CN108995106B

CN108995106B - A molding device for circular automobile ornaments

Info

Publication number: CN108995106B
Application number: CN201810837594.XA
Authority: CN
Inventors: 陈兵兵
Original assignee: Wuhu Wenqing Machinery Equipment Design Co ltd
Current assignee: Anhui Dateng Automobile Service Co ltd
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2021-02-09
Anticipated expiration: 2038-07-26
Also published as: CN108995106A

Abstract

The invention discloses a mould pressing device for a round automobile ornament, which also comprises a grinding mechanism and a transmission mechanism, the grinding mechanism comprises a small-sized grinding machine, a rotating motor arranged below a top plate of the machine table, a grinding machine support and a support turnover mechanism, the top of the machine table is provided with a mill through groove consistent with the moving path of the small mill, the output shaft of the rotating motor is positioned at the center of the lower die, the mill bracket is in L-shaped and is rotationally connected with the output shaft, and comprises a horizontal section as a shaft and an erectable section of which the end part is provided with the small mill, the support turnover mechanism comprises a supporting seat fixed in the machine table, a cam and a turnover frame, wherein the cam and the turnover frame are installed on the supporting seat, a rotating shaft of the turnover frame and a rotating shaft of the cam are horizontally arranged and are in transmission connection with each other, and the turnover frame is provided with a horizontal deflector rod which horizontally extends out to stir the mill support. According to the invention, the step of polishing the trim part edge specially is reduced after molding, the time for feeding and discharging is saved, and the processing efficiency is improved.

Description

A molding device for circular automobile ornaments

Technical Field

The invention relates to the field of automotive interior parts, in particular to a die pressing device for a circular automotive trim part.

Background

At present, part of interior trim parts in the automotive interior trim parts are manufactured by adopting a die pressing method, and the edges of the interior trim parts subjected to punch forming can generate flanges and burrs, so that the next procedure is carried out only by polishing. Manual sanding or special sanding machines are conventionally used. The former has low speed and low efficiency, and the latter needs special grinding equipment to increase the cost and needs time for loading and unloading. The prior art may therefore be further developed to overcome the above problems.

Disclosure of Invention

The invention aims to provide a die pressing device for a round automobile ornament, and the die pressing device is used for solving the defects that in the prior art, the polishing of flanging and burrs on the edge of an interior ornament after die pressing is carried out is time-consuming, the feeding and discharging of special polishing equipment are time-consuming, and the cost is higher.

A mould pressing device for circular automobile ornaments, include the board, fix lower mould and punching press mechanism on the board, the mould is installed to punching press mechanism's telescopic link tip, the lower mould is circular, its characterized in that: the grinding machine comprises a machine table, a grinding mechanism and a transmission mechanism, wherein the grinding mechanism comprises a small-sized grinding machine, a rotating motor arranged below a top plate of the machine table, a grinding machine support and a support turnover mechanism, the top of the machine table is provided with a grinding machine through groove consistent with the moving path of the small-sized grinding machine, the output shaft of the rotating motor is positioned at the center of a lower die, the grinding machine support is in an L shape and is rotationally connected with the output shaft, the grinding machine support comprises a horizontal section and an end part which are used as shafts, the vertical section of the small-sized grinding machine is arranged above the periphery of the lower die, a grinding head of the small-sized grinding machine is positioned above the periphery of the lower die, the support turnover mechanism comprises a supporting seat fixed in the machine table, a cam and a turnover frame which are arranged on the supporting seat, a, the grinding machine support and the rotating shaft of the roll-over stand are respectively sleeved with a first reset torsion spring and a second reset torsion spring, in a grinding state, the upright section is upright, the height of the horizontal section is higher than that of all horizontal deflector rods, and the cam is connected with the telescopic rod through a transmission mechanism.

