Detection device for inner star wheel

Abstract

The invention relates to a detection device for an inner star wheel, which comprises a supporting table and a positioning module arranged at the top of the supporting table, and is characterized in that the supporting table comprises a table plate and a supporting plate which are transversely arranged and are respectively distributed up and down, and a plurality of stand columns which are vertically fixed between the supporting plate and the table plate; the positioning module comprises a seat block and a cushion block which are fixed at the top of the bedplate and are respectively arranged front and back, a filler block fixed at the top of the cushion block, a pressing block fixed at the top of the filler block, and a reference backer ball fixed at the front side of the filler block and positioned between the pressing block and the cushion block; the first detection module and the second detection module are matched with each other; the system further comprises a steering module. According to the invention, the operation steps are simplified, so that the time-saving and labor-saving effects are achieved; moreover, automatic transposition can be realized by virtue of the steering module, so that the working efficiency is improved; meanwhile, the use is convenient; in addition, the steering module can be matched with inner star wheels with different shaft hole inner diameter specifications, so that the application range is widened, and good universality is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection fixture, in particular to a detection device for inner star wheel. BACKGROUND

[0002] The inner star wheel is a core component in the automobile transmission system, and is an important part of the constant velocity joint. The main function is to transmit power from the transmission to the two front wheels to drive the vehicle to run at high speed. The performance directly affects the safety and reliability of the transmission system. The outer part of the inner star wheel has a plurality of ball channel grooves evenly arranged at equal angles in the circumferential direction. After processing, the inner star wheel needs to detect a plurality of spatial geometric dimensions of each ball channel groove to ensure the installation accuracy, including the center distance deviation between the two adjacent ball channel grooves and the maximum height value at the center of the spherical surface in each ball channel groove.

[0003] At present, the detection of the above two spatial geometric dimensions of the inner star wheel is carried out manually, and must be carried out in sequence, that is, the operator first uses one hand to support the inner star wheel against the reference abutment on the matching detection tool, then uses the other hand to move the dial gauge installed on the detection tool, and finally reads the dial gauge reading. Since there are multiple ball channel grooves on the inner star wheel, the above operation needs to be repeated multiple times after changing the angle of the inner star wheel, so the operation steps are relatively cumbersome, time-consuming and labor-intensive. At the same time, since the above two detection items need to detect each ball channel groove on the inner star wheel, two cycles of operation need to be carried out in sequence, which results in low work efficiency. In addition, since both hands of the operator are occupied during detection, the detected values need to be recorded by another person, which cannot be completed by a single person, so it is not convenient to use. Therefore, it is urgent to solve the problem. SUMMARY

[0004] In view of the above status of the prior art, the technical problem to be solved by the present application is to provide a detection device for inner star wheel which simplifies the operation steps to save time and effort, improves work efficiency and facilitates use, and also expands the application range to have good versatility.

[0005] The technical scheme adopted by the present application to solve the above technical problem is: a detection device for inner star wheel, characterized in that it comprises a support table and a positioning module arranged on the top of the support table, wherein the support table comprises a table plate and a supporting plate arranged transversely and distributed above and below respectively, and a plurality of vertical columns fixed between the supporting plate and the table plate; The positioning module comprises a seat block and a pad block arranged front and back respectively and fixed on the top of the table plate, a lining block fixed on the top of the pad block, a pressing block fixed on the top of the lining block, and a reference abutment ball fixed on the front side of the lining block and located between the pressing block and the pad block; It further comprises a first detection module and a second detection module which cooperate with each other. The first detection module comprises a first dial gauge fixed on the top of the table plate and located to the right of the cushion block, and a positioning detection ball fixed on the telescopic detection end of the first dial gauge and located between the pressing block and the cushion block and to the right of the reference abutment ball, and the telescopic detection end of the first dial gauge is arranged transversely to the left; The second detection module comprises a support rod vertically fixed between the supporting plate and the table plate and located below the cushion block, a pressing rod rotatably and elastically connected to the bottom of the table plate and located in front of the support rod, a second dial gauge fixed on the support rod and capable of being adjusted in height, and a detection pin fixed transversely on the front side of the upper end of the pressing rod, the lower end of the pressing rod always has a tendency to swing backward, and the telescopic detection end of the second dial gauge is arranged transversely forward and below the rotation axis of the pressing rod and always elastically presses against the rear side outer wall of the pressing rod; The upper end of the pressing rod passes through the table plate and extends between the cushion block and the positioning detection ball, the cavity hole is formed between the front and rear side outer walls of the positioning detection ball, the second detection module further comprises a limiting screw rod transversely inserted and screwed in the cushion block and located above the pressing rod, and the end of the limiting screw rod and the end of the detection pin both pass through the cavity hole and extend forward of the positioning detection ball.

