CN202591014U - Workpiece molding device - Google Patents

Abstract

The utility model discloses a workpiece die-sheathing device, which comprises a rotary feeding device, a rotary die-changing device, a front die-assembling device, a rear die-assembling device and a positioning device, wherein two ends of the surface of the rotary feeding device respectively bear a workpiece support plate, and the workpiece support plate clamps a workpiece and feeds the material along with the rotation of the rotary feeding device; the two ends of the surface of the rotary die changing device are respectively fixed with a die frame fixing seat, and the rotary die changing device can rotationally drive the die frame fixing seats; the front mold closing device can push the workpiece carrier plate to ascend and perform mold closing with the mold base fixing seat; a die closing plate is fixed at the top end of the rear die closing device and can be pushed to ascend and be closed with another die carrier fixing seat; the positioning device can lock and position the rotary feeding device and the rotary die changing device. The utility model discloses work piece cover die device simple structure, location are accurate, can improve production efficiency, improve the spraying quality.

Description

Workpiece molding device

technical field

The utility model relates to a mold covering device for workpieces, in particular to a mold covering device for workpieces with simple structure and precise positioning, which can improve production efficiency and spraying quality.

Background technique

With the improvement of living standards, the demand for toys is growing at an alarming rate. At the same time, consumers have higher and higher requirements for the appearance of toys, which provides opportunities and challenges for toy processing enterprises. The current toy painting process is becoming more and more complicated, which is reflected in: (1) the increase of local coloring points of toys; (2) the increase of coloring types, and the higher and higher requirements for the position accuracy of local spraying. Therefore, in order to realize partial painting, it is necessary to use mold sets.

At present, the domestic toy painting industry is still mainly in the state of manual mold painting, the working environment is very harsh, it is difficult to realize mass automatic production, and it is not conducive to quality control and progress control. In addition, some of them use automatic painting equipment, which have the disadvantages of low mold clamping accuracy and low painting quality. The main reason is that the position error is large when the feeding and mold changing device reciprocates, and the repeatability is not high, for example:

1. A painting robot that uses double cylinders plus rack and pinion to drive feeding and mold change. The specific implementation plan is: two pairs of cylinders and racks are arranged symmetrically with respect to the gear axis, and one side of the cylinder extends to push the rack forward, while the other One side of the cylinder shrinks and pulls the other rack to move backward, and the gear shaft meshing with the rack is subjected to two rotational moments (the same torque direction) to drive the turntable to rotate 180°; the turntable can be turned 180° by reversing the working state of the cylinder.

2. A painting robot that uses a motor to drive the intermittent rotation of the cam divider to realize material feeding and mold change. The specific implementation plan is: the motor drives the cam divider to work through the reducer, and the output shaft of the cam divider rotates 180 degrees for a fixed number of revolutions per motor rotation. , The turntable and the output shaft of the cam divider are rigidly connected to realize continuous rotation.

The structure design of the above-mentioned first type of robot is complicated, assembly and debugging are difficult, and the gap between the gear and the rack leads to a relatively large error in the position of the feeding and turntable rotation, resulting in low repeatability during feeding, and inaccurate mold clamping with flying oil. The initial position of the second robot is not easy to adjust, the motor control is complicated, and the precision of mold clamping depends entirely on the precision of the cam splitter. In addition, the above two solutions rely on the positioning of the drive itself, without external mechanical auxiliary positioning, and it is difficult to guarantee the accuracy of the rotational position.

Based on above-mentioned deficiency, therefore, need a kind of workpiece cover mold device that is installed on the paint spraying machine, simple in structure, accurate in positioning, can improve production efficiency, improve spraying quality.

Utility model content

The purpose of the utility model is to provide a workpiece sleeve mold device installed on a paint spraying machine, which has a simple structure, precise positioning, and can improve production efficiency and spraying quality.

