is the schematic diagram of the overall structure of the present invention.

[0019] Figure 2 is the schematic diagram of the positional relationship between the sliding mounting plate and the limit mounting seat of the present invention.

[0020] Figure 3 is the exploded structure schematic diagram of the limit mounting seat and the sliding mounting seat of the present invention.

[0021] Figure 4 is the schematic diagram of the installation position of the second limit electric push rod of the present invention.

[0022] Figure 5 is the schematic diagram of the positional relationship between the positioning processing table, the sliding clamping plate and the position adjustment lead screw of the present invention.

[0023] Figure 6 is the schematic diagram of the positional relationship between the limit mounting rod, the aperture detection rod and the sliding contact rod of the present invention.

[0024] Figure 7 is the cross-sectional structure schematic diagram of the aperture detection rod of the present invention.

[0025] Figure 8 It is a schematic diagram of the split structure of the aperture detection rod and the sliding contact rod of the present invention.

[0026] List of reference numerals 1. Positioning support table; 101. Sliding mounting plate; 102. Limiting linear module; 103. Positioning machining table; 104. Fixed clamping plate; 105. Anti-slip rubber pad; 106. Position adjustment screw rod; 107. Sliding clamping plate; 2. Limiting mounting seat; 201. Limiting connecting plate; 202. Guide connecting rod; 203. First limiting electric push rod; 204. Second limiting electric push rod; 3. Sliding mounting seat; 4. Positioning mounting plate; 5. Position adjustment electric push rod; 6. Acousto-optic alarm; 7. Limiting mounting rod; 8. Aperture detection rod; 801. Limiting extrusion inclined block; 802. First reset elastic member; 803. Metal contact rod; 804. Metal contact plate; 9. Sliding contact rod; 901. Second reset elastic member; 902. Limiting pressure-receiving inclined block. Detailed implementation manners

[0027] Embodiment 1: Please refer to Figures 1 to 5 as shown in The present invention provides an adjustable multi-tool-position guide rail mounting hole machining device, including a positioning support table 1, a limiting mounting seat 2, a sliding mounting seat 3, a position adjustment structure and a clamping structure; the limiting mounting seat 2 is fixedly connected to the rear side of the positioning support table 1; the sliding mounting seat 3 is slidably connected up and down above the limiting mounting seat 2; the position adjustment structure is arranged on the upper part of the positioning support table 1; the clamping structure is arranged on the upper part of the positioning support table 1.

[0028] Among them, the clamping structure includes a sliding mounting plate 101 and a limiting linear module 102; a guiding chute is respectively opened on the left and right sides of the positioning support table 1, and the sliding mounting plate 101 is slidably connected back and forth inside the guiding chute; the limiting linear module 102 is bolted to the upper part of the sliding mounting plate 101, and a slider is slidably connected to the upper part of the limiting linear module 102.

[0029] Among them, the clamping structure further includes a positioning machining table 103 and a position adjustment screw rod 106; the positioning machining table 103 is fixedly connected to the upper end surface of the slider; two position adjustment screw rods 106 are provided, and the two position adjustment screw rods 106 are respectively rotatably connected to the left and right sides of the positioning machining table 103.

[0030] Among them, the clamping structure further includes a fixed clamping plate 104, an anti-slip rubber pad 105, and a sliding clamping plate 107; the fixed clamping plate 104 is fixedly connected to the rear side of the positioning processing table 103; there are two sliding clamping plates 107, and the two sliding clamping plates 107 are respectively slidably connected to the left and right sides of the positioning processing table 103 in the front and rear directions, and the two sliding clamping plates 107 are respectively threadedly connected to the two position adjustment lead screws 106; there are multiple anti-slip rubber pads 105, and the multiple anti-slip rubber pads 105 are respectively fixedly connected to the front end face of the fixed clamping plate 104 or the rear end faces of the two sliding clamping plates 107.

[0031] Among them, the position adjustment structure includes a limit connecting plate 201 and a second limit electric push rod 204; the second limit electric push rod 204 is bolted to the front side of the limit mounting seat 2; the limit connecting plate 201 is fixedly connected to the front part of the piston rod of the second limit electric push rod 204.

[0032] Among them, the position adjustment structure further includes a guiding connecting rod 202 and a first limit electric push rod 203; the guiding connecting rod 202 is fixedly connected to the rear side of the limit mounting seat 2; the first limit electric push rod 203 is bolted to the lower part of the sliding mounting seat 3, and the piston rod of the first limit electric push rod 203 is fixedly connected to the guiding connecting rod 202; a hydraulic cylinder is bolted to the front side of the sliding mounting seat 3, a rotary table is fixedly connected to the lower part of the hydraulic cylinder, a tool mounting seat is bolted to the lower part of the rotary table, and multiple tools are fixedly connected to the lower part of the tool mounting seat in a circumferential array.