[0006] Preferably, the steering module further comprises a slider movably connected to the seat block to have a front and rear arc line translation function, a servo motor fixed on the slider, a square shaft vertically and concentrically fixed on the rotation shaft of the servo motor, and an electric cylinder arranged in front of the seat block and close to the reference abutment ball, the fixed end of the electric cylinder is rotatably connected to the top of the seat block, the telescopic end of the electric cylinder is arranged transversely backward and towards the direction of the positioning detection ball and is rotatably connected to the slider, and the rotation shaft of the servo motor is vertically upward.

[0007] Preferably, the steering module further comprises a rotation stopping unit, the rotation stopping unit comprises a conical pressure head detachably invertedly sleeved on the outside of the square shaft and concentrically distributed with the square shaft and movable up and down along the axial direction of the square shaft, and a plurality of sawtooth grooves are formed on the outer wall of the conical pressure head and uniformly distributed at equal angles in the circumferential direction.

[0008] Preferably, the second detection module further comprises a limiting bolt transversely inserted and screwed in the support rod and located below the rotation axis of the pressing rod and higher than the telescopic detection end of the second dial gauge, the threaded end of the limiting bolt extends forward to the rear of the pressing rod, and a first lock nut is sleeved and screwed on the limiting bolt and located behind the support rod.

[0009] Preferably, the second detection module further comprises a tension spring fixed between the lower end of the pressing rod and the support rod to make the lower end of the pressing rod always have a tendency to swing backward, and the second detection module further comprises a second lock nut sleeved and screwed on the limiting screw rod and located behind the cushion block.

[0010] Preferably, the upper end of the square shaft is formed with a concentric outer threaded shaft upwardly, the steering module further comprises a knob nut sleeved and screwed on the outer threaded shaft and located above the conical pressure head, the height of the conical pressure head is greater than the length of the square shaft so that the upper end of the conical pressure head is higher than the root of the outer threaded shaft.

[0011] Preferably, the front side of the seat block is provided with an arc-shaped guide groove, the slider is movably embedded in the arc-shaped guide groove and can translate along the front and rear arc lines of the arc-shaped guide groove, the top of the slider is not lower than the top of the seat block, and the electric cylinder is arranged in front of the opening of the arc-shaped guide groove.

[0012] Preferably, the swing hole for the upper end of the pressing rod is provided in the table plate, and the arc-shaped avoiding hole below the arc-shaped guide groove is also provided in the table plate.

[0013] Preferably, the servo motor is fixed to the bottom of the slider and movably arranged in the arc-shaped avoiding hole, the lower end of the square shaft is vertically and rotatably connected in the slider, and the rotating shaft of the servo motor is vertically upwardly arranged and concentrically fixed to the lower end of the square shaft.

[0014] Compared with the prior art, the present application has the following advantages: The present application can automatically detect two spatial geometric dimensions of the inner star wheel on the same tooling, without manual operation, and one round of repeated detection operation is saved, thereby simplifying the operation steps to save time and labor; moreover, automatic transposition can be realized by means of the steering module after each ball channel groove is detected, thereby improving the work efficiency; at the same time, the hands of the operator are freed, and only one operator can complete the detection and record the dial gauge value, thereby facilitating use; in addition, the steering module of the present application can be adapted to inner star wheels with different shaft hole inner diameter specifications, thereby expanding the application range to have good versatility. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a front side top view of the exploded structure of the present application; Fig. 2 is a right rear side top view of the exploded structure of the present application; Fig. 3 is a right rear side exploded structure view of the second detection module of the present application. DETAILED DESCRIPTION

[0016] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meanings as understood by one of ordinary skill in the art to which this application pertains. The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish one element from another, and the terms "comprises", "comprising", "includes", "including" and the like can mean comprising, consisting of or consisting primarily of the listed elements but not excluding additional elements. The terms "connected", "coupled", and the like, can not necessarily denote a direct connection or coupling, but can also include an indirect connection or coupling, such as through one or more intervening elements. The terms "upper", "lower", "left", "right" and the like can be used for ease of description to describe one element's relationship to another element as the absolute position of the elements changes. The term "and / or" is merely an associative relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there can be three cases: A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects.

