Front-through structure and movable mold unit

Abstract

This invention discloses a front-exit structure and moving mold unit, comprising: a bed, a main slide, a base plate, an exit slider, an exit rocker arm, an auxiliary spring, and a return spring. The main slide is horizontally slidably connected to the bed; the base plate is fixed to the bed and located above the main slide, with a cam strip at the bottom of the base plate; the exit slider is horizontally slidably connected to the main slide; the exit rocker arm is rotatably connected to the main slide, and the exit rocker arm has a T-shaped structure, with its front end extending to form an auxiliary section, its rear end extending to form a drive section that contacts and engages with the cam strip, and its bottom extending to form an ejection section that abuts against the exit slider; the auxiliary spring is located between the auxiliary section and the main slide; and the return spring is located between the drive section and the main slide. The front-exit structure and moving mold unit provided by this invention enable the main slide's retraction action and the exit rocker arm's ejection action to be synchronized, thereby achieving the ejection and demolding of workpieces of different lengths.

Description

Technical Field

[0001] This invention relates to the field of cold heading machine technology, and particularly to a front-exit structure and a moving mold unit. Background Technology

[0002] Cold heading machines, as key equipment in metal wire forming and processing, use cutting and cold extrusion processes to upset wire into standard parts or irregularly shaped workpieces such as automotive and motorcycle parts within a die. Their front-exit structure consists of a main connecting rod, a main slide, and a front-exit rocker arm. One end of the main connecting rod is hinged to the main slide, and the other end is linked to the drive crankshaft. When the crankshaft rotates, it drives the main slide to slide back and forth along the worktable, allowing the moving die and fixed die to complete the stamping action. After stamping, the main slide needs to push the workpiece out of the moving die through the front-exit rocker arm driven by the ejector pin during its return process. However, existing devices have complex structural designs, and the coordination between the main slide's return and the front-exit rocker arm's movement is insufficient. Because workpieces vary in length, the front-exit rocker arm cannot continuously push the workpiece forward while the main slide is retracting, causing the workpiece to remain in the moving die cavity due to ejection lag, directly affecting production efficiency and forming quality.

[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a front-exit structure and a moving mold unit, which aims to solve the technical problem of poor synchronization between the main slide retraction action and the exit rocker arm action in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A front-exit structure, including a bed, comprising:

[0007] The main slide is horizontally connected to the bed.

[0008] The base plate is fixed on the bed and located above the main slide, and a cam strip is provided at the bottom of the base plate;

[0009] The slider extends out and slides horizontally with the main slide table.

[0010] The through rocker arm is rotatably connected to the main slide. The through rocker arm has a T-shaped structure, with its front end extending to form an auxiliary section, its rear end extending to form a drive section that contacts and cooperates with the cam strip, and its bottom extending to form an ejection section that abuts against the through slider.

[0011] An auxiliary spring is located between the auxiliary section and the main slide.

[0012] The return spring is located between the drive section and the main slide.

[0013] When the main slide moves backward, the drive section moves along the cam bar trajectory, causing the through rocker arm to swing downward around its rotation center with respect to the main slide. This pushes the through slider forward through the ejector section. The auxiliary spring applies an auxiliary thrust to the auxiliary section, driving the through rocker arm to continue swinging downward, and the ejector section continues to push the through slider forward. When the main slide moves forward, the return spring applies a return thrust to the drive section, causing the through rocker arm to swing in the opposite direction around its rotation center with respect to the main slide. The drive section remains in contact with the cam bar.

[0014] Furthermore, a roller is rotatably connected to the end of the drive section, and the cam bar includes an outgoing arc surface and a reset plane; when the main slide moves backward, the roller slides from the outgoing arc surface to the reset plane, driving the outgoing rocker arm to swing downward.

[0015] Furthermore, the drive section is provided with two parallel first legs, and the roller is located between the ends of the two first legs; a first adjusting screw is screwed onto each first leg, and a first mounting cavity corresponding to the position of the first adjusting screw is provided on the main slide, and the return spring is embedded in the first mounting cavity, with its upper end abutting against the end of the first adjusting screw.

