Outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipeline

Abstract

The invention relates to the technical field of centerless grinding, and discloses outer surface grinding equipment for stainless steel pipeline electrolytic polishing pretreatment, which comprises a base, a supporting table is fixedly arranged in the middle of the upper end surface of the base, and a pipeline slide way is formed in the middle of the upper end surface of the supporting table; a continuous discharging box is vertically riveted to the upper end of the supporting table and comprises a box body, and an arranging chamber for storing pipe fittings is formed in the box body. According to the outer surface grinding equipment for electrolytic polishing pretreatment of the stainless steel pipeline, when a compression-resistant lining continues to move leftwards to extend out of a pipe fitting, the compression-resistant lining can make contact with small arc contact faces of two sets of automatic limiters, so that two sets of displacement blocks are stripped by a certain distance, the end face of the pipe fitting leaves a pressure-bearing face, and the pipe fitting loses constraint; at the moment, the pipe fitting can move leftwards along with the compression-resistant lining, the outer pipe face of the pipe fitting makes contact with the large arc contact face and the small arc contact face in sequence, and the two sets of displacement blocks are completely expanded.

Description

Technical Field

[0001] The invention relates to the technical field of centerless grinding, in particular to an outer surface grinding device used for electrolytic polishing pretreatment of stainless steel pipelines. Background Art

[0002] Stainless steel pipes are made of steel ingots or solid round steel through perforation into rough tubes, and then made by cold rolling, cold drawing, annealing, grinding and electrolytic polishing. They are widely used in industrial pipelines such as petroleum, chemical, medical, food, light industry, mechanical instruments, and mechanical structural components. Before electrolytic polishing, the stainless steel pipes with rough outer surfaces need to be ground first, so centerless grinders are used. They are also called centerless cylindrical grinders. They are a type of grinder that does not require the axis positioning of the workpiece for grinding. They are mainly composed of three mechanisms: grinding wheel, adjusting wheel and workpiece holder. The grinding wheel is actually responsible for grinding, and the adjusting wheel controls the rotation of the workpiece and the feed speed of the workpiece.

[0003] There are many technical defects in the use of existing centerless grinding machine equipment. First, the pipes on the grinding machine are all manually fed, resulting in poor processing continuity, low work efficiency, and large visual errors in manual feeding; second, the current stainless steel pipes are hollow and lack protection during grinding, which easily causes the stainless steel pipes to sink inward when the grinding force increases or after a collision, causing damage to the workpiece; third, due to the irregular protrusions on the surface of the pipe, the pipe will jump and deviate during rotational grinding, and the existing centerless support table cannot be adjusted according to the actual situation to obtain more effective support and limiting, so that the local grinding is not sufficient, thereby reducing the grinding effect.

[0004] In summary, considering that the existing facilities cannot meet the work requirements, we propose an external surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes. Summary of the invention

[0005] The main purpose of the present invention is to provide an outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: An outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines includes a base, a support platform is fixedly arranged in the middle of the upper end surface of the base, a pipeline slide is provided in the middle position of the upper end surface of the support platform, a continuous discharge box is vertically riveted to the upper end of the support platform, and the continuous discharge box includes a box body, and an arrangement chamber for storing pipe fittings is provided inside the box body.

[0007] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, wherein: the upper end surface of the discharge box is symmetrically provided with two groups of limit rod holes connected to the arrangement chamber, each group of the limit rod holes is for pressure rods to pass through, the lower ends of the two groups of pressure rods are connected with curved pressure plates acting on the pipe fittings, the upper ends of the two groups of pressure rods are commonly connected with a top plate, four groups of No. 1 spring seats are symmetrically welded on both sides of the top plate, and four groups of No. 2 spring seats are symmetrically welded on both sides of the box body, the No. 1 spring seats and No. 2 spring seats corresponding to the upper and lower ones are connected by tension springs, and the bottom of the discharge box is provided with a discharge port connected to the pipeline slide, and the number of the tension springs is 4 groups.

[0008] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, wherein: storage grooves are symmetrically opened on the left end of the pipe slide and close to the discharge port, and automatic limiters are installed in each group of the storage grooves, and the number of the automatic limiters is 2 groups.

[0009] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, two groups of limiting rails are symmetrically arranged on the left side of the support platform, and a grinding wheel seat and a guide wheel seat are respectively installed in the two groups of limiting rails, a first wheel shell is installed on the grinding wheel seat, a grinding wheel is installed in the first wheel shell, a second wheel shell is installed on the guide wheel seat, and a guide wheel is installed in the second wheel shell, the grinding wheel and the guide wheel rotate in the same direction and act on the outer surface of the pipe fitting together.

[0010] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, a positioning seat is horizontally installed in the left area between the grinding wheel and the guide wheel, a centerless support platform is arranged on the upper end of the positioning seat, and an arc-shaped material guide groove acting on the pipe fitting is opened upward inside the centerless support platform.

[0011] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, wherein: a guide seat is fixed on the horizontal right side of the discharge box, the upper end of the guide seat is connected to a cylindrical shell seat, a cylindrical rotating seat is rotatably arranged inside the cylindrical shell seat, short shafts are symmetrically welded at both ends of the cylindrical rotating seat, each group of the short shafts is fixed by the first bearing seat and the inner wall of the cylindrical shell seat, one group of the short shafts extends outwardly and is sleeved with a large gear, the lower end of the large gear is meshed with a small gear, the small gear is sleeved on the output shaft of the uniform speed motor, the uniform speed motor is arranged through the outer surface of the guide seat, and a rotary slide groove is provided on the cylindrical rotating seat.