[0033] The specific usage method and function of this embodiment: Place the numerically controlled machine tool guide rail to be processed on the upper part of the positioning processing table 103, then rotate the position adjustment lead screw 106 to make the sliding clamping plate 107 slide backward along the positioning processing table 103 until the anti-slip rubber pad 105 is completely attached to the guide rail. At this time, the fixed clamping plate 104 and the sliding clamping plate 107 will clamp the guide rail to complete the positioning of the guide rail. At this time, the positioning processing table 103 and the guide rail are driven to slide to the left through the cooperation of the limit linear module 102 and the slider. When the processing position of the guide rail mounting hole is aligned with the tool, the rotary table rotates to replace the appropriate tool to the processing position, and the hydraulic cylinder pushes the rotary table and the tool to move downward to process the mounting hole. The second limit electric push rod 204 will push the limit connecting plate 201 and the sliding mounting plate 101 to slide to change the position of the guide rail. When processing guide rails with different thicknesses, the first limit electric push rod 203 acts to make the sliding mounting seat 3 slide upward along the guiding connecting rod 202 on the upper part of the limit mounting seat 2 to change the initial height of the tool.

[0034] Embodiment Two: As Figures 6 to 8 shown: On the basis of the first embodiment, it further includes a positioning mounting plate 4, a position adjustment electric push rod 5, an audible and visual alarm 6, a limit mounting rod 7, a detection structure, a hole diameter detection rod 8, and a sliding contact rod 9; a plurality of threaded holes are evenly distributed on the right side of the positioning mounting plate 4, and the positioning mounting plate 4 is fixedly connected to the front side of the sliding mounting seat 3 by bolts; the position adjustment electric push rod 5 is bolted to the left side of the positioning mounting plate 4; the audible and visual alarm 6 is bolted to the upper part of the positioning mounting plate 4; the limit mounting rod 7 is fixedly connected to the lower part of the piston rod of the position adjustment electric push rod 5; the detection structure is arranged at the lower part of the limit mounting rod 7; the hole diameter detection rod 8 is threadedly connected to the lower part of the limit mounting rod 7; there are two sliding contact rods 9, and both of the two sliding contact rods 9 are slidably connected to the lower part of the hole diameter detection rod 8.

[0035] Among them, the detection structure includes a limit extrusion inclined block 801 and a first reset elastic member 802; the limit extrusion inclined block 801 is slidably connected up and down to the lower part of the hole diameter detection rod 8; the limit extrusion inclined block 801 is elastically connected to the hole diameter detection rod 8 through the first reset elastic member 802.

[0036] Among them, the detection structure further includes a metal contact rod 803 and a metal contact plate 804; the metal contact rod 803 is fixedly connected to the upper part of the limit extrusion inclined block 801; there are two metal contact plates 804, and both of the two metal contact plates 804 are fixedly connected to the lower part of the hole diameter detection rod 8.

[0037] Among them, the detection structure further includes a second reset elastic member 901 and a limit compression inclined block 902; there are two limit compression inclined blocks 902, and the two limit compression inclined blocks 902 are respectively fixedly connected to the inner sides of the two sliding contact rods 9; there are two second reset elastic members 901, and the two limit compression inclined blocks 902 are elastically connected to the hole diameter detection rod 8 through the two second reset elastic members 901.

[0038] Specific usage and functions of this embodiment: After the machined mounting holes of the guide rail are moved below the positioning mounting plate 4, the position-adjusting electric push rod 5 will push the limit mounting rod 7 and the hole diameter detecting rod 8 downward, so that the hole diameter detecting rod 8 is inserted into the machined mounting hole of the guide rail. At this time, the limit extrusion inclined block 801 will be limited by the positioning machining table 103 and cannot move downward continuously. Continuing to push the hole diameter detecting rod 8 downward can make the limit extrusion inclined block 801 extrude the limit pressure-receiving inclined block 902. After the limit pressure-receiving inclined block 902 is pressed, it will make the sliding contact rod 9 slide outward. When the sliding contact rod 9 just contacts the inner wall of the mounting hole, the metal contact rod 803 will touch the metal contact plate 804. At this time, the circuit of the sound and light alarm 6 is connected to send a signal. The position-adjusting electric push rod 5 drives the hole diameter detecting rod 8 to reset, and the first reset elastic member 802 and the second reset elastic member 901 drive the limit extrusion inclined block 801 and the sliding contact rod 9 to reset. The tool continues to machine the next mounting hole. If the hole diameter of the mounting hole is too small, the sliding distance of the sliding contact rod 9 becomes smaller, and the limit extrusion inclined block 801 will be limited by the limit pressure-receiving inclined block 902. At this time, the metal contact rod 803 cannot touch the metal contact plate 804, and at this time, the control system will not receive signal feedback, and the tool will not machine the next mounting hole.

