90-degree assembly testing fixture for railway vehicle assembly
By designing a 90-degree assembly fixture for rail vehicle assembly, and using a sliding rod and a runout gauge to automatically verify the inner and outer diameters of the tubular opening at the upper end of the primary rubber spring of a monorail vehicle, the problems of cumbersome operation and low efficiency in traditional methods are solved, and a fast and accurate inspection result is achieved.
Patent Information
- Application Number
- CN202520415170.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Traditional methods for verifying the inner and outer diameters of the tubular opening at the upper end of the primary rubber spring of a monorail vehicle are cumbersome and inefficient, and it is difficult to simultaneously and accurately detect the eccentricity and roughness of the inner and outer diameters.
A 90-degree assembly fixture for rail vehicle assembly was designed, including a fixture frame, a double-diameter surface contact mechanism, and a runout gauge. The fixture automatically verifies the inner and outer diameters by using a first sliding rod and a second sliding rod to contact the inner diameter stop and outer diameter surface of the tubular opening, respectively. The runout gauge is triggered by a spring sliding and a detection contact rod.
It enables automatic verification of the inner and outer diameters of the tubular opening, and realizes rapid and accurate detection of the inner and outer diameters of the tubular opening at the upper end of the primary rubber spring of a monorail vehicle, thus improving detection efficiency and accuracy.
Smart Images
Figure CN223741433U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the rail vehicle safety wheel manufacturing auxiliary equipment technical field, concretely relates to a 90 degree assembly gauge for rail vehicle assembly. BACKGROUND
[0002] Single track rail vehicle is equipped with a series of rubber springs, and the two ends of the series of rubber springs are metal components. In the processing, casting, cutting, paint spraying, galvanizing and other processes are needed. After the cutting part is cut, paint spraying and anti-oxidation treatment are needed in time. Before paint spraying and anti-oxidation treatment, the inner diameter and outer diameter of the connecting end face of the upper end need to be verified. The main verification is the inner and outer diameter eccentricity and roughness of the tubular port of the upper end of the series of rubber springs. In the traditional verification of the tubular port of the upper end of the series of rubber springs, the verifier measures the diameter of the tubular port of the upper end of the series of rubber springs with a caliper, then holds a dial indicator with one hand and rotates the series of rubber springs with the other hand to check and verify the tubular port of the upper end of the series of rubber springs. Unqualified series of rubber springs are screened out. SUMMARY
[0003] The purpose of the present application is to solve the above problems and provide a 90 degree assembly gauge for rail vehicle assembly.
[0004] A 90 degree assembly gauge for rail vehicle assembly, comprising: a gauge frame, a double-diameter surface contact mechanism, and a dial indicator. The gauge frame is annular, the upper end of the gauge frame is provided with an annular convex stop, and the lower end of the gauge frame is provided with an outer diameter sleeve. At least one lug is provided on the outer diameter of the gauge frame. One side of the gauge frame is provided with a mechanism sliding cavity, the double-diameter surface contact mechanism is arranged in the mechanism sliding cavity, the dial indicator is arranged outside the mechanism sliding cavity, and a detection touch rod is sleeved on the dial indicator. The double-diameter surface contact mechanism is provided with a first sliding rod and a second sliding rod. The end of the first sliding rod can contact the inner wall of the tubular port inner diameter stop. The second sliding rod can contact the outer wall of the tubular port outer diameter vertical surface. The first sliding rod and the second sliding rod slide relative to each other through a spring. The second sliding rod triggers the dial indicator through the detection touch rod. The annular convex stop verifies the tubular port inner diameter stop. The outer diameter sleeve verifies the tubular port outer diameter vertical surface.
[0005] A 90 degree assembly gauge for rail vehicle assembly, comprising: a gauge frame, the gauge frame being an annular member, the upper end of the gauge frame being provided with an annular convex stop, and the lower end of the gauge frame being provided with an outer diameter sleeve. At least one lug is provided on the outer diameter of the gauge frame. The annular convex stop verifies the tubular port inner diameter stop. The outer diameter sleeve verifies the tubular port outer diameter vertical surface.
[0006] The gauge frame is a single-lug gauge frame or a double-lug gauge frame.