[0012] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, wherein: a limiting guide sleeve is horizontally installed inside the guide seat, a push rod is movably arranged inside the limiting guide sleeve, a driving slider extending into the rotary slide groove is welded to the right end portion of the push rod, a connecting groove is provided on the left end face of the push rod, a connecting bearing is installed in the connecting groove, a pressure-resistant bushing is connected to the end of the connecting bearing away from the connecting groove, the pressure-resistant bushing is inserted into the interior of the pipe fitting through horizontal movement, and a circular opening for movement of the push rod and the pressure-resistant bushing is provided on the left end face of the guide seat, and the circular opening is docked with the pipeline slide.

[0013] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the automatic limiter includes a displacement block, a reset spring, a pressure-bearing surface, a large arc contact surface and a small arc contact surface. The displacement block is located in the receiving groove and partially extends out of the receiving groove. The side of the displacement block is connected to the inner groove wall of the receiving groove through several groups of reset springs. The number of the reset springs is preferably 2-4 groups. The right end of the displacement block is provided with a pressure-bearing surface acting on the end of the pipe fitting. The inner side of the displacement block is sequentially provided with a large arc contact surface and a small arc contact surface. The large arc contact surface and the small arc contact surface have a smooth transition. The large arc contact surface acts on the end of the pipe fitting, and the small arc contact surface acts on the end of the pressure-resistant bushing.

[0014] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, wherein: the bottom of the grinding wheel seat and the guide wheel seat are riveted with a movable platform, the upper end surface of the base is provided with a strip adjustment groove for linear movement of two groups of movable platforms respectively, the two groups of movable platforms are installed with a screw nut sleeve, the two groups of screw nut sleeves are for the same group of bidirectional screws to pass through, the bidirectional screw is located inside the base, and several groups of forward spiral patterns and reverse spiral patterns are symmetrically distributed on the bidirectional screw, the forward spiral patterns and reverse spiral patterns respectively act on the two groups of screw nut sleeves, both ends of the bidirectional screw are fixed by the second bearing seat and the inner wall of the base, one end of the bidirectional screw extends outward and is connected to a screw adjustment motor through a coupling, and the screw adjustment motor is located inside the base.

[0015] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, wherein: a plurality of groups of connecting plugs are welded to the end of the connecting bearing away from the connecting groove, and a positioning hole is provided on each group of the connecting plugs, and a rectangular slot corresponding to the connecting plug is provided on the end surface of the pressure-resistant bushing close to the connecting bearing, and the number of the rectangular slots and connecting plugs is consistent, preferably 3-4 groups, and a linkage self-locking device is horizontally arranged at the center position of the plurality of groups of the rectangular slots.

[0016] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, the linked self-locking device includes a servo motor, a rotating shaft, a third bearing seat, a crank cone, a cam surface and a step. The servo motor is horizontally installed at the inner center position of the pressure-resistant bushing. The rotating shaft on the servo motor extends horizontally outward. The end of the rotating shaft is fixed by the third bearing seat and the inner wall of the pressure-resistant bushing. A crank cone is sleeved on the rotating shaft. Several groups of cam surfaces are evenly distributed on the circumferential surface of the crank cone. The number of the cam surfaces is consistent with the number of rectangular slots, preferably 3-4 groups, and a step is provided at one end of each group of cam surfaces.

[0017] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the linked self-locking device also includes a lock column, a lock head, a spring sleeve and a spring, a column hole for the movement of the lock column is opened on the inner groove surface of the rectangular slot, one end of the lock column is in contact with the cam surface, and a lock head is provided at the end of the lock column extending out of the column hole, and the lock head is inserted into the corresponding positioning hole, a spring sleeve is fixedly provided in the middle of the lock column, and a spring sleeved on the outside of the lock column is fixed between the spring sleeve and the bottom of the column hole.

[0018] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, the upper end surface of the positioning seat is provided with a rotating groove for the movement of the centerless support platform, and an adjusting shaft is installed through the lower position of the centerless support platform. The two ends of the adjusting shaft passing through the centerless support platform are fixed by damping bearings and the inner wall of the positioning seat, and an inner recess is provided at the bottom of the centerless support platform, and a precision gear is sleeved on the adjusting shaft at the position of the inner recess.

[0019] As a preferred solution of the external surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, the lower end of the precision gear is meshed with a long tooth rod, and the upper end face of the long tooth rod is equidistantly provided with a plurality of groups of fine teeth, a connecting rod is horizontally welded to one end of the long tooth rod, a guide rod groove acting on the connecting rod is provided on the side of the positioning seat, an adjustment handle is installed on the end of the connecting rod away from the long tooth rod, a clip is riveted inside the positioning seat, a tactile steel sheet is clamped on the clip, the lower end of the tactile steel sheet acts on the gap between adjacent fine teeth, and the tactile steel sheet has deformation restoring properties.

[0020] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the grinding wheel seat and the guide wheel seat move linearly between two sets of limiting rails.

[0021] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, a driving structure acting on the grinding wheel is installed on the outer side of the guide wheel seat.

[0022] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, several groups of side straightening wheels acting on the pipe fittings are symmetrically installed on the groove wall of the arc-shaped material guide groove, and the number of the side straightening wheels is preferably 10-20 groups.

[0023] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, a feeding port communicating with the arrangement chamber is provided at the upper position of the outer side surface of the box body.

[0024] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, a bracket is arranged between the guide seat and the base.

[0025] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the cross-sectional sizes of the push rod and the pipe fitting are the same.

[0026] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipes described in the present invention, the rotary slide is a rotary structure, and the cylindrical rotating seat rotates one circle to drive the push rod to reciprocate once.

[0027] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the lower end of the curved pressing plate is a curved surface adapted to the pipe fitting.

[0028] As a preferred solution of the outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines described in the present invention, the inner diameters of the pressure-resistant bushing and the pipe fitting are adapted to each other, and no relative movement occurs between the two after they are assembled.

