Drawing trolley cam operating device

Abstract

The present invention discloses a cam operation device for a drawing trolley, comprising: two drawing trolleys, the drawing trolleys are arranged in a straight line, wherein each of the drawing trolleys comprises a matching portion; two cam units, the cam units are arranged in a straight line and rotatably arranged, each of the cam units comprises a guide portion, each of the guide portions is respectively connected to a matching portion, the guide portion surrounds and is closed and connected along the circumference of the cam unit, wherein in the circumference of the cam unit, the position of the guide portion in the axial direction of the cam unit is changed. The clamp of the present invention is constrained from the outside by two outer constraining surfaces of the base, and constrained from the inside by the inner part. Neither the base nor the inner part is a power component, so there will be no looseness, thereby achieving stable clamping of the rod. The power component only performs linear reciprocating motion in a single direction, so the structure is simple, it is not easy to cause motion failure, and it is also easy to maintain.

Description

Technical Field

[0001] The invention relates to a cam operating device for a drawing trolley Background Art

[0002] Metal material drawing is an important means of material processing, which can achieve the three purposes of material strengthening, sizing and surface reduction. In the existing drawing technology, metal material drawing mainly goes through two processes, namely, head making and drawing.

[0003] For straight bars, the heads are usually made by cold rolling or hot rolling outside the line. Then the chain drawing machine is used to draw - empty car return - draw again - empty car return again and draw again. Through this reciprocating intermittent method, the drawing production process is realized.

[0004] Usually, reciprocating movement needs to be achieved through cylinders or linear motors. However, the handover between multiple drawing trolleys requires high matching accuracy to maintain synchronous operation, and the control cost of using existing equipment is very high. In addition, if there is a problem with the operation of the driving device of any drawing trolley, it may cause the matching trolley to fail to match, which may cause damage to the bar at the least and damage to the drawing trolley at the worst. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a cam operating device for a drawing trolley in order to overcome the defects of the prior art that the control accuracy of the trolley is high, synchronization is difficult, and the rod and the drawing trolley are easily damaged.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A drawing trolley cam operating device, used for drawing bars, is characterized in that the drawing trolley cam operating device comprises:

[0008] Two drawing carriages, the drawing carriages are arranged in a straight line, wherein each of the drawing carriages comprises a mating portion;

[0009] Two cam units are arranged in a straight line and rotatably arranged, each of the cam units comprises a guide portion, each of the guide portions is respectively connected to a matching portion, the guide portion surrounds and is closed and connected along the circumference of the cam unit, wherein, in the circumference of the cam unit, the position of the guide portion in the axial direction of the cam unit is changed.

[0010] In this solution, the movement of the two drawing trolleys is guided by the guide part of the cam unit. Since the point at which the cam unit contacts the drawing trolley changes during the rotation process, after the position of each point of the guide part in the circumferential direction changes relative to the axial direction, the position of the drawing trolley will also change in the corresponding axial direction, thereby realizing the movement of the drawing trolley.

[0011] Since the trajectory of the guide part of the cam unit is fixed and pre-set, the movement of the drawing carriage is also stably set. Using the existing motor and closed-loop control, the rotation control of the two cam units can be easily achieved, so the precise movement between the two drawing carriages can be achieved by simply matching the rotation of the two cam units.

[0012] Preferably, the two cam units are arranged to rotate synchronously, wherein in the circumferential direction of the cam unit, the axial distance between the two guide parts varies between a maximum distance and a minimum distance. The cam units arranged to rotate synchronously can ensure that the two drawing carriages are in synchronous operation at any time and any place, further reducing the control difficulty under the premise of ensuring accuracy.

[0013] Preferably, along the circumference of the cam unit, the axial distance between the two guide parts continuously increases from the minimum distance to the maximum distance, and continuously decreases from the maximum distance to the minimum distance. Since the guide part of the cam unit will repeatedly guide when rotating, it is only necessary to set the maximum distance and the minimum distance to ensure operation, and the transition between the maximum distance and the minimum distance can be freely set according to various situations, thereby improving compatibility.