Preferably, the output shaft is vertically and fixedly provided with a support sleeve, the horizontal section is inserted into the support sleeve and is rotationally connected with the support sleeve, one end of the reset torsion spring is connected with the upright section, the other end of the reset torsion spring is connected with the inner side of the support sleeve, the end part of the support sleeve is provided with a side arc surface opening for the upright section to stretch out, the width of the side arc surface opening is matched with the diameter of the upright section, and the angle and the position of the arc surface of the side arc surface opening are matched with the rotation angle and the position of the upright section.

Preferably, a pre-compression mechanism is arranged in the upper die and comprises a nitrogen spring arranged at the center of the upper die, the lower end of the nitrogen spring is pressed on the interior trim part in the polishing state, and the lower end of the nitrogen spring is not in contact with the interior trim part in the initial state.

Preferably, a contact sensor is installed at a position where the upright section can contact the upper side edge of the opening of the side arc surface, a corner sensor for sensing the corner of the rotating shaft is arranged in the rotating motor, the contact sensor is respectively in signal connection with the rotating motor, a mill motor of the small mill and a stamping control switch of the stamping mechanism, and the corner sensor is respectively in signal connection with the mill motor and the stamping control switch.

Preferably, the mill through groove comprises a linear through groove for the small mill to pass through when the mill support is turned over and an annular through groove consistent with the path of the small mill in the grinding stage, and the linear through groove is communicated with the annular through groove at the joint.

Preferably, the roll-over stand comprises radial connecting plates which are circumferentially connected to a rotating shaft of the roll-over stand at equal angles and horizontal shift rods which are vertically fixed at the end parts of the radial connecting plates, and the number of the radial connecting plates and the number of the horizontal shift rods are respectively 3.

Preferably, the turning angle range of the roll-over stand is 60 degrees to 140 degrees from the punching state to the grinding state, and the turning angle range of the cam is less than 90 degrees.

Preferably, the transmission mechanism comprises a sliding pressure plate structure in contact transmission with the cam profile, a vertical guide rail arranged on the machine table and a follow-up block fixed on the telescopic rod, the follow-up block is fixedly connected with the sliding pressure plate structure, the sliding pressure plate structure is in sliding fit with the vertical guide rail,

preferably, the sliding pressure plate structure comprises a sliding block connected in the vertical guide rail in a sliding mode and a pressure plate fixedly connected to the bottom of the sliding block through a vertical connecting rod, the pressure plate is in contact transmission with the cam, and the sliding block is fixedly connected with the follow-up block.

The invention has the advantages that: the inner side of an upper die of the die is matched with the outer side of a lower die, and the outer edge of the circular interior trim part after compression molding is provided with a flanging and a burr. After resetting, the height of all horizontal deflector rods is lower than that of the mill support, the horizontal deflector rods are not in contact with the vertical section of the mill support any more, and the vertical section can reach a vertical state under the action of the reset torsion spring. At the moment, the contact inductor on the section capable of being erected starts the small mill and the rotating motor at the end part of the section capable of being erected, and the small mill grinds the edge of the interior trimming part and rotates along with the driving of the rotating motor. The small-sized grinding machine finishes the grinding work of the edge of the interior trim part after rotating for one circle, the corner sensor sends a signal to the mould pressing device to return to the initial state, and an operator feeds the ground interior trim part. Therefore, the edge of the interior trim part is automatically polished after the die pressing is finished, the steps of polishing the edge of the interior trim part specially are reduced, the feeding and discharging time is saved, and the processing efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of a main view of the present invention;

FIG. 2 is a schematic side view of the internal structure of the drive mechanism and the grinding mechanism of the present invention;

FIG. 3 is a schematic view of the structure of the mill stand and roll-over stand at the beginning of the grinding stage according to the present invention;

FIG. 4 is a schematic view of the structure of the mill stand and roll-over stand at the beginning of the stamping stage according to the present invention;

FIG. 5 is a schematic view of a machine table in a top view according to the present invention;

FIG. 6 is a signal connection diagram of the modules of the control structure of the present invention;

fig. 7 is a schematic structural view of the cam in the present invention.