[0029] The present invention provides an outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines through improvement, which has the following significant improvements and advantages compared with the prior art: The pipe fittings are placed in the arrangement chamber in sequence and arranged up and down. Under the action of the curved pressure plate, the group of pipe fittings at the bottom position enters the pipeline slide from the discharge port. The push rod supports the multiple groups of pipe fittings in the upper arrangement chamber during movement. When the push rod returns to its position and evacuates the pipeline slide, the tension spring generates a reset action on the curved pressure plate. Under the pressure of the curved pressure plate, the group of pipe fittings at the bottom are replaced in the pipeline slide, forming a continuous feeding process with a high degree of automation.

[0030] Start the uniform speed motor, and after a series of transmissions, the cylindrical rotating seat makes circular motion. The rotary slide and the driving slider interact with each other, causing the push rod to move leftward in the limit guide sleeve first, driving the pressure-resistant bushing to extend out of the round mouth and enter the inside of the pipe slideway. After pushing the pipe to the grinding position, the push rod drives the pressure-resistant bushing back to its position. This cycle of pushing materials saves time and effort.

[0031] Let one end of the pipe fit against the pressure-bearing surfaces of the two sets of automatic limiters to play a blocking role. The pressure-resistant bushing enters the pipe while continuing to move to the left, overcoming the friction resistance between the two and moving inside the pipe until the pressure-resistant bushing just passes through the pipe to form an inner lining for the pipe. This can protect the pipe during transportation and grinding to prevent the pipe from being concave.

[0032] One end of the pipe fitting contacts the pressure-bearing surface of the two sets of automatic limiters, so that the automatic limiter plays a blocking role. When the pressure-resistant bushing continues to move to the left and extends out of the pipe fitting, it will contact the small arc contact surface of the two sets of automatic limiters, so that the two sets of displacement blocks are peeled off a certain distance respectively, so that the end face of the pipe fitting leaves the pressure-bearing surface, and the pipe fitting loses its restraint. At this time, the pipe fitting will move to the left with the pressure-resistant bushing, and use the outer tube surface of the pipe fitting to contact the large arc contact surface and the small arc contact surface in sequence, completely expanding the two sets of displacement blocks, so that the automatic limiter has the function of automatic pop-up and reset.

[0033] Start the servo motor, and the shaft drives the crank table to rotate a certain angle. Several groups of lock cylinders will slide relative to each other on their respective cam surfaces, causing each group of lock cylinders to extend out of the column holes at the same time, and the lock heads are inserted into the corresponding positioning holes to automatically complete the connection between the pressure-resistant bushing and the connecting bearing. By letting the servo motor rotate in the opposite direction, after a series of transmissions, each group of lock cylinders will be retracted into the column holes, and the lock heads will exit the positioning holes. At this time, the push rod will separate from the pressure-resistant bushing during the process of returning to the right in a straight line, completing automatic disassembly. Installation and disassembly save time and effort, and the pressure-resistant bushing has two working modes, which is more flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of one direction of an outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines according to the present invention; Figure 2 This is a schematic diagram of the overall structure of another direction of an outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines according to the present invention; Figure 3 It is a schematic diagram of the external structure of the continuous discharge box of the present invention; Figure 4 This is a schematic diagram of the continuous discharge box of the present invention from a bottom-up perspective; Figure 5 It is a schematic diagram of the internal structure of the cylindrical shell seat of the present invention; Figure 6 It is a schematic diagram of the internal structure of the guide seat of the present invention; Figure 7 This is a structural diagram of the connection between the push rod and the compression sleeve in the first embodiment of the present invention; Figure 8 It is a schematic diagram of the relative positions of the automatic limiter and the compression bushing of the present invention; Fig. 9 It is a schematic diagram of the specific structure of the automatic limiter of the present invention; Fig.10 It is a schematic diagram of the driving structure of the grinding wheel seat and the guide wheel seat of the present invention; Fig.11 This is a diagram of the connection structure between the push rod and the compression sleeve in the second embodiment of the present invention; Fig.12 It is a schematic diagram of the specific structure of the linkage self-locking device of the present invention; Fig.13 This is a schematic diagram of the external structure of the positioning seat in the third embodiment of the present invention; Fig.14 It is a schematic diagram of the driving structure of the centerless support platform of the present invention; Fig.15 This is a schematic diagram of the installation position of the tactile steel sheet of the present invention.

[0035] In the figure: 1. base; 2. support platform; 3. pipeline slide; 4. continuous discharge box; 5. guide seat; 6. cylindrical shell seat; 7. pipe fittings; 9. automatic limiter; 91. displacement block; 92. reset spring; 93. pressure surface; 94. large arc contact surface; 95. small arc contact surface; 10. discharge port; 11. box; 12. arrangement chamber; 13. limit rod hole; 14. pressure rod; 15. top plate; 16. No. 1 spring seat; 17. No. 2 spring seat; 18. stretch Spring; 19, curved pressure plate; 20, cylindrical rotating seat; 21, short shaft; 22, first bearing seat; 23, large gear; 24, small gear; 25, uniform speed motor; 26, rotary slide; 30, limit guide sleeve; 31, push rod; 32, driving slide block; 33, connecting groove; 34, connecting bearing; 35, pressure-resistant bushing; 40, grinding wheel seat; 41, guide wheel seat; 42, first wheel shell; 43, grinding wheel; 44, guide wheel; 46, positioning seat; 47, centerless support Support platform; 48, arc-shaped guide groove; 50, moving platform; 51, screw nut sleeve; 52, bidirectional screw; 53, positive spiral pattern; 54, reverse spiral pattern; 55, second bearing seat; 56, screw adjustment motor; 60, connecting plug; 61, positioning hole; 62, rectangular slot; 63, column hole; 64, linkage self-locking device; 640, servo motor; 641, rotating shaft; 642, third bearing seat; 643, crank cone; 644, cam surface; 645, step ; 646, locking column; 647, locking head; 648, spring sleeve; 649, spring; 70, adjusting shaft; 71, damping bearing; 72, precision gear; 73, long tooth rod; 74, fine teeth; 75, connecting rod; 76, adjusting handle; 77, clip; 78, tactile steel sheet; 79, guide rod groove; 80, limiting track; 81, storage groove; 82, round mouth; 83, feeding port; 84, side straightening wheel; 85, driving structure; 86, rotating groove; 87, inner concave mouth. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0037] like Figure 1-10 As shown, this embodiment provides an outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipes, including a base 1, a support platform 2 is fixedly arranged in the middle of the upper end surface of the base 1, a pipe slide 3 is opened in the middle position of the upper end surface of the support platform 2, the size of the pipe slide 3 is adapted to the pipe fitting 7, and a continuous discharge box 4 is vertically riveted to the upper end of the support platform 2.