[0014] Preferably, each of the cam units includes a rotating shaft, and the rotating shafts of the two cam units are connected by a connecting unit so that the two cam units rotate synchronously. The movements of the two drawing carriages are completely bound together by physical synchronization. When a failure occurs, if one of the drawing carriages does not move, the other drawing carriage must also stop moving, which can avoid damage to the rod and protect the drawing carriage from damage.

[0015] Preferably, a supporting unit is arranged between the cam units, the connecting unit is cylindrical in shape, the supporting unit has a circular hole, and the connecting unit is accommodated in the circular hole of the supporting unit. The supporting unit can support the connecting unit to improve the connection strength.

[0016] Preferably, the distance between the two guide surfaces in the axial direction of each guide portion is kept the same in the circumferential direction, wherein the matching portion is respectively fitted with the two guide surfaces from both sides. The two guide surfaces can ensure that the matching portion is limited to move on both sides thereof, and the guide surfaces on both sides respectively provide driving force in the forward and reverse movement of the drawing carriage, thereby ensuring the continuity of the movement.

[0017] Preferably, the matching portion includes two rollers, which are respectively fitted with the two guide surfaces from both sides and are arranged to roll along the guide surfaces. The rollers can reduce friction between the rollers and the guide surfaces, reduce wear of the guide surfaces, and avoid precision impact caused by wear of the guide surfaces.

[0018] Preferably, the two guide surfaces of each guide portion are curved surfaces. The curved guide surface can make the roller roll more smoothly and avoid the force generated when driving the pulling trolley to be concentrated on a certain point of the guide surface.

[0019] Preferably, the drawing trolley is connected to a bar clamping device, and the bar clamping device comprises:

[0020] Two clamps, the clamps are used to clamp the rod, wherein the outer surfaces of the two clamps are inclined, and the outer surfaces of the two clamps are narrowed along a first direction, and the first direction is parallel to the arrangement direction of the drawing carriage;

[0021] A base, wherein the base has a cavity inside for accommodating the clamp, the cavity has two outer constraint surfaces, the outer constraint surfaces are inclined surfaces that fit the outer surface of the clamp, and the two outer constraint surfaces are narrowed along a first direction;

[0022] an inner portion, the inner portion pressing the two clamps against the outer restraining surface from the inside;

[0023] A power component drives the clamp to reciprocate between a first direction and a direction opposite to the first direction.

[0024] In this solution, when the power component is driven along the first direction or in the reverse direction, the clamps move, and through the guidance of the outer constraint surface on the outside and the inner part on the inside, the clamps gradually approach each other when moving along the first direction, and gradually move away from each other when moving in the reverse direction of the first direction, thereby achieving the clamping and loosening of the clamps.

[0025] The clamp of this scheme is constrained from the outside by two outer constraining surfaces of the base and from the inside by the inner part. Neither the base nor the inner part is a power component, so there will be no looseness, thereby achieving stable clamping of the rod. The power component only performs linear reciprocating motion in a single direction, so the structure is simple, it is not easy to cause motion failure, and it is also easy to maintain.

[0026] Preferably, the inner portion has two inner constraint surfaces, the inner constraint surfaces are inclined surfaces, wherein the space between the two inner constraint surfaces narrows along the first direction. The inner constraint surfaces and the outer constraint surfaces together form a trend of narrowing along the first direction, thereby being able to stably push the clamp to narrow, avoiding looseness on the inner and outer sides, which affects stability.

[0027] Preferably, the clamp has an upper end cover and a lower end cover on the upper and lower sides, and at least one of the upper end cover and the lower end cover is provided with the inner side portion. The upper end cover and the lower end cover can seal the cavity of the base to prevent the clamp from falling off the base.