[0039] In this article, the following points need to be noted: 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0040] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0041] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An adjustable multi-tool-position guide rail mounting hole processing device, comprising a positioning support table (1), a limit mounting seat (2), a sliding mounting seat (3), a position adjustment structure, a clamping structure, a positioning mounting plate (4), a position adjustment electric push rod (5), an audible and visual alarm (6), a limit mounting rod (7), a detection structure, a hole diameter detection rod (8) and a sliding contact rod (9); the limit mounting seat (2) is fixedly connected to the rear side of the positioning support table (1); the sliding mounting seat (3) is slidably connected up and down above the limit mounting seat (2); characterized in that: The position adjustment structure is arranged on the upper part of the positioning support platform (1); the clamping structure is arranged on the upper part of the positioning support platform (1); a plurality of threaded holes are evenly distributed on the right side of the positioning mounting plate (4), and the positioning mounting plate (4) is fixedly connected to the front side of the sliding mounting seat (3) by bolts; the position adjustment electric push rod (5) is bolted to the left side of the positioning mounting plate (4); the sound and light alarm (6) is bolted to the upper part of the positioning mounting plate (4); the limit mounting rod (7) is fixedly connected to the lower part of the piston rod of the position adjustment electric push rod (5); the detection structure is arranged on the lower part of the limit mounting rod (7); the aperture detection rod (8) is threadedly connected to the lower part of the limit mounting rod (7); two sliding contact rods (9) are provided, and both of the two sliding contact rods (9) are slidably connected to the lower part of the aperture detection rod (8).

2. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 1, characterized in that: The clamping structure includes a sliding mounting plate (101) and a limit linear module (102); a guiding chute is respectively arranged on the left and right sides of the positioning support platform (1), and the sliding mounting plate (101) is slidably connected to the inside of the guiding chute in the front and back directions; the limit linear module (102) is bolted to the upper part of the sliding mounting plate (101), and a slider is slidably connected to the upper part of the limit linear module (102).

3. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 2, characterized in that: The clamping structure further includes a positioning processing table (103) and a position adjustment lead screw (106); the positioning processing table (103) is fixedly connected to the upper end surface of the slider; two position adjustment lead screws (106) are provided, and the two position adjustment lead screws (106) are respectively rotatably connected to the left and right sides of the positioning processing table (103).

4. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 3, wherein: The clamping structure further includes a fixed clamping plate (104), an anti-slip rubber pad (105) and a sliding clamping plate (107); the fixed clamping plate (104) is fixedly connected to the rear side of the positioning processing table (103); two sliding clamping plates (107) are provided, and the two sliding clamping plates (107) are respectively slidably connected to the left and right sides of the positioning processing table (103) in the front and back directions, and the two sliding clamping plates (107) are respectively threadedly connected to the two position adjustment lead screws (106); a plurality of anti-slip rubber pads (105) are provided, and the plurality of anti-slip rubber pads (105) are respectively fixedly connected to the front end surface of the fixed clamping plate (104) or the rear end surfaces of the two sliding clamping plates (107).

5. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 1, characterized in that: The position adjustment structure includes a limit connecting plate (201) and a second limit electric push rod (204); the second limit electric push rod (204) is bolted to the front side of the limit mounting seat (2); the limit connecting plate (201) is fixedly connected to the front part of the piston rod of the second limit electric push rod (204).

6. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 5, characterized in that: The position adjustment structure further includes a guiding connecting rod (202) and a first limit electric push rod (203); the guiding connecting rod (202) is fixedly connected to the rear side of the limit mounting seat (2); the first limit electric push rod (203) is bolted to the lower part of the sliding mounting seat (3), and the piston rod of the first limit electric push rod (203) is fixedly connected to the guiding connecting rod (202); a hydraulic cylinder is bolted to the front side of the sliding mounting seat (3), a rotary table is fixedly connected to the lower part of the hydraulic cylinder, a tool mounting seat is bolted to the lower part of the rotary table, and a plurality of tools are fixedly connected to the lower part of the tool mounting seat in a circumferential array.

7. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 1, characterized in that: The detection structure includes a limit extrusion inclined block (801) and a first reset elastic member (802); the limit extrusion inclined block (801) is slidably connected up and down to the lower part of the hole diameter detection rod (8); the limit extrusion inclined block (801) is elastically connected to the hole diameter detection rod (8) through the first reset elastic member (802).

8. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 7, characterized in that: The detection structure further includes a metal contact rod (803) and a metal contact plate (804); the metal contact rod (803) is fixedly connected to the upper part of the limit extrusion inclined block (801); there are two metal contact plates (804), and both of the two metal contact plates (804) are fixedly connected to the lower part of the hole diameter detection rod (8).

9. The adjustable multi-tool-position guide rail mounting hole processing equipment according to claim 8, characterized in that: The detection structure further includes a second reset elastic member (901) and a limit compression inclined block (902); there are two limit compression inclined blocks (902), and the two limit compression inclined blocks (902) are respectively fixedly connected to the inner sides of the two sliding contact rods (9); there are two second reset elastic members (901), and the two limit compression inclined blocks (902) are elastically connected to the hole diameter detection rod (8) through the two second reset elastic members (901).

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