[0007] The gauge frame further comprises a double-diameter surface contact mechanism and a runout gauge, one side of the gauge frame is provided with a mechanism sliding cavity, the double-diameter surface contact mechanism is arranged in the mechanism sliding cavity, the runout gauge is arranged outside the mechanism sliding cavity, and a detection touch rod is sleeved on the runout gauge; the double-diameter surface contact mechanism is provided with a first sliding rod and a second sliding rod; the first sliding rod is capable of contacting the inner wall of the tubular port inner diameter stop; the second sliding rod is capable of contacting the outer wall of the tubular port outer diameter vertical surface; the first sliding rod and the second sliding rod are relatively slid by a spring, and the second sliding rod triggers the runout gauge by the detection touch rod.
[0008] The gauge frame is a diameter surface detection type gauge frame; the diameter surface detection type gauge frame comprises a first gauge frame and a second gauge frame, the first gauge frame and the second gauge frame can be butted to form an annular member, and an ear along and a mechanism sliding cavity are arranged on the two sides of the diameter surface detection type gauge frame.
[0009] The axial line of the mechanism sliding cavity is on the normal line of the diameter surface detection type gauge frame; a gear connecting shaft is arranged in the middle of the mechanism sliding cavity, the axial line of the gear connecting shaft is on the normal line of the mechanism sliding cavity; an upper top rod sliding hole is arranged at the upper end of one side of the mechanism sliding cavity, a lower top rod first sliding hole and a lower top rod second sliding hole are arranged at the lower end of one side of the mechanism sliding cavity; the upper top rod sliding hole and the first sliding hole are in communication with the mechanism sliding cavity; one end of the upper top rod sliding hole is in communication with the outer end surface of the annular convex stop; one end of the first sliding hole is in communication with the inner diameter surface of the double-diameter surface gauge outer diameter sleeve; and the lower top rod second sliding hole is arranged on one side of the mechanism sliding cavity.
[0010] The double-diameter surface contact mechanism comprises a first contact sliding frame, a second contact sliding frame and a gear; the first contact sliding frame and the second contact sliding frame are the same in structure, and are both S-shaped members; the first contact sliding frame and the second contact sliding frame are both provided with a stop plate, a rack and a sliding rod; the stop plate is connected by the rack and the sliding rod; the gear is meshed with the racks on the two contact sliding frames at the upper end and the lower end; the stop plate is supported by a spring; the first sliding rod is the sliding rod on the first contact sliding frame; the second sliding rod is the sliding rod on the second contact sliding frame; the first sliding rod is sleeved in the upper top rod sliding hole; and the second sliding rod is sleeved in the lower top rod first sliding hole.
[0011] The runout gauge is a runout detector, a gauge rod is arranged on one side of the runout gauge, the gauge rod is sleeved in the lower top rod second sliding hole; the gauge rod is a tubular member, a detection touch rod is sleeved in the gauge rod, and the end of the detection touch rod abuts against the end surface of the stop plate of the first contact sliding frame.
[0012] The technical scheme provides a 90-degree assembly gauge for assembling a rail vehicle, which comprises a gauge frame, a double-diameter surface contact mechanism and a runout gauge, the gauge frame is annular, an annular convex stop is arranged at the upper end of the gauge frame, and an outer diameter sleeve opening is arranged at the lower end of the gauge frame; a mechanism sliding cavity is arranged on one side of the gauge frame, the double-diameter surface contact mechanism is arranged in the mechanism sliding cavity, the runout gauge is arranged outside the mechanism sliding cavity, and a detection contact rod is sleeved on the runout gauge; the double-diameter surface contact mechanism is provided with a first sliding rod and a second sliding rod; the end of the first sliding rod can be in contact with the inner wall of the inner diameter stop of the tubular opening; the second sliding rod can be in contact with the outer wall of the outer diameter vertical surface of the tubular opening; the first sliding rod and the second sliding rod are relatively slid through a spring, and the second sliding rod triggers the runout gauge through the detection contact rod; the annular convex stop verifies the inner diameter stop of the tubular opening; the outer diameter sleeve opening verifies the outer diameter vertical surface of the tubular opening; and the runout gauge verifies the inner diameter and the outer diameter of the tubular opening arranged at the upper end of a series of rubber springs through the double-diameter surface contact mechanism. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a single-ear gauge overall schematic view of the 90-degree assembly gauge for assembling a rail vehicle;
[0014] Figure 2 is a double-ear gauge overall schematic view of the 90-degree assembly gauge for assembling a rail vehicle;