In order to achieve the above-mentioned purpose, the workpiece molding device provided by the utility model is installed on the base plate of the paint spraying machine, and the partially sprayed workpiece is molded, including a rotary feeding device, a rotary mold changing device, a front mold clamping device, and a rear mold clamping device. Device and positioning device, the two ends of the surface of the rotary feeding device each carry a workpiece carrier, the workpiece carrier clamps the workpiece and feeds with the rotation of the rotary feeding device; the two ends of the surface of the rotary mold changing device One mold frame fixing seat is respectively fixed, and the said rotary mold changing device can rotatably drive the said mold frame fixing seat, so that one of said mold frame fixing seats is directly above one of said workpiece carrier plates; The front mold clamping device pushes the workpiece carrier up and closes the mold base with the mold base when the mold frame fixing seat is facing the workpiece carrier plate; the rear mold clamping device fixes a clamping plate at the top , when the mold frame fixing seat is facing the workpiece carrier plate, the clamping plate is pushed up and molded with another mold frame fixing seat; , the rotary feeding device and the rotary mold changing device are locked and positioned.

Preferably, the rotary feeding device includes a mounting seat, a first rotary driving element, a rotating shaft and a feeding turntable, the mounting seat is fixed on the base plate, the first rotary driving element is fixed in the mounting seat, One end of the rotating shaft is connected to the output end of the first rotary driving element, and the other end is fixedly connected to the center of the feeding turntable through the mounting seat. The first rotating drive element is used to drive the rotating shaft to drive the feeding turntable to rotate, so as to achieve the purpose of rotating and feeding circularly. The structure is simple and the control is convenient.

Preferably, the rotary mold changing device includes a bearing base, a second rotary driving element, a drive shaft and a mold changing turntable, the bearing base is fixed on the base plate, and the second rotating driving element is fixed on the bearing On the seat, one end of the drive shaft is connected to the output end of the second rotary drive element, and the other end is fixedly connected to the center of the mold changing turntable. The drive shaft is driven by the second rotary drive element to drive the mold change turntable to rotate, so as to achieve the purpose of switching the positions of the mold frame fixing seats at both ends, the structure is simple, and the control is convenient.

Specifically, the rotary mold changing device further includes a thrust ball bearing, the lower race of the thrust ball bearing is fixed to the bearing seat, and the upper race of the thrust ball bearing is fixed to the drive shaft through socketing. By installing the thrust ball bearing on the bearing seat, the gravity carried by the rotary mold changing device is completely transferred to the bearing seat through the thrust ball bearing, thereby reducing the second rotation. The pressure on the drive element enables the rotary mold changing device to operate safely and accurately.

Preferably, the front mold clamping device has the same structure as the rear mold clamping device.

Preferably, the front clamping device includes a fixed seat, a double-headed cylinder and a buffer device, the fixed seat is fixed on the base plate, the buffer device is installed at the end of the cylinder body of the double-headed cylinder, the The end of the piston rod of the double-headed cylinder protrudes from the cylinder body and can interfere with the buffer device. Utilizing the expansion and contraction effect of the double-headed cylinder, the workpiece carrier can be pushed up, so as to achieve mold clamping with the mold frame holder, and the other end of the double-headed cylinder can be moved by the collision with the buffer device. Cushioning prevents it from being extended too much or too fast to damage the workpiece carrier plate or the mold base fixing seat, and effectively protects the mold base fixing base.

Specifically, the buffer device includes a number of guide posts, a number of compression springs and a collision plate, the guide posts are distributed around the lower end of the double-headed cylinder block, and the collision plate is slidably sleeved on the guide rail up and down. and the lower bottom surface is in conflict with the end of the guide post, the compression spring is sleeved on the guide post, one end is in conflict with the cylinder body of the double-headed cylinder, and the other end is in conflict with the side of the conflict plate , the end of the piston rod of the double-headed cylinder passes through the abutment plate and can abut against the lower bottom surface of the abutment plate. The end of the piston rod of the double-head cylinder rises excessively by fitting the collision plate on the guide post, and setting the compression spring between the cylinder body of the double-head cylinder and the collision plate. Or when it is too fast, it can realize the function of buffering, the structure is simple, and the use is safe and reliable.