[0028] Preferably, a matching groove is formed between the inner constraint surface and the outer constraint surface, and an inner matching boss is formed on the upper surface and / or the lower surface of the clamp, and the inner matching boss is embedded in the matching groove and is relatively slidably arranged, wherein the matching groove is inclined, and the distance between the two matching grooves narrows along the first direction. Both sides of the inner matching boss are limited to guide the clamp to narrow in the first direction.

[0029] Preferably, the upper end cover and the lower end cover are fixedly connected to the upper end and the lower end of the base. The upper end cover, the base and the lower end cover can be fixed to form a whole, which can prevent the clamp from falling out of the base on the one hand, and on the other hand, the fixed upper end cover and the lower end cover can make the inner constraint surface relatively fixed, so as to guide the clamp to move more stably. The two sides of the base that are in contact with the inner mating boss are provided with outer mating bosses, and at least one of the upper end cover and the lower end cover is provided with an outer side, wherein the inner mating boss and the outer mating boss are clamped between the outer side and the inner side. In addition to guiding the clamp, the inner mating boss on the clamp is clamped by the inner side and the outer side of the integrated upper end cover together with the outer mating boss on the base, so that the base and the clamp are tightly combined through the upper end cover and / or the lower end cover, and the two-to-two interlocking between the end cover and / or the lower end cover, the base and the clamp is achieved, and the connection stability of the overall structure can be ensured.

[0030] Preferably, the distance between the inner surfaces of the outer portions is narrowed along the first direction, and the distance between the outer surfaces of the outer mating bosses is narrowed along the first direction. Thus, when the upper end cover and / or the lower end cover are fixed to the base, loosening of the upper end cover and / or the lower end cover in the first direction or in the opposite direction of the first direction is avoided, thereby improving stability.

[0031] Preferably, the power component is connected to the two clamps through a transmission member, and drives the clamps to move along the first direction, the upper surface of the base is provided with an upper end cover or the lower surface of the base is provided with a lower end cover, and the transmission member is slidably provided on the upper end cover or the lower end cover. The transmission member can achieve stable reciprocating movement under the guidance of the guide rail or guide groove on the upper end cover and / or the lower end cover.

[0032] Preferably, the clamp is formed with a connecting boss, the transmission member is provided with a guide groove extending perpendicular to the first direction, the upper end cover or the lower end cover is formed with an exposure groove, the connecting boss passes through the exposure groove and is confined in the guide groove.

[0033] Due to the setting of the guide groove extending perpendicular to the first direction, the connecting boss is pushed by the transmission member in the first direction and the opposite force of the first direction during movement, and can move back and forth in the direction perpendicular to the first direction with the trend of narrowing or widening without causing motion interference.

[0034] The positive and progressive effect of the present invention is that in the present invention, the movement of the two drawing carriages is guided by the guide part of the cam unit, the rotation control of the two cam units can be simply realized, and the precise movement between the two drawing carriages can be realized by simply matching the rotation of the two cam units. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of the cam operating device of the drawing trolley according to a preferred embodiment of the present invention.

[0036] Figure 2 This is a schematic structural diagram of the drawing trolley cam unit according to a preferred embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the cooperation between the drawing trolley and the cam unit according to a preferred embodiment of the present invention.

[0038] Figure 4 The figure is a schematic diagram of the bottom structure of the drawing trolley according to a preferred embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of the overall structure of a rod clamping device according to a preferred embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of the exploded structure of a rod clamping device according to a preferred embodiment of the present invention.

[0041] Figure 7 This is a schematic diagram of the front view of the rod clamping device according to a preferred embodiment of the present invention.

[0042] Figure 8Schematic diagram of the matching structure of the clamp and the base according to a preferred embodiment of the present invention.

[0043] Fig. 9 Schematic diagram of the structure of the clamp according to a preferred embodiment of the present invention.