[0016] Furthermore, the substrate is provided with an adjustment groove extending along the moving direction of the main slide, and the cam bar is slidably connected to the adjustment groove; an adjustment screw is rotatably connected to the substrate, and the adjustment screw is screwed to the end of the cam bar; a number of set screws are provided on the substrate, and the set screws lock the cam bar on the substrate.

[0017] Furthermore, a second adjusting screw is screwed onto the auxiliary section; a second mounting cavity corresponding to the position of the second adjusting screw is provided on the main slide, and an auxiliary spring is embedded in the second mounting cavity, with its upper end abutting against the end of the second adjusting screw.

[0018] Furthermore, the end of the ejector section facing the exit slider is provided with a hemispherical protrusion; the exit slider extends in a vertical direction, and the sidewall of the exit slider forms a point contact fit with the protrusion.

[0019] Furthermore, the ejector section is provided with two parallel second legs, each second leg being provided with a protrusion, and a protrusion abutting against an ejector slider.

[0020] A dynamic model unit, comprising:

[0021] The main crankshaft is used for connecting to external power sources.

[0022] The first connecting rod is rotatably connected at its lower end to the eccentric journal of the main crankshaft;

[0023] The second link has its middle part rotatably connected to the bed, and one end of it rotatably connected to the upper end of the first link;

[0024] Third link;

[0025] The structure has a front-opening section, and a support shaft is provided on the main slide. One end of the third link is rotatably connected to the support shaft, and the other end is rotatably connected to the upper end of the first link. The third link is used to drive the main slide to move.

[0026] Beneficial effects:

[0027] This invention provides a front-exit structure and a moving mold unit. When the main slide retracts, the cam bar triggers the exit rocker arm to swing downwards, pushing the exit slider forward. Simultaneously, the exit rocker arm continues to swing downwards under the auxiliary thrust of the auxiliary spring to compensate for the cam bar's inability to precisely control the swing process of the exit rocker arm, ensuring the exit slider continues to move forward. This makes the main slide retraction action and the exit rocker arm ejection action synchronized, enabling the ejection and demolding of workpieces of different lengths. When the main slide moves forward for stamping, the exit rocker arm swings upwards and remains in contact with the cam bar under the return thrust of the return spring, providing a precise triggering reference for the ejection action of the next working cycle. Attached Figure Description

[0028] Figure 1 The structure of the front outlet structure provided by the present invention Figure 1 ;

[0029] Figure 2 The structure of the front outlet structure provided by the present invention Figure 2 ;

[0030] Figure 3 Exploded view of the front-exit structure provided by the present invention;

[0031] Figure 4 Main sectional view of the front-exit structure provided by the present invention Figure 1 ;

[0032] Figure 5 Main sectional view of the front-exit structure provided by the present invention Figure 2 .

[0033] Reference numerals: Bed 1, Base plate 11, Adjustment groove 111, Long groove 112, Adjustment screw 12, Set screw 13, Main slide 2, First mounting cavity 21, Second mounting cavity 22, Support shaft 23, Cam bar 3, Through arc surface 31, Reset plane 32, Through slider 4, Through rocker arm 5, Auxiliary section 51, Second adjusting screw 511, Drive section 52, Roller 521, First support leg 522, First adjusting screw 5221, Ejector section 53, Protrusion 531, Second support leg 532, Auxiliary spring 6, Return spring 7, Main crankshaft 8, First connecting rod 81, Second connecting rod 82, Third connecting rod 83; Moving mold base 9, Moving mold 91, Ejector pin 92. Detailed Implementation

[0034] This invention provides a front-exit structure and a moving-mode unit. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0035] In the description of this invention, it should be understood that the terms "upper," "lower," "front," and "rear," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0036] In this invention, "front" refers to the direction in which the moving mold moves towards the fixed mold, and "rear" is the opposite direction to "front".

[0037] Please see Figures 1 to 5 As shown, the present invention provides a front-exit structure, including a bed 1, a main slide 2, a base plate 11, an exit slider 4, an exit rocker arm 5, an auxiliary spring 6, and a return spring 7; the main slide 2 is horizontally slidably connected to the bed 1; the base plate 11 is fixed on the bed 1 and located above the main slide 2, and a cam strip 3 is provided at the bottom of the base plate 11; the exit slider 4 is horizontally slidably connected to the main slide 2; the exit rocker arm 5 is rotatably connected to the main slide 2, and the exit rocker arm 5 has a T-shaped structure, with its front end extending to form an auxiliary section 51, its rear end extending to form a drive section 52 that contacts and cooperates with the cam strip 3, and its bottom extending to form an ejection section 53 that abuts against the exit slider 4; the auxiliary spring 6 is disposed between the auxiliary section 51 and the main slide 2; and the return spring 7 is disposed between the drive section 52 and the main slide 2.