[0038] Specifically, the continuous discharge box 4 includes a box body 11, and an arrangement chamber 12 for storing the pipe fittings 7 is opened inside the box body 11 (the width of the arrangement chamber 12 is only for a single group of pipe fittings 7 to pass through), and two groups of limit rod holes 13 connected to the arrangement chamber 12 are symmetrically opened on the upper end surface of the discharge box 4. The limit rod holes 13 play a role of limiting guides, and each group of limit rod holes 13 is for a pressure rod 14 to pass through. The lower ends of the two groups of pressure rods 14 are connected to a curved pressure plate 19 acting on the pipe fittings 7, and the lower end of the curved pressure plate 19 is a curved surface adapted to the pipe fittings 7, such as Figure 3 and 4 shown.

[0039] The upper ends of the two groups of compression rods 14 are commonly connected to a top plate 15, and four groups of No. 1 spring seats 16 are symmetrically welded on both sides of the top plate 15. Four groups of No. 2 spring seats 17 are symmetrically welded on both sides of the box body 11. The corresponding No. 1 spring seats 16 and No. 2 spring seats 17 are connected by tension springs 18. The tension springs 18 have a restoring elastic force when they are stretched. Figure 3 and 4 shown.

[0040] The bottom of the continuous discharge box 4 is provided with a discharge port 10 connected to the pipeline slide 3. Figure 4 shown.

[0041] Further, a guide seat 5 is fixed to the horizontal right side of the continuous discharge box 4, a bracket is arranged between the guide seat 5 and the base 1, the bracket plays a supporting role, the upper end of the guide seat 5 is connected to a cylindrical shell seat 6, and a cylindrical rotating seat 20 is rotatably arranged inside the cylindrical shell seat 6, such as Figure 1 , 2 and 5.

[0042] Specifically, short shafts 21 are symmetrically welded at both ends of the cylindrical rotating seat 20, and each group of short shafts 21 is fixed by the first bearing seat 22 and the inner wall of the cylindrical shell seat 6. One group of short shafts 21 extends outward and is sleeved with a large gear 23. The lower end of the large gear 23 is meshed with a small gear 24, and the small gear 24 is sleeved on the output shaft of the uniform speed motor 25. The uniform speed motor 25 is arranged through the outer surface of the guide seat 5. The cylindrical rotating seat 20 is provided with a rotary slide groove 26, such as Figure 5 and 6 shown.

[0043] The rotary slide 26 is a rotary structure. The cylindrical rotating seat 20 rotates one circle to drive the push rod 31 to reciprocate once.

[0044] Furthermore, a limited guide sleeve 30 is horizontally installed inside the guide seat 5, and a push rod 31 is movably arranged inside the limited guide sleeve 30. The cross-sectional size of the push rod 31 and the pipe fitting 7 are the same. Figure 5 and 6 shown.

[0045] The right end of the push rod 31 is welded with a driving slider 32 extending into the rotary slide groove 26, and the left end surface of the push rod 31 is provided with a connecting groove 33, and a connecting bearing 34 is installed in the connecting groove 33. Figure 7 shown.

[0046] Among them, the end of the connecting bearing 34 away from the connecting groove 33 is connected with a pressure-resistant bushing 35, and the pressure-resistant bushing 35 is preferably made of lightweight material. The pressure-resistant bushing 35 rotates around the connecting bearing 34, and the pressure-resistant bushing 35 is inserted into the pipe 7 through horizontal movement (the inner diameters of the pressure-resistant bushing 35 and the pipe 7 are adapted, and after the two are assembled, there is a certain friction resistance between the two, and relative movement does not occur easily). The left end face of the guide seat 5 is provided with a circular opening 82 for the push rod 31 and the pressure-resistant bushing 35 to move. The circular opening 82 is connected to the pipeline slide 3 with the same height, which plays a role of limiting guidance, such as Figure 1 , 2 and 7.

[0047] Furthermore, a receiving groove 81 is symmetrically provided on the left end of the pipeline slide 3 and close to the discharge port 10. The receiving groove 81 plays a role of limiting storage. An automatic limiter 9 is installed in each group of the receiving grooves 81. Figure 1 and 8 As shown.

[0048] Specifically, the automatic limiter 9 includes a displacement block 91, a return spring 92, a pressure-bearing surface 93, a large arc contact surface 94 and a small arc contact surface 95. Fig. 9 shown.

[0049] In this embodiment, the displacement block 91 is located in the receiving groove 81 and partially extends out of the receiving groove 81. The side of the displacement block 91 is connected to the inner groove wall of the receiving groove 81 through a plurality of groups of return springs 92. After being compressed, the return spring 92 can generate an elastic force to drive the displacement block 91 to return. The right end of the displacement block 91 is provided with a pressure-bearing surface 93 acting on the end of the pipe fitting 7 to play a blocking role.