[0017] In order to keep the following description of the embodiments of the present application clear and brief, the detailed description of known functions and known components is omitted.

[0018] As shown in Figs. 1-3 A detection device of an inner star wheel, comprising a support table and a positioning module arranged on the top of the support table, the support table comprising a horizontal plate 1 and a supporting plate 22 arranged horizontally and distributed vertically, and a plurality of vertical columns 23 fixed vertically between the supporting plate 22 and the horizontal plate 1; The positioning module comprises a seat block 17 and a pad block 2 arranged horizontally and fixed on the top of the horizontal plate 1, a lining block 4 fixed on the top of the pad block 2, a pressing block 3 fixed on the top of the lining block 4, and a reference abutment ball 5 fixed on the front side of the lining block 4 and located between the pressing block 3 and the pad block 2; Further comprising a first detection module and a second detection module cooperating with each other; The first detection module comprises a first dial gauge 8 fixed on the top of the horizontal plate 1 and located to the right of the lining block 4, and a positioning detection ball 6 fixed on the telescopic detection end of the first dial gauge 8 and located between the pressing block 3 and the pad block 2 and to the right of the reference abutment ball 5, the telescopic detection end of the first dial gauge 8 being arranged horizontally to the left; The second detection module includes a support bar 12 vertically fixed between the support plate 22 and the table 1 and located below the pad 2, a pressure rod 14 rotatably and elastically connected to the bottom of the table 1 and located in front of the support bar 12, a second dial indicator 15 fixed to the support bar 12 and adjustable up and down at a fixed height, and a detection pin 10 laterally fixed to the front side of the upper end of the pressure rod 14, the lower end of the pressure rod 14 always has a tendency to swing backward, the telescopic detection end of the second dial indicator 15 is laterally set forward and located below the rotation axis of the pressure rod 14 and is always elastically pressed against the rear outer wall of the pressure rod 14; The upper end of the pressure rod 14 moves upward through the table plate 1 and extends between the lining block 4 and the positioning detection ball 6. A cavity 61 is provided between the front and rear outer walls of the positioning detection ball 6. The second detection module also includes a limit screw 9 that is laterally inserted and threaded in the lining block 4 and is located above the pressure rod 14. The end of the limit screw 9 and the end of the detection pin 10 both move through the cavity 61 and extend in front of the positioning detection ball 6.

[0019] A detection device for an inner star wheel also includes a steering module, which includes a slider 18 movably connected to a seat block 17 to have a forward and backward arc translation function, a servo motor 19 fixed on the slider 18, a square shaft 24 vertically and concentrically fixed on the rotating shaft of the servo motor 19, and an electric cylinder 21 arranged in front of the seat block 17 and close to the reference backing ball 5, the fixed end of the electric cylinder 21 is rotatably connected to the top of the seat block 17, the telescopic end of the electric cylinder 21 is arranged horizontally backward and in the direction of the positioning detection ball 6 and is rotatably connected to the slider 18, and the rotating shaft of the servo motor 19 is arranged vertically upward.

[0020] The steering module also includes a stop unit, which includes a conical pressure head 20 that is detachably inverted and sleeved on the outside of the square shaft 24, concentrically distributed with the square shaft 24, and movable up and down along the axis of the square shaft 24. The outer wall of the conical pressure head 20 is provided with a plurality of serrated grooves 201 uniformly distributed at equal angles along the circumferential direction.

[0021] The first detection module also includes a guide seat 7 fixed on the top of the table 1 and located to the right of the pad 4, and an extension rod 11 laterally inserted and connected to the guide seat 7. The first dial indicator 8 is fixed on the right outer wall of the guide seat 7. The telescopic detection end of the first dial indicator 8 is laterally inserted into the guide seat 7 and fixed to the right end of the extension rod 11. The left end of the extension rod 11 is fixed on the positioning detection ball 6.