[0044] Fig.10 The figure is a schematic diagram of the bottom structure of the upper end cover according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0046] like Figure 1-Figure 10 As shown, the present invention discloses a drawing trolley cam operating device for drawing rods, such as Figure 1-Figure 4 As shown, the drawing trolley cam operating device of this embodiment includes two drawing trolleys 2 , and the drawing trolleys 2 are arranged in a straight line, wherein each drawing trolley 2 includes a matching portion 21 .

[0047] like Figure 1-Figure 4 As shown, the pulling trolley cam operating device of this embodiment includes two cam units 3, which are arranged in a straight line and rotatably arranged, and each cam unit 3 includes a guide portion 31, and each guide portion 31 is respectively connected to a matching portion 21, and the guide portion 31 surrounds and is closed along the circumference of the cam unit 3, wherein, in the circumference of the cam unit 3, the position of the guide portion 31 in the axial direction of the cam unit 3 is changed.

[0048] In this solution, the movement of the two drawing trolleys 2 is guided by the guide portion 31 of the cam unit 3. Since the point at which the cam unit 3 contacts the drawing trolley 2 changes during the rotation, after the position of each point of the guide portion 31 in the circumferential direction changes relative to the axial direction, the position of the drawing trolley 2 in the corresponding axial direction will also change, thereby realizing the movement of the drawing trolley 2.

[0049] Since the track of the guide part 31 of the cam unit 3 is fixed and pre-set, the movement of the drawing carriage 2 is also stably set. By using the existing motor and closed-loop control, the rotation control of the two cam units 3 can be easily achieved, so the precise movement between the two drawing carriages 2 can be achieved by simply matching the rotation of the two cam units 3.

[0050] In this embodiment, the two cam units 3 are synchronously rotated, wherein the axial distance between the two guide portions 31 varies between a maximum distance and a minimum distance in the circumferential direction of the cam unit 3. The synchronously rotated cam units 3 can ensure that the two drawing carriages 2 are synchronously operated at any time and any place, further reducing the control difficulty while ensuring accuracy.

[0051] like Figure 2 As shown, in this embodiment, along the circumference of the cam unit 3, the axial distance between the two guide portions 31 continuously increases from the minimum distance to the maximum distance, and continuously decreases from the maximum distance to the minimum distance. Since the guide portion 31 of the cam unit 3 repeatedly guides when rotating, it is only necessary to set the maximum distance and the minimum distance to ensure operation, and the transition between the maximum distance and the minimum distance can be freely set according to various situations, thereby improving compatibility.

[0052] like Figure 1 and Figure 2 As shown, the cam units 3 of this embodiment each include a rotating shaft 32, and the rotating shafts 32 of the two cam units 3 are connected by a connecting unit 4, so that the two cam units 3 rotate synchronously. The movements of the two drawing carriages 2 are completely bound together by physical synchronization. When a fault occurs, if one of the drawing carriages 2 does not move, the other drawing carriage 2 must also stop moving, which can avoid damage to the rod and protect the drawing carriage 2 from damage.

[0053] like Figure 1 As shown, a support unit 5 is disposed between the cam units 3 of this embodiment, the connection unit 4 is cylindrical in shape, the support unit 5 has a circular hole, and the connection unit 4 is accommodated in the circular hole of the support unit 5. The support unit 5 can support the connection unit 4 to improve the connection strength.

[0054] like Figure 2 As shown, the distance between the two guide surfaces 311 in the axial direction of each guide portion 31 of this embodiment remains the same in the circumferential direction, wherein the matching portion 21 is respectively fitted with the two guide surfaces 311 from both sides. The two guide surfaces 311 can ensure that the matching portion 21 is limited to move on both sides thereof, and the guide surfaces 311 on both sides respectively provide driving force in the forward and reverse movement of the drawing carriage 2, thereby ensuring the continuation of the movement.

[0055] like Figure 3 and Figure 4 As shown, the mating portion 21 of this embodiment includes two rollers, which are respectively fitted with two guide surfaces 311 from both sides and are arranged to roll along the guide surfaces 311. The rollers can reduce the friction between the guide surfaces 311, reduce the wear of the guide surfaces 311, and avoid the accuracy impact caused by the wear of the guide surfaces 311.