[0038] When the main slide 2 moves backward, the drive section 52 moves along the trajectory of the cam bar 3, causing the through rocker arm 5 to swing downward around its rotation center with the main slide 2. The through section 53 pushes the through slider 4 forward. The auxiliary spring 6 applies an auxiliary thrust to the auxiliary section 51, driving the through rocker arm 5 to swing downward continuously. The through section 53 continues to push the through slider 4 forward. When the main slide 2 moves forward, the return spring 7 applies a return thrust to the drive section 52, causing the through rocker arm 5 to swing in the opposite direction around its rotation center with the main slide 2. The drive section 52 remains in contact with the cam bar 3.

[0039] After the stamping action is completed, the workpiece is embedded in the moving mold 91 at the front end of the main slide table 2 under the action of the stamping force. When the main slide table 2 is driven to move backward, the drive section 52 triggers the through rocker arm 5 to swing downward around the rotation center under the limit of the cam bar 3, which drives the ejection section 53 to push the through slider 4 forward to realize the initial ejection action. Since the cam bar 3 cannot precisely control the swing process of the through rocker arm 5, the through rocker arm 5 cannot completely eject workpieces of different lengths from the moving mold 91. Therefore, at the moment of the top of the through rocker arm 5, the auxiliary spring 6 continuously applies an upward auxiliary thrust to the auxiliary section 51 to help the through rocker arm 5 to continue to swing downward in time to connect with the initial ejection action, so as to ensure that the ejection section 53 continues to push the through slider 4 forward during the retraction of the main slide table 2. Through the rigid constraint of the cam bar 3 and the adaptive compensation of the auxiliary spring 6, the forward movement is ensured at the moment the workpiece is triggered to be ejected, ensuring the synchronization of the retraction action of the main slide 2 and the ejection action of the through rocker arm 5, and realizing the function of completely ejecting workpieces of different lengths from the moving mold 91.

[0040] During the stamping stage, the main slide 2 is driven to move forward, and the through slide 4 is moved backward by the reverse force of the workpiece entering the moving mold 91, which forces the ejector section 53 to drive the through rocker arm 5 to swing upward. At this time, the return spring 7 applies an upward return thrust to the drive section 52, so that the position of the drive section 52 is in contact with the cam bar 3, providing a precise triggering reference for the ejection action of the next working cycle.

[0041] In a preferred embodiment, see [reference] Figure 3 , 5 The end of the drive section 52 is rotatably connected to a roller 521. The cam bar 3 includes an outgoing arc surface 31 and a reset plane 32. By moving the roller 521 along the outgoing arc surface 31 and the reset plane 32, the friction between the drive section 52 and the cam bar 3 is reduced, ensuring that the drive section 52 can move in a timely manner without jamming. When the main slide 2 moves backward, the roller 521 slides from the exit arc surface 31 to the reset plane 32, driving the exit rocker arm 5 to swing downward. The curvature change of the exit arc surface 31 forces the drive section 52 to press down, driving the exit rocker arm 5 to swing downward around the rotation center. After the roller 521 slides out of the exit arc surface 31, the auxiliary spring 6 applies a continuous auxiliary thrust to the auxiliary section 51 of the exit rocker arm 5, and the exit rocker arm 5 continues to swing downward, so that the ejection section 53 maintains the forward push stroke of the exit slider 4, ensuring that the workpiece is not restricted by the trajectory of the cam strip 3 during the ejection process. When the main slide 2 moves forward, the exit slider 4 moves backward due to the reaction force of the workpiece entering the mold, driving the exit rocker arm 5 to swing upward around the rotation center. Combined with the return thrust of the return spring 7 on the drive section 52, the roller 521 on the drive section 52 slides along the reset plane 32 to the exit arc surface 31 and maintains a contact state to avoid the inability to generate the next ejection action in time.