[0050] In this embodiment, a large arc contact surface 94 and a small arc contact surface 95 (the small arc contact surface 95 is closer to the center of the circle) are sequentially arranged on the inner side of the displacement block 91. There is a smooth transition between the large arc contact surface 94 and the small arc contact surface 95. Both arc surfaces are smooth. The large arc contact surface 94 interacts with the end of the pipe fitting 7, and the small arc contact surface 95 interacts with the end of the pressure-resistant bushing 35.

[0051] Furthermore, two sets of limiting rails 80 are symmetrically arranged on the left side of the support platform 2, and the grinding wheel seat 40 and the guide wheel seat 41 are respectively installed in the two sets of limiting rails 80. The grinding wheel seat 40 and the guide wheel seat 41 move linearly between the two sets of limiting rails 80. Figure 1 ,2 and 10.

[0052] The grinding wheel seat 40 is provided with a first wheel housing 42, a grinding wheel 43 is provided in the first wheel housing 42, and a driving structure 85 acting on the grinding wheel 43 is provided on the outer side of the first wheel housing 42. Figure 1 , 2 and 10.

[0053] The guide wheel seat 41 is provided with a second wheel housing 44, a guide wheel 44 is provided in the second wheel housing 44, a motor is provided on the second wheel housing 44, the grinding wheel 43 and the guide wheel 44 rotate in the same direction, and act together on the outer surface of the pipe 7, as shown in FIG. Figure 1 , 2 and 10.

[0054] Among them, a transition support frame acting on the pipe fitting 7 is arranged at a lower position between the grinding wheel 43 and the guide wheel 44. The transition support frame connects the arc-shaped material guide groove 48 and the pipeline slide 3 into a line, playing a role of auxiliary support and guidance.

[0055] Furthermore, the bottom of the grinding wheel seat 40 and the guide wheel seat 41 are riveted with a movable platform 50, and the upper end surface of the base 1 is provided with a strip-shaped adjustment groove for the linear movement of the two sets of movable platforms 50, and the strip-shaped adjustment groove plays a role of limiting guide, such as Fig.10 shown.

[0056] In this embodiment, screw nut sleeves 51 (nuts with spiral motion are arranged inside the screw nut sleeves 51) are installed in the two groups of moving platforms 50. The two groups of screw nut sleeves 51 are for the same group of bidirectional screws 52 to pass through. The bidirectional screw 52 is located inside the base 1. Several groups of positive spiral patterns 53 and reverse spiral patterns 54 are symmetrically distributed on the bidirectional screw 52. The positive spiral patterns 53 and reverse spiral patterns 54 act on the two groups of screw nut sleeves 51 respectively. Both ends of the bidirectional screw 52 are fixed by the second bearing seat 55 and the inner wall of the base 1. One end of the bidirectional screw 52 extends outward and is connected to a screw adjustment motor 56 through a coupling. The screw adjustment motor 56 is located inside the base 1. Fig.10 shown.

[0057] Furthermore, a positioning seat 46 is horizontally installed in the left area between the grinding wheel 43 and the guide wheel 44, and a centerless support platform 47 is arranged on the upper end of the positioning seat 46. An arc-shaped guide groove 48 acting on the pipe fitting 7 is opened upward inside the centerless support platform 47, and a plurality of groups of side straightening wheels 84 acting on the pipe fitting 7 are symmetrically installed on the groove wall of the arc-shaped guide groove 48, which play a role in guiding and straightening. Figure 1 and 2 shown.

[0058] Furthermore, a feeding port 83 communicating with the arrangement chamber 12 is provided on the upper side of the outer side of the box body 11. Figure 2 shown.

[0059] When this embodiment is in use, the pipe fittings 7 are first placed in sequence from the feeding port 83 into the arrangement chamber 12 and arranged up and down. Under the action of the curved pressure plate 19, a group of pipe fittings 7 at the lowest position enters the pipeline slide 3 from the discharge port 10. At this time, the uniform speed motor 25 is started, causing the small gear 24 to rotate, and the large gear 23 to slow down the movement through engagement, thereby driving the cylindrical rotating seat 20 to slowly perform a circular motion. During the movement of the cylindrical rotating seat 20, the rotary slide 26 and the driving slider 32 interact with each other, causing the push rod 31 to first move to the left in the limiting guide sleeve 30, driving the pressure-resistant bushing 35 to extend out of the circular opening 82 and enter the interior of the pipeline slide 3.

[0060] At this time, one end of the pipe fitting 7 is in conflict with the pressure-bearing surface 93 of the two groups of automatic limiters 9, playing a blocking role, so that the pressure-resistant bushing 35 enters the pipe fitting 7 while continuing to move to the left, overcomes the friction resistance between the two and moves inside the pipe fitting 7 (the friction resistance is much smaller than the thrust of the push rod 31), until the pressure-resistant bushing 35 just passes through the pipe fitting 7, forming an inner lining for the pipe fitting 7. When the pressure-resistant bushing 35 continues to move to the left and extends out of the pipe fitting 7, it will contact the small arc contact surface 95 of the two groups of automatic limiters 9, and a relative force is generated between the two, so that the two groups of displacement blocks 91 are peeled off a certain distance respectively, so that the end face of the pipe fitting 7 leaves the pressure-bearing surface 93 and is located within the range of the large arc contact surface 94, and the pipe fitting 7 loses its restraint. At this time, the pipe fitting 7 will move to the left with the pressure-resistant bushing 35, and use the outer tube surface of the pipe fitting 7 to contact the large arc contact surface 94 and the small arc contact surface 95 in sequence, completely stretching out the two groups of displacement blocks 91 (the displacement blocks 91 are squeezed and recovered into the receiving groove 81).