1. The machine table, 11, a supporting plate, 12, a mill through groove, 13, a stamping control switch, 2, a stamping mechanism, 21, a stamping cylinder, 22, a stamping guide pillar, 23, a stamping guide sleeve, 3, a transmission mechanism, 31, a vertical guide rail, 32, a follow-up block, 33, a sliding block, 34, a vertical connecting rod, 35, a pressing plate, 4, an upper die, 41, a nitrogen spring, 5, a lower die, 6, a grinding mechanism, 61, a small-sized mill, 611, a mill motor, 62, a rotating motor, 63, a support sleeve, 631, a side cambered surface opening, 64, a turning frame, 641, a radial connecting plate, 642, a horizontal deflector rod, 65, a cam, 66, a supporting seat, 67 and a mill support.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.

As shown in fig. 1-7, the present invention provides a molding device for a circular automobile trim, which includes a machine table 1, a lower mold 5 fixed on the machine table 1, and a stamping mechanism 2. A pair of supporting plates 11 is fixed on the machine table 1, and a supporting bottom plate is fixed at the upper ends of the supporting plates 11. The supporting plates 11 are fixed at two ends of the bottom of the supporting base plate, a stamping cylinder 21 is fixed in the middle of the supporting base plate, and the stamping cylinder 21 can be a hydraulic cylinder or an air cylinder. The telescopic rod of the stamping cylinder 21 passes through the support floor. The support base plate is further provided with stamping guide sleeves 23 symmetrically arranged on two sides of the stamping cylinder 21, stamping guide pillars 22 are slidably sleeved in the stamping guide sleeves 23, the lower ends of the stamping guide pillars 22 penetrate through the support base plate and are fixed on an upper die 4 seat together with the lower end of the telescopic rod, and an upper die 4 is fixedly arranged at the bottom of the upper die 4 seat and is opposite to the lower die 5. The lower die 5 is circular, and the outer edge of the lower die is matched with the inner side edge of the bottom of the upper die 4.

The die pressing device also comprises a grinding mechanism 6 which comprises a small-sized grinder 61, a rotating motor 62 arranged below the top plate of the machine table 1, a grinder support 67 and a support turnover mechanism. An output shaft of the rotating motor 62 is positioned at the center of the lower die 5, and a bracket sleeve 63 is vertically and fixedly installed on the output shaft. The mill holder 67 has an L-shape including a horizontal section as a shaft and an erectable section having the small mill 61 mounted at an end thereof. The horizontal section is inserted into the support sleeve 63 and is rotationally connected with the support sleeve 63, a first reset torsion spring is sleeved on the horizontal section, one end of the first reset torsion spring is connected to the upright section, and the other end of the first reset torsion spring is connected to the inner side of the support sleeve 63. The end of the bracket sleeve 63 is provided with a side arc opening 631 for the upright section to extend out, the width of the side arc opening 631 is matched with the diameter of the upright section, and the arc angle and position of the side arc opening 631 are matched with the rotation angle and position of the upright section. The top of the machine table 1 is provided with a mill through groove 12 consistent with the moving path of the small mill 61, so that when the mill support 67 rotates by taking a horizontal section as an axis, the erectable section can be erected, and the side edge of the side arc surface opening 631 is used for limiting, so that the erectable section can be erected during grinding; when punching is needed, the small-sized grinding machine 61 is to be put into the machine table 1, the grinding machine support 67 rotates to enable the vertical section to enter the machine table 1, the horizontal state is best, and the side edge of the side arc surface opening 631 can be used for limiting.

When the erectable section is erected, the grinding heads of the small-sized grinding machine 61 are positioned on the periphery of the lower die 5. The mill through groove 12 comprises a straight through groove for the small mill 61 to pass through when the mill support 67 is turned over and an annular through groove which is consistent with the path of the small mill 61 in the grinding stage, and the straight through groove is communicated with the annular through groove at the connection position. The rotation motor 62 has a rotation angle sensor built therein and can control its rotation angle and rotation number. When the operator faces the mold, if the small-sized grinder 61 is turned out from the left side, the rotating motor 62 rotates counterclockwise, and the grinding head rotates clockwise; otherwise, the rotating motor 62 rotates clockwise, and the grinding head rotates anticlockwise. This prevents grinding resistance from rotating the mill bracket 67.