[0056] like Figure 2 As shown, the two guide surfaces 311 of each guide portion 31 of this embodiment are curved surfaces. The curved guide surface 311 can make the roller roll more smoothly and avoid the force generated when driving the pulling trolley 2 to be concentrated on a certain point of the guide surface 311.

[0057] like Figure 5-Figure 10 As shown, the present invention discloses a bar clamping device 1, wherein, as Figure 5 and Figure 6 As shown, the bar clamping device 1 of this embodiment includes two clamps 11, and the clamps 11 are used to clamp the bar, wherein the outer surfaces of the two clamps 11 are both inclined surfaces, and the outer surfaces of the two clamps 11 are narrowed along the first direction.

[0058] like Figure 5 and Figure 6 As shown, the bar clamping device 1 of this embodiment includes a base 12, the base 12 has a cavity 10 for accommodating the clamp 11, the cavity 10 has two outer constraint surfaces 121, the outer constraint surfaces 121 are inclined surfaces that fit the outer surface of the clamp 11, and the two outer constraint surfaces 121 are connected along the first direction (in this embodiment) Figure 1 It narrows from the upper right to the lower left.

[0059] like Figure 5 and Figure 6 As shown, the bar clamping device 1 of this embodiment includes an inner portion 131 (or an inner portion 141 ), and the inner portion 131 (or an inner portion 141 ) presses the two clamps 11 against the outer constraint surface 121 from the inside.

[0060] like Figure 5 and Figure 6 As shown, the bar clamping device 1 of this embodiment includes a power component 14, and the power component 14 drives the clamp 11 to reciprocate between a first direction and a reverse direction of the first direction.

[0061] In this solution, when the power component 14 is driven along the first direction or in the reverse direction, the clamp 11 moves, and under the guidance of the outer constraint surface 121 on the outer side and the inner side portion 131 (or the inner side portion 141) on the inner side, the clamps 11 gradually approach each other when moving along the first direction, and gradually move away from each other when moving in the reverse direction of the first direction, thereby realizing the clamping and loosening of the clamp 11.

[0062] The clamp 11 of this solution is constrained from the outside by two outer constraining surfaces 121 of the base 12, and constrained from the inside by the inner part 131 (or the inner part 141). Neither the base 12 nor the inner part 131 (or the inner part 141) is the power component 14, so there will be no looseness, thereby achieving stable clamping of the rod. The power component 14 only performs linear reciprocating motion in a single direction, so the structure is simple, it is not easy to cause motion failure, and it is also easy to maintain.

[0063] like Figure 6 or Fig.10As shown, the inner portion 131 (or the inner portion 141) of this embodiment has two inner constraint surfaces 132 (or the inner constraint surfaces 142), and the inner constraint surfaces 132 (or the inner constraint surfaces 142) are inclined surfaces, wherein the two inner constraint surfaces 132 (or the inner constraint surfaces 142) narrow along the first direction. The inner constraint surfaces 132 (or the inner constraint surfaces 142) and the outer constraint surface 121 form a trend of narrowing along the first direction, thereby being able to stably push the clamp 11 to narrow, and avoid looseness on the inner and outer sides, which affects stability.

[0064] like Figure 5 or Figure 6 As shown, the clamp 11 of this embodiment has an upper end cover 13 and a lower end cover 14 on the upper and lower sides, and at least one of the upper end cover 13 and the lower end cover 14 is provided with an inner side portion 131 (or inner side portion 141). The upper end cover 13 and the lower end cover 14 can close the cavity 10 of the base 12 to prevent the clamp 11 from falling off the base 12.

[0065] like Figure 7 As shown, a matching groove is formed between the inner constraint surface 132 (or the inner constraint surface 142) and the outer constraint surface 121 of this embodiment, and an inner matching boss 112 is formed on the upper surface and / or the lower surface of the clamp 11. The inner matching boss 112 is embedded in the matching groove and is relatively slidably arranged, wherein the matching groove is inclined, and the distance between the two matching grooves narrows along the first direction. Both sides of the inner matching boss 112 are limited to guide the clamp 11 to narrow in the first direction.