[0042] Further, see Figure 3 ,4 The drive section 52 has two parallel first legs 522, and the roller 521 is located between the ends of the two first legs 522. A first adjusting screw 5221 is screwed onto each first leg 522. The main slide 2 has a first mounting cavity 21 corresponding to the position of the first adjusting screw 5221. The return spring 7 is embedded in the first mounting cavity 21, and its upper end abuts against the end of the first adjusting screw 5221 to apply an upward return thrust to the drive section 52. Through the symmetrical distribution of the two first legs 522 and the geometric constraint of the first mounting cavity 21, the stability and force balance of the return spring 7 are ensured, effectively preventing the return spring 7 from deflecting or twisting during reciprocating motion, and keeping the roller 521 on the drive section 52 in contact with the cam bar 3.

[0043] In the above, by turning the first adjusting screw 5221, the depth of the first adjusting screw 5221 screwed into the first support 522 can be controlled, thereby changing the compression of the return spring 7, and thus precisely adjusting the magnitude of the return thrust received by the drive section 52.

[0044] In a preferred embodiment, see [reference] Figure 5 The base plate 11 is provided with an adjustment groove 111 extending along the moving direction of the main slide 2. The cam strip 3 is slidably connected to the adjustment groove 111. An adjustment screw 12 is rotatably connected to the base plate 11, and the adjustment screw 12 is screwed to the end of the cam strip 3. By rotating the adjustment screw 12 to change its screw-in amount, the cam strip 3 can be driven to move along the adjustment groove 111, thereby adjusting the horizontal position of the through arc surface 31 relative to the main slide 2, and accurately controlling the triggering timing of the through rocker arm 5 pushing out when the main slide 2 retracts. The base plate 11 is provided with a plurality of set screws 13, which lock the cam strip 3 on the base plate 11. Specifically, the top of the base plate 11 is provided with a long groove 112 parallel to the adjustment groove 111. The set screw 13 is slidably connected to the long groove 112. After the position of the cam strip 3 is adjusted, the set screw 13 is tightened to fix the cam strip 3 in the adjustment groove 111.

[0045] In a preferred embodiment, see [reference] Figure 3 , 5 The auxiliary section 51 is screwed with a second adjusting screw 511; the main slide 2 is provided with a second mounting cavity 22 corresponding to the position of the second adjusting screw 511, and the auxiliary spring 6 is embedded in the second mounting cavity 22, with its upper end abutting against the end of the second adjusting screw 511. By setting the second mounting cavity 22, the auxiliary spring 6 can be stably installed; by turning the second adjusting screw 511, the compression of the auxiliary spring 6 can be changed, thereby precisely adjusting the magnitude of the auxiliary thrust on the auxiliary section 51, ensuring that at the moment when the drive section 52 is constrained by the cam bar 3 and drives the through rocker arm 5 to swing downward, the auxiliary thrust applied by the auxiliary spring 6 can continue to drive the through rocker arm 5 to swing downward, ensuring that the ejector section 53 continues to push the through slider 4 forward.

[0046] In a preferred embodiment, see [reference] Figure 4 The ejector section 53 has a hemispherical protrusion 531 at one end facing the exit slider 4. The exit slider 4 extends vertically, and its sidewall forms a point contact with the protrusion 531. During ejection, the hemispherical protrusion 531 rolls against the sidewall of the exit slider 4, reducing sliding friction and pushing the exit slider 4, which has a certain height, forward. For the requirement of a two-stroke process (one workpiece needs to be stamped twice at one station), the front end of the main slide 2 is provided with a moving mold base 9. Two moving molds 91 are arranged side-by-side vertically on the moving mold base 9. Each moving mold 91 has an independent ejector pin 92. When the exit rocker arm 5 pushes the exit slider 4 forward, the exit slider 4 drives the ejector pin 92 forward to eject the workpiece from the corresponding moving mold 91. On the vertical projection plane, both ejector pins 92 are located within the projection range of the through-slider 4. When the through-slider 4 is driven forward by the ejector section 53, the through-slider 4 acts synchronously on the ends of the two ejector pins 92, ensuring that the workpiece located in any moving mold 91 is ejected and demolded. The integrated structure of single slider driving double ejector pins 92 significantly reduces the number of parts in the front through-slider structure and reduces the overall structural complexity.