The support turnover mechanism comprises a support seat 66 fixed in the machine table 1, a cam 65 installed on the support seat 66 and a turnover frame 64. The rotating shaft of the roll-over stand 64 and the rotating shaft of the cam 65 are horizontally arranged and are in transmission connection with each other. The roll-over stand 64 comprises radial connecting plates 641 which are circumferentially connected to the rotating shaft of the roll-over stand 64 at equal angles, and 3 horizontal shift rods 642 vertically fixed at the ends of the radial connecting plates 641. From the punching state to the grinding state, the rotation angle range of the roll-over stand 64 is 60 degrees to 140 degrees, and the rotation angle range of the cam 65 is less than 90 degrees. If the rotation angle of the roll-over stand 64 is equal to the rotation angle range of the cam 65, the rotation shaft of the roll-over stand 64 and the rotation shaft of the cam 65 may be directly connected without a gear mechanism. The angle of rotation of the roll-over stand 64 is calculated from the angle of rotation of the mill bracket 67 and the distance of the horizontal deflector rod 642 to the horizontal section when the horizontal deflector rod 642 is in contact with the mill bracket 67. The rotation angle of the cam 65 is determined by the shape and size of the cam 65 and the height difference between the two states of the pressing plate 35 driving the cam to move.

The mould pressing device also comprises a transmission mechanism 3, which comprises a sliding pressure plate 35 structure in contact transmission with the profile of the cam 65, a vertical guide rail 31 arranged on the machine table 1 and a follow-up block 32 fixed on the telescopic rod. The structure of the sliding pressure plate 35 is in sliding fit with the vertical guide rail 31, the structure of the sliding pressure plate 35 comprises a sliding block 33 which is in sliding connection with the vertical guide rail 31 and a pressure plate 35 which is fixedly connected with the bottom of the sliding block 33 through a vertical connecting rod 34, the pressure plate 35 is in contact transmission with the cam 65, and the sliding block 33 is fixedly connected with the follow-up block 32. And a second reset torsion spring is sleeved on the rotating shaft of the turning frame 64, and in a grinding state, the vertical section is vertical and the height of the horizontal section is higher than that of all the horizontal deflector rods 642. Therefore, when the transmission mechanism 3 is not pressed down any more, the cam 65 and the roll-over stand 64 can rotate due to the torsion of the second reset torsion spring, and when the grinding state before the grinding machine bracket 67 is overturned is returned, the erectable segment is erected and the height of the horizontal segment is higher than that of all the horizontal shift rods 642, so that the grinding machine bracket 67 cannot be interfered by the roll-over stand 64 during rotation.

And a pre-pressing mechanism is arranged in the upper die 4, and the pre-pressing mechanism is a nitrogen spring 41 arranged at the center of the upper die 4. In the polishing state, the lower end of the nitrogen spring 41 is pressed on the interior trim part, and in the initial state, the lower end of the nitrogen spring 41 is not in contact with the interior trim part.

The molding apparatus further includes a contact sensor, a rotation angle sensor, and a press control switch 13 for controlling the press cylinder 21. The erectable segment is provided with a contact inductor at a position capable of contacting the upper side of the side arc surface opening 631, and the rotating motor 62 is provided with a corner inductor for inducing the rotation angle of the rotating shaft. The contact sensors are signal-connected to the rotary motor 62, the mill motor 611 of the small size mill 61, and the press control switch 13 of the press mechanism 2, respectively. The rotation angle sensor is respectively connected to the grinder motor 611 and the press control switch 13.

The working process of the invention is as follows: the working process can be divided into an initial state, a stamping state, a first lifting state, a polishing state and a second lifting state. In the initial state, the telescopic rod is located at the initial high position of the punching cylinder 21, the pressing plate 35 is not in contact with the cam 65, the roll-over stand 64 is in the initial state similar to the situation shown in fig. 3, and the height of the horizontal section of the mill support 67 is higher than that of all the horizontal deflector rods 642.