[0015] Figure 3 is a double-ear gauge partial sectional view of the 90-degree assembly gauge for assembling a rail vehicle;
[0016] Figure 4 is a double-diameter surface precision gauge overall schematic view of the 90-degree assembly gauge for assembling a rail vehicle;
[0017] Figure 5 is a double-diameter surface precision gauge partial view of the 90-degree assembly gauge for assembling a rail vehicle;
[0018] Figure 6 is a double-diameter surface precision gauge frame body partial view of the 90-degree assembly gauge for assembling a rail vehicle;
[0019] Figure 7 is a double-diameter surface contact mechanism schematic view of the 90-degree assembly gauge for assembling a rail vehicle;
[0020] Figure 8 is a double-diameter surface precision gauge use state view of the 90-degree assembly gauge for assembling a rail vehicle;
[0021] Figure 9 is a double-diameter surface precision gauge use state partial view of the 90-degree assembly gauge for assembling a rail vehicle;
[0022] Fig. 11, first annular convex stop, 12, first ear, 121, first optical axis through hole, 21, second annular convex stop, 22, second gauge outer diameter sleeve, 23, second ear, 231, second optical axis through hole, 3, radial surface detection type gauge frame, 31, first gauge frame, 32, second gauge frame, 33, third annular convex stop, 34, double radial surface gauge outer diameter sleeve, 35, third ear, 351, third optical axis through hole, 36, mechanism sliding cavity, 361, gear connecting shaft, 362, upper sliding part, 363, upper ejector rod sliding hole, 364, lower sliding part, 365, lower ejector rod first sliding hole, 366, lower ejector rod second sliding hole, 41, first contact sliding frame, 411, first stop plate, 412, first rack, 413, first sliding rod, 42, second contact sliding frame, 421, second stop plate, 422, second rack, 423, second sliding rod, 43, gear, 44, first spring, 45, second spring, 5, runout table, 51, table rod, 52, detection touch rod, 9, tubular port, 91, tubular port inner diameter stop, 92, tubular port outer diameter vertical surface, 93, connecting ear. DETAILED DESCRIPTION
[0023] The upper end of the first rubber spring is provided with a tubular port 9, the inner side of the tubular port is a tubular port inner diameter stop 91, and the outer side of the tubular port is a tubular port outer diameter vertical surface 92; the technical solution is a gauge for checking the tubular port inner diameter stop 91 and the tubular port outer diameter vertical surface 92 of the upper end of the first rubber spring.
[0024] The technical solution will be further clearly and completely described below in combination with the drawings of the technical solution. The described embodiments are only a part of the technical solution, rather than all the embodiments. Based on the technical solution, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the utility model.
[0025] Embodiment 1: a single-ear gauge
[0026] Referring to the drawings, a single-ear gauge is a single-ear gauge frame of an annular metal; Figure 1 The upper end of the single-ear gauge is provided with a first annular convex stop 11;
[0027] The diameter of the first annular convex stop 11 is matched with the diameter of the tubular port inner diameter stop 91 with a very small gap, and the height of the first annular convex stop 11 is the same as the inner sinking height of the tubular port inner diameter stop 91;
[0028] One side of the single-ear gauge is provided with a first ear 12, and the first ear 12 is provided with a first optical axis through hole 121;
[0029] The outer diameter facet 92 of the tubular opening is provided with two connecting lugs 93, and the connecting lugs 93 are provided with lug thread holes; when the first lug 12 corresponds to the connecting lug 93, the first optical axis through hole 121 can correspond to the lug thread hole.
[0030] Example 2: A bilateral ear examination tool
[0031] See appendix Figures 2-3 As shown, one type of binaural fixture is a ring-shaped metal binaural fixture frame; another type of binaural fixture is an extension of the single-ear fixture described in Embodiment 1.
[0032] The aforementioned double-ear instrument has a second annular convex stop 21 at its upper end, and the second annular convex stop 21 has the same structure as the first annular convex stop 11; the second annular convex stop 21 can be fitted into the inner diameter stop 91 of the tubular opening.
[0033] The lower end of the double-eared instrument is provided with a second instrument outer diameter sleeve 22, which can be fitted onto the tubular opening at the upper end of a primary rubber spring; the inner diameter of the second instrument outer diameter sleeve and the outer end face diameter of the tubular opening at the upper end of the primary rubber spring are fitted with a very small gap.
[0034] The double-eared instrument is provided with a second ear edge 23 on both sides, and a second optical axis through hole 231 is provided in the second ear edge 23 on both sides;
[0035] The outer diameter facet 92 of the tubular opening is provided with two connecting lugs 93, and the angle difference between the two connecting lugs 93 on the double lug gauge is 150 degrees; the connecting lugs 93 are provided with lug thread holes; when the two second lugs 23 correspond one-to-one with the connecting lugs 93, the two second optical axis through holes 231 can correspond to the two second lug thread holes respectively.