[0022] Vertically distributed slots 121 are provided in the support bar 12. The second detection module also includes a lifting block 26 fixed on the support bar 12 and adjustable up and down to a fixed height. The second dial indicator 15 is fixed on the lifting block 26. The telescopic detection end of the second dial indicator 15 passes forward through the slot 121 and extends to the front of the support bar 12.

[0023] The second detection module further comprises a limiting bolt 13 transversely screwed in the support bar 12 and located below the rotation axis of the pressing rod 14 and higher than the telescopic detection end of the second dial gauge 15, the threaded end of the limiting bolt 13 extends forward to the rear of the pressing rod 14, and a first check nut 27 located at the rear of the support bar 12 is further screwed on the limiting bolt 13.

[0024] The second detection module further comprises a tension spring 16 fixed between the lower end of the pressing rod 14 and the support bar 12, so that the lower end of the pressing rod 14 always has a tendency to swing backward.

[0025] The second detection module further comprises a second check nut 28 screwed on the limiting bolt 9 and located at the rear of the lining block 4.

[0026] The upper end of the square shaft 24 is formed with an outer threaded shaft 241 arranged concentrically upward, and the turning module further comprises a knob nut 25 screwed on the outer threaded shaft 241 and located above the conical pressure head 20, the height of the conical pressure head 20 is greater than the length of the square shaft 24, so that the upper end of the conical pressure head 20 is higher than the root of the outer threaded shaft 241.

[0027] The front side of the seat block 17 is provided with an arc-shaped guide groove 171, the sliding block 18 is movably embedded in the arc-shaped guide groove 171 and can translate along the front and rear arc lines of the arc-shaped guide groove 171, the top of the sliding block 18 is not lower than the top of the seat block 17, and the electric cylinder 21 is arranged in front of the opening of the arc-shaped guide groove 171.

[0028] Two outer walls of the sliding block 18 towards the inner walls of the arc-shaped guide groove 171 are each formed with an arc surface 181, and the two arc surfaces 181 are respectively slidably attached to the inner walls of the arc-shaped guide groove 171.

[0029] The swing hole 101 for the upper end of the pressing rod 14 is formed in the table plate 1, and the arc-shaped avoiding hole 102 located below the arc-shaped guide groove 171 is also formed in the table plate 1.

[0030] The servo motor 19 is fixed to the bottom of the sliding block 18 and movably arranged in the arc-shaped avoiding hole 102, the lower end of the square shaft 24 is vertically and rotatably connected in the sliding block 18, and the rotating shaft of the servo motor 19 is vertically upward arranged and concentrically fixed to the lower end of the square shaft 24.

[0031] Working principle: The outer part of the inner star wheel 29 has a plurality of ball channel grooves 291 arranged at equal angles in the circumferential direction, and the bottom of each ball channel groove 291 is provided with an outwardly convex spherical surface 292. The top and bottom centers of the inner star wheel 29 have an axle hole 293, and the inner periphery of the axle hole 293 is formed with a plurality of sawtooth grooves 294 arranged at equal angles in the circumferential direction.

[0032] First, the knob nut 25 is unscrewed from the outer threaded shaft 241, and the conical pressure head 20 is taken out upwards, then the inner star wheel 29 is placed on the top of the slider 18 and is sleeved on the outer side of the square shaft 24, and then the conical pressure head 20 is assembled on the square shaft 24 in the same direction. Since the outer diameter of the lower end of the conical pressure head 20 is smaller than the inner diameter of the shaft hole 293 of the inner star wheel 29, the lower end of the conical pressure head 20 will extend into the shaft hole 293. The number of the sawtooth grooves 201 is set to match the number of the sawteeth 294 in the shaft hole 293. During the lowering of the conical pressure head 20, at least two mutually diagonal sawteeth 294 will be inserted into the corresponding two sawtooth grooves 201, thereby realizing automatic centering to ensure that the inner star wheel 29 is coaxially arranged with the rotating shaft of the servo motor 19 in the steering module through the square shaft 24. Finally, the knob nut 25 is assembled on the outer threaded shaft 241 and tightened to press the conical pressure head 20 downwards, thus completing the fixation of the inner star wheel 29.