Preferably, the positioning device includes a fixed frame, a thin air cylinder, a guide block, a positioning pin and a positioning sleeve, the fixed frame is fixed, the fixed frame is installed on the base plate, and the thin air cylinder is fixed on the fixed and the output end is connected with the positioning pin, the positioning pin passes through the guide block and is fixed with the positioning sleeve, and the positioning sleeve is fixed on the rotary feeding device and the rotary mold changing device. By using the thin air cylinder to push the positioning pin, the positioning pin is clamped and fixed on the positioning sleeve, so as to realize the precise positioning of the rotary feeding device and the rotary mold changing device, and prevent its position from being shifted. Make mold clamping inaccurate and produce flying oil phenomenon.

Compared with the prior art, because the utility model uses the rotary feeding device to rotate the workpiece carrier plate installed at both ends, the workpiece clamped on the workpiece carrier plate is driven to reciprocate and realize circular feeding , and use the rotary mold changing device to switch the positions of the mold frame holders installed at both ends, so that the workpiece carrier plate and the mold frame holders can face each other up and down, and then use the positioning device to align them Carry out precise positioning to ensure the accuracy of the positions of the workpiece carrier plate and the mold frame holder. Finally, push the workpiece carrier plate through the front mold clamping device to mold with the mold frame holder. After mold clamping, the workpiece can be Fast and high-precision spraying of local areas, and push the clamping plate through the rear mold clamping device to close the mold with another mold base holder. The structure is simple and easy to assemble, and the feeding of the rotary feeding device is carried out simultaneously with the mold changing process of the rotary mold changing device, and the mold clamping process of the front mold clamping device is carried out simultaneously with the mold clamping process of the rear mold clamping device , greatly reducing working hours, greatly improving production efficiency, which is conducive to large-scale automated production. In addition, by setting the positioning device, the rotary feeding device and the rotary mold changing device can be accurately positioned, so that the workpiece carrier plate and the mold frame fixing seat and the clamping plate and another mold frame fixing seat can be accurately aligned. Position, to ensure the repeatability of feeding and mold change, so as to ensure the reliability of spraying and greatly improve the quality of spraying.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model workpiece covering mold device.

Fig. 2 is a structural schematic diagram of the rotary feeding device in the workpiece molding device of the present invention.

Fig. 3 is a schematic structural view of the rotary mold changing device in the workpiece mold setting device of the present invention.

Fig. 4 is a schematic structural view of the front mold clamping device in the workpiece mold setting device of the present invention.

Fig. 5 is an enlarged view of part A in Fig. 4 .

Fig. 6 is a structural schematic diagram of the positioning device in the workpiece molding device of the present invention.

Detailed ways

As shown in Figure 1, the utility model workpiece molding device 100 is installed on the substrate 400 of the paint spraying machine, and the workpiece (not shown in the figure) that is partially sprayed is molded, including a rotary feeding device 1, a rotary mold changing device 2, The front mold clamping device 3 , the rear mold clamping device 4 and the two positioning devices 5 ; the rotary feeding device 1 , the rotary mold changing device 2 , the front mold clamping device 3 and the rear mold clamping device 4 are all installed on the base plate 400 . The base plate 400 can fix the rotary feeding device 1 , the rotary mold changing device 2 , the front clamping device 3 and the rear clamping device 4 on the same reference, which can greatly reduce position errors and ensure accurate mold clamping.

Referring to Fig. 1 again, two ends of the surface of the rotary feeding device 1 each carry a workpiece carrier, i.e. a first workpiece carrier 201 and a second workpiece carrier 202, and the first and second workpiece carriers 201, 202 can be The workpiece is clamped and fed with the rotation of the rotary feeding device 1; the two ends of the surface of the rotary mold changing device 2 are respectively fixed with a mold frame fixing seat, that is, the first mold frame fixing seat 301 and the second mold frame fixing seat 302, the rotary mold changing device 2 rotatably drives the first and second mold frame fixing seats 301, 302, so that one of the mold frame fixing seats is directly above one of the workpiece carrier plates; the front The mold clamping device 3 pushes the workpiece carrier up and closes the mold base with the mold base when one of the mold frame fixing seats is facing directly with a workpiece carrier; the top of the rear mold clamping device 4 fixes a Clamping plate 41, when described mold frame fixing seat and workpiece support plate are opposite, promote described clamping plate 41 to rise and mold with another mold frame fixing seat; When the workpiece carrier plate is facing, it is locked and positioned.