[0066] like Figure 5 and Figure 6 As shown, the upper end cover 13 and the lower end cover 14 of this embodiment are fixedly connected to the upper end and the lower end of the base 12. The upper end cover 13, the base 12 and the lower end cover 14 can be fixed to form a whole, which can prevent the clamp 11 from falling out of the base 12 on the one hand, and on the other hand, the fixed upper end cover 13 and the lower end cover 14 can make the inner constraint surface 132 (or the inner constraint surface 142) relatively fixed, so as to guide the movement of the clamp 11 more stably.

[0067] like Figure 6 , Figure 7 and Fig.10As shown, the base 12 of this embodiment has outer mating bosses 122 on both sides that are in contact with the inner mating boss 112, and at least one of the upper end cover 13 and the lower end cover 14 is provided with an outer portion 133 (or outer portion 143), wherein the inner mating boss 112 and the outer mating boss 122 are clamped between the outer portion 133 (or outer portion 143) and the inner portion 131 (or inner portion 141). In addition to guiding the clamp 11, the inner mating boss 112 on the clamp 11 is also clamped together with the outer mating boss 122 on the base 12 by the inner portion 131 (or inner portion 141) and the outer portion 133 (or outer portion 143) of the integrated upper end cover 13, so that the base 12 and the clamp 11 are tightly combined together through the upper end cover 13 and / or the lower end cover 14, thereby achieving interlocking between the end cover and / or the lower end cover 14, the base 12 and the clamp 11, thereby ensuring the connection stability of the overall structure.

[0068] like Figure 6 or Fig.10 As shown, the distance between the inner surfaces of the outer side portion 133 (or the outer side portion 143) of this embodiment is narrowed along the first direction, and the distance between the outer side surfaces of the outer mating boss 122 is narrowed along the first direction. Therefore, when the upper end cover 13 and / or the lower end cover 14 are already fixed to the base 12, the upper end cover 13 and / or the lower end cover 14 are prevented from loosening in the first direction or in the opposite direction of the first direction, thereby improving stability.

[0069] like Figure 5 and Figure 6 As shown, the power component 14 of this embodiment is connected to the two clamps 11 through a transmission member 15, and drives the clamps 11 to move along the first direction. The upper surface of the base 12 is provided with an upper end cover 13 or the lower surface of the base 12 is provided with a lower end cover 14, and the transmission member 15 is slidably provided on the upper end cover 13 or the lower end cover 14. The transmission member 15 can achieve stable reciprocating movement under the guidance of the guide rails or guide grooves on the upper end cover 13 and / or the lower end cover 14.

[0070] like Figure 5 and Fig. 9 As shown, the clamp 11 of this embodiment is formed with a connecting boss 111, the transmission member 15 is provided with a guide groove 151 extending perpendicularly to the first direction, the upper end cover 13 or the lower end cover 14 is formed with an exposure groove 134, and the connecting boss 111 passes through the exposure groove 134 and is limited in the guide groove 151. Due to the provision of the guide groove 151 extending perpendicularly to the first direction, the connecting boss 111 is pushed by the transmission member 15 in the first direction and the reverse force of the first direction during the movement process, and can reciprocate in the direction perpendicular to the first direction with the trend of narrowing or widening, so that no motion interference is generated.