[0047] Further, see Figure 3 , 4 The ejector section 53 is provided with two parallel second legs 532, each second leg 532 is provided with a protrusion 531, and one protrusion 531 abuts against one through-slider 4. One through-slider 4 ejects the workpiece in one moving mold base 9. For the two-die four-punch process requirement, that is, the workpiece needs to be formed by two punches at two stations, two moving mold bases 9 are arranged side by side in the horizontal direction at the front end of the main slide table 2. Each moving mold base 9 is provided with two vertically arranged moving dies 91, and each moving die 91 is independently provided with an ejector pin 92. When the through-slider arm 5 is driven to swing down, the two second legs 532 of the ejector section 53 synchronously push the two through-slider 4 forward. The through-slider 4 drives the corresponding ejector pin 92 to perform the ejection action, realizing the synchronous demolding of the workpiece in two stations. It can meet the requirements of multi-station stamping process while avoiding the addition of additional drive structure, effectively simplifying the structural complexity.

[0048] In summary, when the main slide 2 retracts, the drive section 52 of the through-hole rocker arm 5 is triggered by the limiting action of the cam bar 3 to swing downwards, driving the ejection section 53 to push the through-hole slider 4 forward, performing the initial ejection action. At this time, the auxiliary section 51 continues to swing downwards under the auxiliary thrust of the auxiliary spring 6, compensating for the inability of the cam bar 3 to precisely control the swing process of the through-hole rocker arm 5. This ensures that the ejection section 53 maintains a forward pushing action during the full stroke retraction of the main slide 2, and the retraction action of the main slide 2 and the ejection action of the through-hole rocker arm 5 are synchronized, ensuring complete demolding of workpieces of different lengths. When the main slide 2 moves forward for stamping, the through-hole slider 4 moves backwards under the reaction force of the workpiece entering the mold, driving the through-hole rocker arm 5 to swing upwards. The drive section 52 is pushed back by the return spring 7, keeping the roller 521 in contact with the cam bar 3. The cam bar 3 achieves fine adjustment of its lateral position through the adjusting groove 111 and the adjusting screw 12, precisely controlling the ejection trigger timing. Furthermore, the hemispherical protrusion 531 at the end of the ejector section 53 makes point contact with the side wall of the through slider 4 to reduce friction. Especially for the two-mold four-punch process, the ejector section 53 is equipped with two second support legs 532 to push the through slider 4 synchronously. Moreover, the projection of each through slider 4 covers the position of the double ejector pins 92 on the same vertical plane, realizing synchronous demolding of two stations and significantly simplifying the overall structure.

[0049] See Figure 1 , 2 5. The present invention also provides a moving model unit, including a main crankshaft 8, a first connecting rod 81, a second connecting rod 82, a third connecting rod 83, and the aforementioned front-through structure; the main crankshaft 8 is used for transmission connection to an external power source; the lower end of the first connecting rod 81 is rotatably connected to the eccentric journal of the main crankshaft 8; the middle part of the second connecting rod 82 is rotatably connected to the bed 1, and one end of the second connecting rod 82 is rotatably connected to the upper end of the first connecting rod 81; a support shaft 23 is provided on the main slide 2; one end of the third connecting rod 83 is rotatably connected to the support shaft 23, and the other end of the third connecting rod 83 is rotatably connected to the upper end of the first connecting rod 81, and the third connecting rod 83 is used to drive the main slide 2 to move. An external power source drives the main crankshaft 8 to rotate, the first connecting rod 81 rotates around the rotation center of the main crankshaft 8, thereby driving the second connecting rod 82 to rotate around its rotation center with the bed 1, and driving the third connecting rod 83 to drive the main slide 2 to reciprocate. When the main slide 2 retracts, the cam bar 3 triggers the exit rocker arm 5 to swing downwards, pushing the exit slider 4 forward. At this time, the exit rocker arm 5 continues to swing downwards under the auxiliary thrust of the auxiliary spring 6, ensuring that the exit slider 4 continues to move forward. The retraction action of the main slide 2 and the ejection action of the exit rocker arm 5 are synchronized, realizing the ejection of workpieces of different lengths from the moving mold 91. When the main slide 2 moves forward to stamp, the exit slider 4 moves backwards under the reaction force of the workpiece stamping, driving the exit rocker arm 5 to swing upwards. At this time, the exit rocker arm 5 remains in contact with the cam bar 3 under the return thrust of the return spring 7, providing a precise triggering reference for the ejection action of the next working cycle.