[0036] Example 3: A Dual-Diameter Surface Precision Inspection Fixture
[0037] See appendix Figures 4-7 As shown, a dual-diameter surface precision gauge includes: a diameter surface inspection gauge frame 3, a dual-diameter surface contact mechanism, and a runout gauge 5;
[0038] The radial surface detection fixture 3 includes a first fixture 31 and a second fixture 32. The first fixture 31 and the second fixture 32 are joined together to form a ring-shaped metal component. This ring-shaped metal component has the same fixture frame structure as the single-ear fixture described in Embodiment 1; or the ring-shaped metal component has the same fixture frame structure as the double-ear fixture described in Embodiment 2.
[0039] The radial surface inspection fixture 3 is provided with a third annular convex stop 33 at the upper end; the radial surface inspection fixture 3 is provided with a double radial surface inspection fixture outer diameter sleeve 34 at the lower end;
[0040] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0041] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0042] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0043] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0044] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0045] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0046] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0047] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0048] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0049] The first gauge frame 31 is provided with a third lug flabⅠon one side, and the second gauge frame 32 is provided with a third lug flabⅡon the other side. The third lug flabⅠand the third lug flabⅡcan be connected to form a third lug flab 35. The third lug flab 35 is provided with a third optical axis through hole 351.
[0050] The first contact sliding frame 41 is an S-shaped component, the right side of the first contact sliding frame 41 is provided with a first abutting plate 411, the left side of the first abutting plate 411 is provided with a first rack 412, the other end of the first rack 412 is provided with a first T-shaped sliding block, and the top of the first T-shaped sliding block is a first sliding rod 413;
[0051] The first contact sliding frame 41 and the second contact sliding frame 42 are the same in structure; that is, the left side of the second contact sliding frame 42 is provided with a second abutting plate 421, the right side of the second abutting plate 421 is provided with a second rack 422, the other end of the second rack 422 is provided with a T-shaped sliding block, and the top of the T-shaped sliding block is a second sliding rod 423;
[0052] The first abutting plate 411 and the second abutting plate 421 are both semicircular, the first abutting plate 411 is sleeved on the left side in the mechanism sliding cavity 36, and the second abutting plate 421 is sleeved on the right side in the mechanism sliding cavity 36;
[0053] The gear 43 is sleeved on the gear connecting shaft 361, the upper and lower ends of the gear 43 are respectively engaged with the first rack 412 and the second rack 422, and the first spring 44 and the second spring 45 are respectively abutted on the two sides of the gear connecting shaft 361;
[0054] The first spring 44 and the second spring 45 are both compression springs, and the first contact sliding frame 41 and the second contact sliding frame 42 are supported by the two springs; the top ends of the first sliding rod 413 and the second sliding rod 423 protrude from the vertical end face through the two springs.
[0055] The bounce meter 5 is a bounce detector, one side of the bounce meter 5 is provided with a meter rod 51, the meter rod 51 is sleeved in the lower top rod second sliding hole 366, the meter rod 51 is a tubular component, a detection touch rod 52 is sleeved in the meter rod 51, and the end of the detection touch rod 52 abuts on the left end face of the first abutting plate 411.
[0056] Usage:
[0057] Referring to FIGS. 1 to 5, Figure 8 and 9 When in use, the radial surface detection type testing fixture frame 3 can be used to statically or dynamically monitor and verify the tubular port on the upper end of a series of rubber springs;
[0058] The third annular convex stop port 33 above the radial surface detection type testing fixture frame 3 is sleeved in the tubular port inner diameter stop port 91, after sleeving, the radial surface detection type testing fixture frame 3 is rotated, the radial surface of the inner diameter of the tubular port inner diameter stop port 91 is verified, and when the radial surface of the inner diameter of the tubular port inner diameter stop port 91 is abnormal, the abnormal radial surface triggers the bounce meter 5;
[0059] The double-diameter detection gauge outer diameter sleeve 34 of the radial surface detection gauge frame 3 below is sleeved on the tubular port outer diameter vertical surface 92, after the sleeve, the radial surface detection gauge frame 3 is rotated, the outer vertical surface of the tubular port outer diameter vertical surface 92 is verified, when the outer diameter vertical surface of the tubular port outer diameter vertical surface 92 is abnormal, the abnormal inner diameter vertical surface triggers the runout table 5.