[0033] Then, the servo motor 19 is started to rotate its rotating shaft to the initial position, and then the inner star wheel 29 is rotated to the specified position by means of the square shaft 24 and the conical pressure head 20. Then the extension end of the electric cylinder 21 is driven to extend outward to push the slider 18 to move backward along the arc line of the arc-shaped guide groove 171, and then the inner star wheel 29 is synchronously moved and gradually approaches the positioning module by means of the square shaft 24 and the conical pressure head 20.

[0034] Then, one of the ball channel grooves 291 on the inner star wheel 29 will first reach the reference abutment ball 5 and make the reference abutment ball 5 fit into the above-mentioned ball channel groove 291 and match each other. Then, the adjacent ball channel groove 291 located on the right side of the reference abutment ball 5 will gradually approach the positioning detection ball 6 in the first detection module as the inner star wheel 29 continues to move, thereby forcing the positioning detection ball 6 to be clamped into it until they match each other, so as to compress the extension detection end of the first dial gauge 8 by means of the extension rod 11. After reading the dial value of the first dial gauge 8, the center distance deviation between the above-mentioned two adjacent ball channel grooves 291 can be calculated (prior art).

[0035] During the clamping process of the positioning detection ball 6, the detection pin 10 in the second detection module will also be contacted and pushed backward, thereby driving the lower end of the pressure rod 14 to swing forward to leave the extension detection end of the second dial gauge 15 by means of the rotatable connection relationship between the pressure rod 14 and the table plate 1. Since the extension detection end of the second dial gauge 15 is always elastically pressed on the rear side outer wall of the pressure rod 14, when the pressure rod 14 leaves the extension detection end of the second dial gauge 15, the extension detection end of the second dial gauge 15 will automatically extend outward to maintain its state of being pressed on the rear side outer wall of the pressure rod 14. By reading the dial value of the second dial gauge 15, the maximum height value of the ball surface 292 center in the ball channel groove 291 where the positioning detection ball 6 is located can be calculated (prior art).

[0036] After this round of detection is completed, the telescopic end of the electric cylinder 21 is first driven to retract inward, and then the inner star wheel 29 is driven to move forward in an arc according to the same principle, so that the reference abutment ball 5 and the positioning detection ball 6 are both away from a ball channel groove 291 in which they are matched with each other, and then the servo motor 19 is started to rotate the shaft counterclockwise by a certain angle, so that the ball channel groove 291 originally matched with the positioning detection ball 6 is rotated by the same angle; then the telescopic end of the electric cylinder 21 is driven to extend outward again to drive the inner star wheel 29 to move backward in an arc again according to the same principle, so that the reference abutment ball 5 is embedded in the ball channel groove 291 originally matched with the positioning detection ball 6, and the positioning detection ball 6 is clamped into a ball channel groove 291 located on the downstream side of the ball channel groove 291 originally matched with the positioning detection ball 6, so that the center distance deviation of the two adjacent ball channel grooves 291 and the maximum height value of the ball surface 292 at the center of the next ball channel groove 291 are detected again, and then the above operation is repeated in this way until each ball channel groove 291 on the inner star wheel 29 is detected.

[0037] After all the detection is completed, the knob nut 25 is unscrewed to be separated from the outer threaded shaft 241, the conical pressure head 20 is taken out upward, and then the inner star wheel 29 is taken out.

[0038] The present application can simultaneously detect two spatial geometric dimensions of the inner star wheel on the same tooling, without manual operation, and one round of repeated detection operation is saved, so as to simplify the operation steps and save time and effort; moreover, automatic transposition can be realized by means of the steering module after each ball channel groove 291 is detected, so as to improve the work efficiency; at the same time, the hands of the operator are freed, and only one operator can complete the detection and record the dial gauge value, so as to facilitate the use; in addition, the steering module of the present application can be adapted to the inner star wheels with different shaft hole diameter specifications, so as to expand the application range and have good universality.