As shown in FIG. 2 , the rotary feeding device 1 includes a mounting base 11 , a first rotary driving element 12 , a rotating shaft 13 and a feeding turntable 14 . The mounting seat 11 is fixed on the base plate 400, the first rotating drive element 12 is fixed in the mounting seat 11, the first rotating driving element 12 is an adjustable swing cylinder with cushioning, the The swing cylinder can drive the feeding turntable 14 to rotate 180 degrees, and the rotation of the feeding turntable 14 can be realized by inversion by 180 degrees. One end of the rotating shaft 13 is connected to the output end of the first rotary driving element 12 , and the other end is fixedly connected to the center of the feeding turntable 14 through the mounting seat 11 . The rotating shaft 13 is driven by the first rotating driving element 12 to drive the feeding turntable 14 to rotate, so as to achieve the purpose of rotating and feeding circularly. The structure is simple and the control is convenient.

Please refer to FIG. 3 , the rotary mold changing device 2 includes a bearing seat 21 , a second rotary driving element 22 , a driving shaft 23 , a mold changing turntable 24 and a thrust ball bearing 25 . The bearing seat 21 is fixed on the base plate 400, the second rotary driving element 22 is fixed on the bearing seat 21, and the second rotating driving element 22 is an adjustable swing cylinder with cushioning. The swing cylinder can drive the die change turntable 24 to rotate 180 degrees, and the die change turntable 24 can be rotated 180 degrees by reversing. One end of the drive shaft 23 is connected to the output end of the second rotary drive element 22 , and the other end is fixedly connected to the center of the die changing turntable 24 . The lower race of the thrust ball bearing 25 is fixed to the bearing seat, and the upper race of the thrust ball bearing 25 is socketed and fixed to the drive shaft 23 . Utilize the second rotary driving element 22 to drive the drive shaft 23 and then drive the mold changing turntable 24 to rotate, so as to achieve the purpose of switching the positions of the first and second mold frame fixing seats 301, 302 with each other. Simple and convenient controls. By installing the thrust ball bearing 25 on the bearing seat 21, the gravity carried by the rotary mold changing device 2 is completely transferred to the bearing seat 21 through the thrust ball bearing 25, thereby reducing the pressure on the bearing seat 21. The pressure on the second rotary driving element 22 enables the rotary mold changing device 2 to operate safely and accurately.

As shown in FIG. 4 , the front mold clamping device 3 has the same structure as the rear mold clamping device 4 . The front mold clamping device 3 is arranged under the workpiece carrier plate when the workpiece carrier plate and the mold frame fixing seat are facing each other. The front mold clamping device 3 includes a fixed seat 31, a double-headed cylinder 32 and a buffer device 33. The seat 31 is fixed on the base plate 400, the buffer device 33 is installed at the end of the cylinder body of the double-headed cylinder 32, and the end of the piston rod of the double-headed cylinder 32 protrudes from the cylinder body and can be connected with the buffer device. 33 conflicts. The expansion and contraction of the double-headed cylinder 32 can be used to push the first and second workpiece carrier plates 201, 202 up, so as to achieve mold clamping with the first and second mold frame fixing seats 301, 302, and through them The other end is in conflict with the buffer device 33, which can buffer the double-headed cylinder 32 to prevent it from extending too much or too fast and damaging the first and second workpiece carrier plates 201, 202 or the first and second workpiece carriers. The two formwork fixing seats 301, 302 effectively protect the first and second formwork fixing seats 301, 302.