[0061] Then, under the push of the push rod 31, the pipe fitting 7 and the pressure-resistant bushing 35 move together to between the grinding wheel 43 and the guide wheel 44, and the pipe fitting 7 is subjected to unintentional contact between the two. At this time, by starting the screw adjustment motor 56, the bidirectional screw 52 is driven to rotate, causing the two groups of moving platforms 50 to make opposite or opposite displacements along the bidirectional screw 52 (the screw nut sleeve 51 acts on the positive spiral pattern 53 and the reverse spiral pattern 54 respectively), thereby driving the upper grinding wheel seat 40 and the guide wheel seat 41 to move along the limiting track 80 to change the spacing between the grinding wheel 43 and the guide wheel 44, and timely perform adaptive distance adjustment, and can effectively adjust according to pipe fittings 7 of different sizes.

[0062] The motors on the grinding wheel seat 40 and the guide wheel seat 41 are started at the same time, and the guide wheel 44 and the grinding wheel 43 are driven to move in the same direction at a slow speed through transmission. When the outer surface of the pipe 7 contacts the two, it produces a movement of rotating and displacing to the left (at this time, the pipe 7 and the pressure-resistant bushing 35 rotate together around the connecting bearing 34, and the push rod 31 can provide auxiliary thrust). With the protection of the pressure-resistant bushing 35, the purpose of grinding and transporting is achieved (the grinding wheel 43 is responsible for grinding the outer surface of the pipe 7). The ground pipe fittings 7 enter the arc-shaped guide groove 48 of the centerless support table 47 to support and guide the grinding process until the pipe fittings 7 are completely ground and guided outward. When the push rod 31 enters the pipeline slide 3, the push rod 31 supports the multiple groups of pipe fittings 7 in the upper arrangement chamber 12. When the push rod 31 drives the pressure-resistant bushing 35 to return and evacuate the pipeline slide 3, under the pressure of the curved pressure plate 19, the bottom group of pipe fittings 7 are replaced in the pipeline slide 3, forming a continuous feeding process. Embodiment 2

[0063] On the basis of the first embodiment, a plurality of groups of connecting inserts 60 are welded to one end of the connecting bearing 34 away from the connecting groove 33, and each group of connecting inserts 60 is provided with a positioning hole 61. Fig.11 shown.

[0064] Furthermore, a rectangular slot 62 corresponding to the connecting insert 60 is provided on one end surface of the compression sleeve 35 close to the connecting bearing 34, and a linkage self-locking device 64 is horizontally arranged at the center position of a plurality of groups of the rectangular slots 62, such as Fig.11 shown.

[0065] Specifically, the linkage self-locking device 64 includes a servo motor 640, a rotating shaft 641, a third bearing seat 642, a crank cone 643, a cam surface 644 and a step 645. Fig.12 shown.

[0066] In this embodiment, a servo motor 640 is horizontally installed at the inner center position of the pressure-resistant bushing 35 , and a rotating shaft 641 on the servo motor 640 extends horizontally outward, and the end of the rotating shaft 641 is fixed by a third bearing seat 642 and the inner wall of the pressure-resistant bushing 35 .

[0067] In this embodiment, a crank cone 643 is sleeved on the rotating shaft 641, and a plurality of groups of cam surfaces 644 (arc surfaces with a set slope) are evenly distributed on the circumferential surface of the crank cone 643. A stop step 645 is provided at one end of each group of cam surfaces 644. The stop step 645 is used to limit the rotation angle of the crank cone 643 and block the lock column 646.

[0068] Furthermore, the linkage self-locking device 64 also includes a locking column 646, a locking head 647, a spring sleeve 648 and a spring 649. Fig.12 shown.

[0069] In this embodiment, a column hole 63 for the movement of the lock column 646 is opened on the inner groove surface of the rectangular slot 62, one end of the lock column 646 is in contact with the cam surface 644, and a locking head 647 is provided at the end of the lock column 646 extending out of the column hole 63, and the locking head 647 is inserted into the corresponding positioning hole 61, and a spring sleeve 648 is fixedly provided in the middle of the lock column 646, and a spring 649 is fixed between the spring sleeve 648 and the bottom of the column hole 63 and is sleeved on the outside of the lock column 646. The spring 649 is used to maintain the contact force between the lock column 646 and the circumferential surface of the crank cone 643.

[0070] When the present embodiment is used, the connecting plug 60 is first inserted into the corresponding rectangular slot 62, and then the servo motor 640 is started, and the rotating shaft 641 drives the crank truncated table 643 to rotate a certain angle, so that the plurality of lock pins 646 slide relatively on their respective cam surfaces 644, causing each group of lock pins 646 to extend out of the column hole 63 at the same time (compressing the spring 649 at the same time), and the lock head 647 is inserted into the corresponding positioning hole 61 to complete the connection between the compression bushing 35 and the connecting bearing 34. When the pipe 7 When it moves to between the grinding wheel 43 and the guide wheel 44 together with the anti-pressure bushing 35, the servo motor 640 is rotated in the opposite direction. After a series of transmissions, the lock column 646 and the cam surface 644 are separated instantly. Driven by the reset elastic force of the spring 649, each group of lock columns 646 is retracted into the column hole 63, and the lock head 647 withdraws from the positioning hole 61. At this time, the push rod 31 will separate from the anti-pressure bushing 35 during the process of returning to the right in a straight line (the connecting plug 60 is taken out of the rectangular slot 62), completing the automatic disassembly. Embodiment 3

[0071] On the basis of the first and second embodiments, due to the irregular protrusions on the surface of the pipe 7, the pipe 7 will cause jumping and deviation during rotation grinding, and the existing centerless support table 47 cannot be adjusted according to the actual situation to obtain more effective support and limit, which reduces the grinding effect. In order to solve the above technical problems, we have the following design, such as Figure 13-15 shown.