[0050] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A front-exit structure, comprising a bed (1), characterized in that, include: The main slide (2) is horizontally slidably connected to the bed (1); The base plate (11) is fixed on the bed (1) and located above the main slide (2). The bottom of the base plate (11) is provided with a cam strip (3). The through slider (4) is horizontally slidably connected to the main slide (2); The through rocker arm (5) is rotatably connected to the main slide (2). The through rocker arm (5) has a T-shaped structure. Its front end extends to form an auxiliary section (51), its rear end extends to form a drive section (52) that contacts and cooperates with the cam strip (3), and its bottom extends to form an ejection section (53) that abuts against the through slider (4). An auxiliary spring (6) is located between the auxiliary section (51) and the main slide (2); A return spring (7) is provided between the drive section (52) and the main slide (2); When the main slide (2) moves backward, the drive section (52) moves along the trajectory of the cam bar (3), causing the through rocker arm (5) to swing downward around its rotation center with the main slide (2), and pushes the through slider (4) forward through the ejector section (53). The auxiliary spring (6) applies an auxiliary thrust to the auxiliary section (51), driving the through rocker arm (5) to swing downward continuously, and the ejector section (53) to push the through slider (4) forward continuously. When the main slide (2) moves forward, the return spring (7) applies a return thrust to the drive section (52), causing the through rocker arm (5) to swing in the opposite direction around its rotation center with the main slide (2), and the drive section (52) maintains contact with the cam bar (3). The end of the drive section (52) is rotatably connected to a roller (521), and the cam bar (3) includes an outgoing arc surface (31) and a reset plane (32); when the main slide (2) moves backward, the roller (521) slides from the outgoing arc surface (31) to the reset plane (32), driving the outgoing rocker arm (5) to swing downward; The drive section (52) is provided with two parallel first legs (522), and the roller (521) is located between the ends of the two first legs (522); a first adjusting screw (5221) is screwed onto each first leg (522), and a first mounting cavity (21) corresponding to the position of the first adjusting screw (5221) is provided on the main slide (2). The return spring (7) is embedded in the first mounting cavity (21), and its upper end abuts against the end of the first adjusting screw (5221). The auxiliary section (51) is screwed with a second adjusting screw (511); the main slide (2) is provided with a second mounting cavity (22) corresponding to the position of the second adjusting screw (511), the auxiliary spring (6) is embedded in the second mounting cavity (22), and its upper end abuts against the end of the second adjusting screw (511); The ejector section (53) has a hemispherical protrusion (531) at one end facing the through slider (4); the through slider (4) extends vertically, and the side wall of the through slider (4) forms a point contact fit with the protrusion (531); The ejector section (53) is provided with two parallel second legs (532), each second leg (532) is provided with a protrusion (531), and a protrusion (531) abuts against an ejector slider (4).

2. The front-exit structure according to claim 1, characterized in that, The base plate (11) is provided with an adjustment groove (111) extending along the moving direction of the main slide (2), and the cam strip (3) is slidably connected to the adjustment groove (111); an adjustment screw (12) is rotatably connected to the base plate (11), and the adjustment screw (12) is screwed to the end of the cam strip (3); a number of set screws (13) are provided on the base plate (11), and the set screws (13) lock the cam strip (3) on the base plate (11).

3. A moving model unit, characterized in that, include: The main crankshaft (8) is used for external power source transmission connection; The lower end of the first connecting rod (81) is rotatably connected to the eccentric journal of the main crankshaft (8); The second link (82) is rotatably connected to the bed (1) at its middle part and rotatably connected to the upper end of the first link (81) at one end. Third link (83); According to any one of claims 1-2, the main slide (2) is provided with a support shaft (23); one end of the third link (83) is rotatably connected to the support shaft (23), and the other end is rotatably connected to the upper end of the first link (81). The third link (83) is used to push the main slide (2) to move.

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