[0071] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A drawing trolley cam operating device for drawing bars, characterized in that: The pulling carriage cam operating device comprises: Two drawing carriages, the drawing carriages are arranged in a straight line, wherein each of the drawing carriages comprises a mating portion; Two cam units, the cam units are arranged in a straight line and are rotatably arranged, each of the cam units includes a guide portion, each of the guide portions is respectively connected to a matching portion, the guide portion surrounds and is closed along the circumference of the cam unit, wherein in the circumference of the cam unit, the position of the guide portion in the axial direction of the cam unit is changed, and the drawing carriage is connected to a bar clamping device, and the bar clamping device includes: Two clamps, the clamps are used to clamp the rod, wherein the outer surfaces of the two clamps are inclined, and the outer surfaces of the two clamps are narrowed along a first direction, and the first direction is parallel to the arrangement direction of the drawing carriage; A base, wherein the base has a cavity inside for accommodating the clamp, the cavity has two outer constraint surfaces, the outer constraint surfaces are inclined surfaces that fit the outer surface of the clamp, and the two outer constraint surfaces are narrowed along a first direction; The inner part presses the two clamps against the outer constraint surface from the inside, the inner part has two inner constraint surfaces, the inner constraint surfaces are inclined surfaces, wherein the two inner constraint surfaces narrow along a first direction, the upper and lower sides of the clamp have an upper end cover and a lower end cover, at least one of the upper end cover and the lower end cover is provided with the inner part, a matching groove is formed between the inner constraint surface and the outer constraint surface, an inner matching boss is formed on the upper surface and / or the lower surface of the clamp, the inner matching boss is embedded in the matching groove and is relatively slidably arranged, wherein the The mating groove is arranged obliquely, and the distance between the two mating grooves narrows along the first direction, the upper end cover and the lower end of the base are fixedly connected, and the two sides of the base that are in contact with the inner mating boss are provided with outer mating bosses, and at least one of the upper end cover and the lower end cover is provided with an outer side portion, wherein the inner mating boss and the outer mating boss are clamped between the outer side portion and the inner side portion, and the distance between the inner surfaces of the outer side portions narrows along the first direction, and the distance between the outer side surfaces of the outer mating bosses narrows along the first direction; A power component drives the clamps to reciprocate between a first direction and the opposite direction of the first direction. The power component is connected to the two clamps through a transmission member, and drives the clamps to move along the first direction. An upper end cover is provided on the upper surface of the base or a lower end cover is provided on the lower surface of the base, and the transmission member is slidably provided on the upper end cover or the lower end cover.

2. The cam operating device of the drawing carriage according to claim 1, characterized in that: The two cam units are arranged to rotate synchronously, wherein in the circumferential direction of the cam unit, the axial distance between the two guide portions varies between a maximum distance and a minimum distance.

3. The cam operating device of the drawing carriage according to claim 2, characterized in that: Along the circumference of the cam unit, the axial distance between the two guide portions continuously increases from a minimum distance to a maximum distance, and continuously decreases from the maximum distance to a minimum distance.

4. The cam operating device of the drawing carriage according to claim 2, characterized in that: The cam units each include a rotating shaft, and the rotating shafts of the two cam units are connected via a connecting unit so that the two cam units rotate synchronously.

5. The cam operating device of the drawing carriage according to claim 4, characterized in that: A supporting unit is arranged between the cam units. The connecting unit is cylindrical in shape. The supporting unit has a circular hole. The connecting unit is accommodated in the circular hole of the supporting unit.

6. The cam operating device of the drawing carriage according to claim 1, characterized in that: The distance between the two guide surfaces of each guide portion in the axial direction is kept the same in the circumferential direction, wherein the matching portion is respectively in contact with the two guide surfaces from both sides.

7. The cam operating device of the drawing carriage according to claim 6, characterized in that: The matching portion includes two rollers, which are respectively fitted with the two guide surfaces from two sides and are arranged to roll along the guide surfaces.

8. The cam operating device of the drawing carriage according to claim 6, characterized in that: The two guide surfaces of each guide portion are both curved surfaces.

9. The cam operating device of the drawing carriage according to claim 1, characterized in that: The clamp is formed with a connecting boss, the transmission member is provided with a guide groove extending perpendicular to the first direction, the upper end cover or the lower end cover is formed with an exposure groove, the connecting boss passes through the exposure groove and is confined in the guide groove.

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