[0072] Specifically, the upper end surface of the positioning seat 46 is provided with a rotation groove 86 for the centerless support platform 47 to move, and the centerless support platform 47 can slightly swing in the rotation groove 86. An adjustment shaft 70 is installed through the lower position of the centerless support platform 47. The two ends of the adjustment shaft 70 passing through the centerless support platform 47 are fixed by damping bearings 71 and the inner wall of the positioning seat 46. The damping bearing 71 has a certain rotation resistance to prevent the centerless support platform 47 from rotating and improve its stability. Fig.13 and 14 shown.

[0073] Furthermore, an inner notch 87 is provided at the bottom of the centerless support platform 47, and a precision gear 72 is sleeved on the adjustment shaft 70 at the position of the inner notch 87, which is a high-precision gear. Fig.14 and 15 shown.

[0074] The lower end of the precision gear 72 is meshed with a long tooth rod 73, and the upper end surface of the long tooth rod 73 is equidistantly provided with a plurality of groups of fine teeth 74. A connecting rod 75 is horizontally welded to one end of the long tooth rod 73. A guide rod groove 79 acting on the connecting rod 75 is provided on the side of the positioning seat 46. An adjusting handle 76 is installed at the end of the connecting rod 75 away from the long tooth rod 73. Fig.14 and 15 shown.

[0075] The interior of the positioning seat 46 is riveted with a clip 77, on which a tactile steel sheet 78 is clamped. The tactile steel sheet 78 is made of spring steel and has the performance of repeated deformation and reset. The lower end of the tactile steel sheet 78 acts on the gap between adjacent fine teeth 74. Fig.15 shown.

[0076] When the present embodiment is in use, when the pipe 7 starts to be ground, the adjusting handle 76 is held by hand, and the connecting rod 75 is pushed or pulled to make the long tooth rod 73 move linearly along the flat track, and the long tooth rod 73 is meshed with the precision gear 72, so that the adjusting shaft 70 drives the centerless support platform 47 to swing slightly (swing sideways) to adapt to the position of the pipe 7, so that the pipe 7 can contact the side straightening wheels 84 on both sides at the same time, thereby ensuring the movement stability of the pipe 7 and making the grinding more sufficient. During the adjustment process, the tactile steel sheet 78 will produce an extrusion effect with the side of the fine teeth 74, obtain resistance during adjustment (the force is transmitted to the operator), cause the tactile steel sheet 78 to deform, pass over the group of fine teeth 74, and the resistance disappears instantly, waiting to contact the next group of adjacent fine teeth 74, so that the operator can accurately control the force of the operation and finely adjust the degree of adjustment of each tooth to achieve the purpose of fine adjustment, with high flexibility.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipes, comprising a base (1), characterized in that: A support platform (2) is fixedly provided at the middle of the upper end surface of the base (1), a pipe slideway (3) is provided at the middle position of the upper end surface of the support platform (2), a continuous discharge box (4) is vertically riveted to the upper end of the support platform (2), the continuous discharge box (4) comprises a box body (11), an arrangement chamber (12) for storing pipe fittings (7) is provided inside the box body (11), two groups of limit rod holes (13) connected to the arrangement chamber (12) are symmetrically provided on the upper end surface of the continuous discharge box (4), each group of the limit rod holes (13) is for a pressure rod (14) to pass through, and the lower ends of the two groups of pressure rods (14) are connected to a curved pressure plate (12) acting on the pipe fittings (7). 19), the upper ends of the two groups of pressure rods (14) are commonly connected to a top plate (15), four groups of No. 1 spring seats (16) are symmetrically welded on both sides of the top plate (15), four groups of No. 2 spring seats (17) are symmetrically welded on both sides of the box body (11), and the No. 1 spring seats (16) and No. 2 spring seats (17) corresponding to each other are connected by a tension spring (18), a discharge port (10) connected to the pipeline slide (3) is provided at the bottom of the continuous discharge box (4), and a receiving groove (81) is symmetrically provided on the left end of the pipeline slide (3) near the discharge port (10), and an automatic limiter (9) is installed in each group of the receiving grooves (81); Two groups of limiting rails (80) are symmetrically arranged on the left side of the support platform (2), and a grinding wheel seat (40) and a guide wheel seat (41) are respectively installed in the two groups of limiting rails (80), a first wheel shell (42) is installed on the grinding wheel seat (40), a grinding wheel (43) is installed in the first wheel shell (42), a second wheel shell (44) is installed on the guide wheel seat (41), and a guide wheel (44) is installed in the second wheel shell (44), and the grinding wheel (43) and the guide wheel (44) rotate in the same direction and act together on the outer surface of the pipe (7); A positioning seat (46) is horizontally mounted in the left region between the grinding wheel (43) and the guide wheel (44), a centerless support platform (47) is arranged at the upper end of the positioning seat (46), and an arc-shaped material guide groove (48) is opened upward inside the centerless support platform (47) for acting on the pipe (7).

2. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 1 is characterized in that: A guide seat (5) is fixed to the horizontal right side of the continuous discharge box (4), and the upper end of the guide seat (5) is connected to a cylindrical shell seat (6), and a cylindrical rotating seat (20) is rotatably arranged inside the cylindrical shell seat (6). Short shafts (21) are symmetrically welded at both ends of the cylindrical rotating seat (20), and each group of the short shafts (21) is fixed by a first bearing seat (22) and the inner wall of the cylindrical shell seat (6). One group of the short shafts (21) extends outward and is sleeved with a large gear (23), and a small gear (24) is meshed at the lower end of the large gear (23), and the small gear (24) is sleeved on the output shaft of a uniform speed motor (25). The uniform speed motor (25) is arranged to pass through the outer surface of the guide seat (5), and a rotary slide groove (26) is opened on the cylindrical rotating seat (20).

3. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 2 is characterized in that: A limit guide sleeve (30) is horizontally installed inside the guide seat (5), a push rod (31) is movably arranged inside the limit guide sleeve (30), a driving slider (32) extending into the rotary slide groove (26) is welded to the right end of the push rod (31), a connecting groove (33) is provided on the left end surface of the push rod (31), a connecting bearing (34) is installed in the connecting groove (33), a pressure-resistant bushing (35) is connected to the end of the connecting bearing (34) away from the connecting groove (33), and the pressure-resistant bushing (35) is inserted into the pipe (7) through horizontal movement, and a circular opening (82) for the push rod (31) and the pressure-resistant bushing (35) to move is provided on the left end surface of the guide seat (5), and the circular opening (82) is butted against the pipeline slideway (3).

4. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 3 is characterized in that: The automatic limiter (9) comprises a displacement block (91), a return spring (92), a pressure-bearing surface (93), a large arc contact surface (94) and a small arc contact surface (95). The displacement block (91) is located in the receiving groove (81) and partially extends out of the receiving groove (81). The side surface of the displacement block (91) is connected to the inner groove wall of the receiving groove (81) through a plurality of groups of return springs (92). The right end of the displacement block (91) is provided with a pressure-bearing surface (93) that acts on the end of the pipe fitting (7). The inner side of the displacement block (91) is provided with a large arc contact surface (94) and a small arc contact surface (95) in sequence. The large arc contact surface (94) and the small arc contact surface (95) have a smooth transition. The large arc contact surface (94) and the end of the pipe fitting (7) act on each other, and the small arc contact surface (95) and the end of the pressure-resistant bushing (35) act on each other.

5. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 1 is characterized in that: The bottoms of the grinding wheel seat (40) and the guide wheel seat (41) are riveted with movable platforms (50), the upper end surface of the base (1) is provided with strip-shaped adjustment grooves for allowing the two sets of movable platforms (50) to move linearly, and the two sets of movable platforms (50) are both installed with screw nut sleeves (51), and the two sets of screw nut sleeves (51) allow the same set of bidirectional screws (52) to pass through, and the bidirectional screws (52) are located inside the base (1), and the bidirectional screws (52) are symmetrically distributed on the bidirectional screws (52). There are a plurality of groups of forward spiral patterns (53) and reverse spiral patterns (54), the forward spiral patterns (53) and reverse spiral patterns (54) respectively interact with two groups of screw nut sleeves (51), both ends of the bidirectional screw (52) are fixed by a second bearing seat (55) and the inner wall of the base (1), one end of the bidirectional screw (52) extends outward and is connected to a screw adjustment motor (56) through a coupling, and the screw adjustment motor (56) is located inside the base (1).

6. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 3 is characterized in that: A plurality of groups of connecting inserts (60) are welded to one end of the connecting bearing (34) away from the connecting groove (33), and a positioning hole (61) is provided on each group of the connecting inserts (60). A rectangular slot (62) corresponding to the connecting insert (60) is provided on one end surface of the pressure-resistant bushing (35) close to the connecting bearing (34), and a linkage self-locking device (64) is horizontally arranged at the center position of the plurality of groups of the rectangular slots (62).

7. The outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines according to claim 6 is characterized in that: The linked self-locking device (64) comprises a servo motor (640), a rotating shaft (641), a third bearing seat (642), a crank cone (643), a cam surface (644) and a step (645); the servo motor (640) is horizontally mounted at the inner center of the pressure-resistant bushing (35); the rotating shaft (641) on the servo motor (640) extends horizontally outward; the end of the rotating shaft (641) is fixed by the third bearing seat (642) and the inner wall of the pressure-resistant bushing (35); the crank cone (643) is sleeved on the rotating shaft (641); a plurality of groups of cam surfaces (644) are evenly distributed on the circumferential surface of the crank cone (643); and a step (645) is provided at one end of each group of cam surfaces (644).

8. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 8 is characterized in that: The linked self-locking device (64) further comprises a locking column (646), a locking head (647), a spring sleeve (648) and a spring (649); a column hole (63) for movement of the locking column (646) is provided on the inner groove surface of the rectangular slot (62); one end of the locking column (646) contacts the cam surface (644); one end of the locking column (646) extending out of the column hole (63) is provided with a locking head (647); the locking head (647) is inserted into the corresponding positioning hole (61); a spring sleeve (648) is fixedly provided in the middle of the locking column (646); a spring (649) sleeved on the outside of the locking column (646) is fixedly provided between the spring sleeve (648) and the bottom of the column hole (63).

9. The outer surface grinding equipment for electrolytic polishing pretreatment of stainless steel pipelines according to claim 1 is characterized in that: The upper end surface of the positioning seat (46) is provided with a rotating groove (86) for the centerless support platform (47) to move, and an adjusting shaft (70) is installed through the lower position of the centerless support platform (47). Both ends of the adjusting shaft (70) passing through the centerless support platform (47) are fixed by damping bearings (71) and the inner wall of the positioning seat (46). The bottom of the centerless support platform (47) is provided with an inner recess (87), and a precision gear (72) is sleeved on the adjusting shaft (70) located at the position of the inner recess (87).

10. The outer surface grinding device for electrolytic polishing pretreatment of stainless steel pipelines according to claim 9, characterized in that: The lower end of the precision gear (72) is meshed with a long tooth rod (73), and the upper end surface of the long tooth rod (73) is equidistantly provided with a plurality of groups of fine teeth (74), one end of the long tooth rod (73) is horizontally welded with a connecting rod (75), a side surface of the positioning seat (46) is provided with a guide rod groove (79) acting on the connecting rod (75), an adjustment handle (76) is installed at one end of the connecting rod (75) away from the long tooth rod (73), a clip (77) is riveted inside the positioning seat (46), a tactile steel sheet (78) is clamped on the clip (77), the lower end of the tactile steel sheet (78) acts on the gap between adjacent fine teeth (74), and the tactile steel sheet (78) has deformation restoring properties.

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