After the material is fed to the lower die 5, the press molding is started, and the press state is started, the press plate 35 is lowered simultaneously with the follower block 32, and is driven to rotate by contacting the contour of the cam 65. In one embodiment, the rotational angles of the roll stand 64 and the cam 65 can be equal, and the rotational axes of the roll stand and the cam can be directly connected. The roll-over stand 64 rotates with the cam 65, when reaching the position similar to that shown in fig. 4, the mill bracket 67 is driven to rotate around the horizontal section, and the small mill 61 at the end is received in the machine table 1. In the process, the upper die 4 does not contact the small-sized mill 61, the nitrogen spring 41 presses the part to be processed in advance before the upper die 4 falls down to play a role of pre-compression, and the compression molding is realized after the upper die 4 is closed.

Then, in the first return state, the upper die 4 starts to ascend at a speed slower than that in the falling state. The pressing plate 35 rises together with the follow-up block 32, the cam 65 and the roll-over stand 64 rotate together under the action of the second reset torsion spring, the mill support 67 also starts to rotate under the action of the first reset torsion spring, and when the section capable of standing of the mill support 67 stands upright, the grinding state is achieved. At this time, the contact switch contacts with the upper side of the side arc opening 631 to send signals to the rotating motor 62, the mill motor 611 and the stamping control switch 13 of the stamping mechanism 2, the stamping control switch 13 stops the movement of the telescopic rod, and the lower end of the nitrogen spring 41 presses on the molded interior trim part to play a role in compressing and reducing vibration. And at the moment, the grinding head of the small-sized grinding machine 61 is positioned on the periphery of the lower die 5 and starts to rotate for grinding, and meanwhile, the rotating motor 62 drives the small-sized grinding machine 61 to rotate through the support sleeve 63 and the grinding machine support 67 so as to grind the periphery of the interior trim part smoothly. When the rotary motor 62 starts to rotate, the horizontal driver 642, which once pulled out of the mill stand 67, may also be higher than the horizontal section of the mill stand 67, so that the horizontal driver 642 should pull out of the mill stand 67 from the other side of the mill stand 67, which is opposite to the horizontal direction of rotation. When the small-sized grinder 61 rotates horizontally for one turn, the rotary motor 62 is automatically stopped, and the grinding state is completed.

The rotation angle sensor in the rotating motor 62 detects that the output shaft rotates for a circle and then sends signals to the mill motor 611 and the punching control switch 13, the small mill 61 stops rotating and grinding, and meanwhile, the punching control switch 13 enables the telescopic rod to ascend again, namely, the telescopic rod enters a second rising state until the molding device returns to the initial state and stops. And (4) taking down the interior trim part which is molded and polished by an operator, and feeding and repeating the process.

Obviously, the edge of the interior trim part is automatically polished after the die pressing is finished, the special step of polishing the edge of the interior trim part is reduced, the feeding and discharging time is saved, and the processing efficiency is improved.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The invention has been described above with reference to the accompanying drawings, and it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without such modifications.

Claims

1. The utility model provides a molding device for circular automobile ornaments, includes board (1), fixes lower mould (5) and punching press mechanism (2) on board (1), mould (4) are installed to the telescopic link tip of punching press mechanism (2), lower mould (5) are circular, its characterized in that: the grinding machine comprises a grinding mechanism (6) and a transmission mechanism (3), wherein the grinding mechanism (6) comprises a small-sized grinding machine (61), a rotating motor (62) installed below a top plate of a machine table (1), a grinding machine support (67) and a support turnover mechanism, a grinding machine through groove (12) consistent with the moving path of the small-sized grinding machine (61) is formed in the top of the machine table (1), an output shaft of the rotating motor (62) is located at the center of a lower die (5), the grinding machine support (67) is in an L shape and is in rotating connection with the output shaft, the grinding machine support comprises a horizontal section serving as a shaft and an upright section provided with the small-sized grinding machine (61) and an upright section, when the upright section is upright, a grinding head of the small-sized grinding machine (61) is located above the periphery of the lower die (5), and the support turnover mechanism comprises a support seat (66) fixed in the machine table (1), a cam, roll-over stand (64) pivot and cam (65) pivot level setting and interconnect, roll-over stand (64) have the level to stretch out to stir horizontal driving lever (642) of mill support (67), mill support (67) with it is two that reset torsion spring and reset torsion spring have cup jointed respectively in roll-over stand (64) pivot, under the state of polishing, the section of can standing upright just the horizontal segment height is higher than the height of all horizontal driving levers (642), cam (65) through drive mechanism (3) with the telescopic link links to each other.