[0039] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced with equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A detection device for an inner star wheel, characterized in that: The invention comprises a support platform and a positioning module arranged on the top of the support platform, wherein the support platform comprises a table plate and a supporting plate arranged horizontally and distributed up and down respectively, and a plurality of columns vertically fixed between the supporting plate and the table plate; The positioning module includes a seat block and a cushion block fixed on the top of the table and arranged front and back respectively, a cushion block fixed on the top of the cushion block, a pressure block fixed on the top of the cushion block, and a reference backing ball fixed on the front side of the cushion block and located between the pressure block and the cushion block; Also includes a first detection module and a second detection module that cooperate with each other; The first detection module includes a first dial indicator fixed on the top of the table and located to the right of the pad, and a positioning detection ball fixed on the telescopic detection end of the first dial indicator and located between the pressure block and the pad and to the right of the reference backing ball, wherein the telescopic detection end of the first dial indicator is arranged horizontally to the left; The second detection module includes a support bar vertically fixed between the support plate and the table and located below the pad, a pressure rod rotatably elastically connected to the bottom of the table and located in front of the support bar, a second dial indicator fixed on the support bar and adjustable up and down at a fixed height, and a detection pin laterally fixed to the front side of the upper end of the pressure rod, the lower end of the pressure rod always has a tendency to swing backward, the telescopic detection end of the second dial indicator is laterally arranged forward and located below the rotation axis of the pressure rod and is always elastically pressed against the rear outer wall of the pressure rod; The upper end of the pressure rod moves upward through the table and extends between the pad and the positioning detection ball. A cavity is provided between the front and rear outer walls of the positioning detection ball. The second detection module also includes a limit screw that is laterally inserted and threaded in the pad and located above the pressure rod. The end of the limit screw and the end of the detection pin both move through the cavity and extend in front of the positioning detection ball.

2. The detection device for an inner star wheel according to claim 1, characterized in that: It also includes a steering module, which includes a slider movably connected to the seat block to have a forward and backward arc translation function, a servo motor fixed on the slider, a square shaft vertically and concentrically fixed on the servo motor's rotating shaft, and an electric cylinder arranged in front of the seat block and close to the reference backrest ball. The fixed end of the electric cylinder is rotatably connected to the top of the seat block, the telescopic end of the electric cylinder is arranged horizontally backward and in the direction of the positioning detection ball and is rotatably connected to the slider, and the rotating shaft of the servo motor is arranged vertically upward.

3. The detection device for an inner star wheel according to claim 2, characterized in that: The steering module also includes a stop unit, which includes a conical pressure head that is detachably inverted and sleeved outside the square shaft, concentrically distributed with the square shaft, and movable up and down along the axis of the square shaft. The outer wall of the conical pressure head is provided with a plurality of serrated grooves uniformly distributed at equal angles along the circumferential direction.

4. The detection device for an inner star wheel according to claim 1, characterized in that: The second detection module also includes a limit bolt that is transversely inserted and threaded in the support and is located below the rotation axis of the pressure rod and higher than the telescopic detection end of the second dial indicator. The threaded end of the limit bolt extends forward to the rear of the pressure rod, and the limit bolt is also provided with a first anti-loosening nut threaded on the rear of the support.

5. The inner star wheel detection device according to claim 1, characterized in that: The second detection module also includes a tension spring fixed between the lower end of the pressure rod and the support bar so that the lower end of the pressure rod always has a tendency to swing backward; the second detection module also includes a second anti-loosening nut that is threaded on the limiting screw and located behind the pad.

6. The inner star wheel detection device according to claim 2, characterized in that: The upper end of the square shaft is formed with a concentrically arranged external threaded shaft, and the steering module also includes a knob nut that is threaded on the external threaded shaft and located above the conical pressure head. The height of the conical pressure head is greater than the length of the square shaft so that the upper end of the conical pressure head is higher than the root of the external threaded shaft.

7. The inner star wheel detection device according to claim 2, characterized in that: An arc-shaped guide groove is provided on the front side of the seat block, and the slider is movably embedded in the arc-shaped guide groove and can translate along the arc line of the arc-shaped guide groove. The top of the slider is not lower than the top of the seat block, and the electric cylinder is arranged in front of the opening of the arc-shaped guide groove.

8. The inner star wheel detection device according to claim 7, characterized in that: The platform is provided with a swing hole for the upper end of the pressure rod to pass through, and the platform is also provided with an arc-shaped avoidance hole located below the arc-shaped guide groove.

9. The inner star wheel detection device according to claim 8, characterized in that: The servo motor is fixed to the bottom of the slider and movably arranged in the arc-shaped avoidance hole. The lower end of the square shaft is vertically and rotatably inserted into the slider. The rotating shaft of the servo motor is vertically arranged upward and concentrically fixed to the lower end of the square shaft.

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