[0060] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A 90-degree assembly gauge for assembling a railway vehicle, characterized by comprising: It includes: The gauge frame is an annular member, the upper end of the gauge frame is provided with an annular convex stop, and the lower end of the gauge frame (3) is provided with an outer diameter sleeve; at least one lug is provided on the outer diameter of the gauge frame; the annular convex stop checks the tubular port inner diameter stop (91); the outer diameter sleeve checks the tubular port outer diameter vertical surface (92).
2. The 90° assembly gauge for assembling a rail vehicle according to claim 1, characterized in that: The gauge frame is a single-lug gauge frame or a double-lug gauge frame.
3. The 90 degree assembly gage for assembling a rail vehicle according to claim 1, wherein: The gauge frame further includes a double-diameter surface contact mechanism, a runout table (5), a mechanism sliding cavity (36) is arranged on one side of the gauge frame, the double-diameter surface contact mechanism is arranged in the mechanism sliding cavity (36), the runout table (5) is arranged outside the mechanism sliding cavity (36), and a detection touch rod (52) is sleeved on the runout table (5); the double-diameter surface contact mechanism is provided with a first sliding rod (413) and a second sliding rod (423); the end of the first sliding rod (413) can be in contact with the inner wall of the tubular port inner diameter stop (91); the second sliding rod (423) can be in contact with the outer wall of the tubular port outer diameter vertical surface (92); the first sliding rod (413) and the second sliding rod (423) relatively slide through a spring, and the second sliding rod (423) triggers the runout table (5) through the detection touch rod (52).
4. The 90° assembly gauge for assembling a rail vehicle according to claim 3, characterized in that: The gauge frame is a diameter surface detection type gauge frame (3); the diameter surface detection type gauge frame (3) includes a first gauge frame (31) and a second gauge frame (32), the first gauge frame (31) and the second gauge frame (32) can be butted to be combined into an annular member, and a lug and a mechanism sliding cavity (36) are arranged on two sides of the diameter surface detection type gauge frame (3) respectively.
5. The 90° assembly gauge for assembling a rail vehicle according to claim 4, characterized in that: The axial line of the mechanism sliding cavity (36) is on the normal line of the diameter surface detection type gauge frame (3); a gear connecting shaft (361) is arranged in the middle of the mechanism sliding cavity (36), the axial line of the gear connecting shaft (361) is on the normal line of the mechanism sliding cavity (36); an upper top rod sliding hole (363) is arranged on the upper end of one side of the mechanism sliding cavity (36), a lower top rod first sliding hole (365) and a lower top rod second sliding hole (366) are arranged on the lower end of one side of the mechanism sliding cavity (36); the upper top rod sliding hole (363) and the first sliding hole (365) are in communication with the mechanism sliding cavity (36); one end of the upper top rod sliding hole (363) penetrates the outer end surface of the annular convex stop; one end of the first sliding hole (365) penetrates the inner diameter surface of the double-diameter surface gauge outer diameter sleeve (34); and the lower top rod second sliding hole (366) is arranged on one side of the diameter surface gauge outer diameter sleeve (34).
6. The 90° assembly gauge for assembling a rail vehicle according to claim 5, characterized in that: The double-diameter surface contact mechanism comprises a first contact sliding frame (41), a second contact sliding frame (42) and a gear (43); the first contact sliding frame (41) and the second contact sliding frame (42) are of the same structure, and both the first contact sliding frame (41) and the second contact sliding frame (42) are S-shaped members; the first contact sliding frame (41) and the second contact sliding frame (42) are both provided with a resisting plate, a rack and a sliding rod; the resisting plate is connected through the rack and the sliding rod; the gear (43) is engaged with the racks on the two contact sliding frames at the upper end and the lower end respectively; the spring supports the resisting plate; the first sliding rod (413) is the sliding rod on the first contact sliding frame (41); the second sliding rod (423) is the sliding rod on the second contact sliding frame (42); the first sliding rod (413) is sleeved in the upper top rod sliding hole (363); the second sliding rod (423) is sleeved in the lower top rod first sliding hole (365).
7. The 90° assembly gauge for assembling a rail vehicle according to claim 6, characterized in that: The jumping table (5) is a jumping detector, and one side of the jumping table (5) is provided with a table rod (51); the table rod (51) is sleeved in the lower top rod second sliding hole (366); the table rod (51) is a tubular member, a detection touch rod (52) is sleeved in the table rod (51), and the end of the detection touch rod (52) abuts against the end face of the resisting plate of the first contact sliding frame (41).