2. A molding device for a circular automobile garnish according to claim 1, wherein: perpendicular fixed mounting has support sleeve pipe (63) on the output shaft, the horizontal segment inserts support sleeve pipe (63) with support sleeve pipe (63) rotate to be connected, reset torsion spring one end is connected to can erect the section, and the other end is connected to support sleeve pipe (63), support sleeve pipe (63) tip is equipped with the confession can erect side cambered surface opening (631) that the section stretches out, the width of side cambered surface opening (631) with can erect the diameter of section and cooperate, the cambered surface angle and the position of side cambered surface opening (631) with can erect the turned angle and the position of section and cooperate.

3. A molding device for a circular automobile garnish according to claim 2, wherein: the polishing and polishing device is characterized in that a pre-pressing mechanism is arranged in the upper die (4), the pre-pressing mechanism comprises a nitrogen spring (41) arranged at the center of the upper die (4), the lower end of the nitrogen spring (41) is pressed on an interior trim part in the polishing state, and the lower end of the nitrogen spring (41) is not in contact with the interior trim part in the initial state.

4. A molding device for a circular automobile garnish according to claim 3, wherein: the section of can standing vertically can touch side position department installs the contact inductor on side cambered surface opening (631), be equipped with the corner inductor of response pivot corner in rotating electrical machines (62), the contact inductor is signal connection respectively to rotating electrical machines (62), mill motor (611) of small-size mill (61) and punching press control switch (13) of punching press mechanism (2), the corner inductor is signal connection respectively to mill motor (611) and punching press control switch (13).

5. A molding device for a circular automobile garnish according to claim 1, wherein: the mill through groove (12) comprises a linear through groove for the small mill (61) to pass through when the mill support (67) is turned over and an annular through groove which is consistent with the path of the small mill (61) in the grinding stage, and the linear through groove is communicated with the annular through groove at the connection position.

6. A molding device for a circular automobile garnish according to claim 1, wherein: the roll-over stand (64) comprises radial connecting plates (641) which are circumferentially connected to the rotating shaft of the roll-over stand (64) at equal angles and horizontal deflector rods (642) which are vertically fixed at the end parts of the radial connecting plates (641), wherein the number of the radial connecting plates (641) and the number of the horizontal deflector rods (642) are respectively 3.

7. A molding device for a circular automobile garnish according to claim 6, wherein: from the punching state to the grinding state, the rotating angle range of the turnover frame (64) is 60 degrees to 140 degrees, and the rotating angle range of the cam (65) is less than 90 degrees.

8. A molding device for a circular automobile garnish according to claim 1, wherein: drive mechanism (3) including with cam (65) profile contact driven sliding pressure plate (35) structure, install vertical guide rail (31) on board (1) and fix follow-up block (32) on the telescopic link, follow-up block (32) with sliding pressure plate (35) structure is fixed links to each other, sliding pressure plate (35) structure with vertical guide rail (31) sliding fit.

9. A molding device for a circular automobile garnish according to claim 8, wherein: the sliding pressure plate (35) structurally comprises a sliding block (33) which is slidably connected into the vertical guide rail (31) and a pressure plate (35) which is fixedly connected to the bottom of the sliding block (33) through a vertical connecting rod (34), the pressure plate (35) is in contact transmission with the cam (65), and the sliding block (33) is fixedly connected with the follow-up block (32).