Please refer to Fig. 5, specifically, the buffer device 33 includes a number of guide posts 33a, a number of compression springs 33b and a collision plate 33c, the guide posts 33a are distributed around the lower end of the double-headed cylinder 32, and the collision The plate 33c is slidably sleeved on the guide post 33a up and down, and the lower bottom surface is in contact with the end of the guide post 33a, the compression spring 33b is sleeved on the guide post 33a, and one end is connected to the double head The cylinder body of the cylinder 32 is in conflict, and the other end is in conflict with the side of the conflict plate 33c. The end of the piston rod of the double-headed cylinder 32 passes through the conflict plate 33c and can conflict with the lower bottom surface of the conflict plate 33c. By fitting the conflicting plate 33c on the guide post 33a, and setting the compression spring 33b between the cylinder block of the double-headed cylinder 32 and the conflicting plate 33c, the double-headed cylinder 32 When the end of the piston rod rises too much or too fast, it can realize the function of buffering, the structure is simple, and the use is safe and reliable.

Please refer to Fig. 6 again, the utility model workpiece cover mold device 100 comprises two positioning devices 5, and the structure of two described positioning devices 5 is identical, is respectively arranged on the described bearing seat 21, to described feeding turntable 14 and mold changing The positioning of the turntable 24 can of course also be arranged on the base plate 400 . The positioning device 5 includes a fixed frame 51, a thin cylinder 52, a guide block 53, a positioning pin 54 and a positioning sleeve 55, and the fixed device also includes a set screw 56, and the fixed frame 51 is installed on the bearing seat 21 , the thin cylinder 52 is fixed on the fixed frame 51 and the output guide is connected with the positioning pin 54, the positioning pin 54 passes through the guide block 53 and is fixed with the positioning sleeve 55, and the positioning sleeve 55 is fixed on the parts that need to be positioned. The positioning sleeve 55 of the utility model is respectively fixed on the rotary feeding device 1 and the rotary mold changing device 2. The set screw 56 protrudes rotatably from the guide of the guide block 53. In the hole 53a, the size of the guide hole 53a is adjusted, and then the positioning pin 54 is guided. By using the thin cylinder 52 to push the positioning pin 54, the positioning pin 54 is clamped and fixed on the positioning sleeve 55, thereby realizing the precise positioning of the rotary feeding device 1 and the rotary mold changing device 2, preventing Its position shifts and the mold clamping is inaccurate, resulting in the phenomenon of flying oil.

Based on the above and in conjunction with Figures 1 to 6, the working principle of the utility model workpiece molding device 100 is described in detail below, as follows:

First install the unpainted workpiece on the first workpiece carrier 201 of the rotary feeding device 1, control the first rotary drive element 12 to rotate 180 degrees, and the feeding turntable 14 drives the first workpiece carrier 201 Rotate 180 degrees, at the same time, control the second rotary drive element 22 to rotate 180 degrees, the mold changing turntable 24 drives the first mold frame fixing seat 301 to rotate 180 degrees, so that the first mold frame fixing seat 301 is The ground is above the first workpiece carrier plate 201; at this time, the positioning sleeves 55 on the feeding turntable 14 and the positioning sleeves 55 on the mold changing turntable 24 are respectively facing the respective positioning pins 54, and then respectively Control the thin cylinder 52 so that the thin cylinder 52 pushes the positioning pin 54 out, and is clamped with the positioning sleeve 55 under the guidance of the guide block 53, thereby fixing the feeding turntable 14 and The mold changing turntable 24, when the rotary feeding device 1 and the rotary mold changing device 2 are accurately aligned, controls the double-headed cylinder 32 of the front mold clamping device 3, so that the output end of the double-headed cylinder 32 extends Push out and push the first workpiece carrier 201, the first workpiece carrier 201 rises together with the loaded workpiece, when it is close to the first mold frame fixing seat 301, continue to push the first workpiece carrier The plate 201 is molded with the first mold base fixing seat 301 . Then, control the paint spraying device (not shown) above the workpiece molding device to spray paint on the workpiece; at the same time, install another unpainted workpiece on the second workpiece carrier plate 202, And start described rear mold clamping device 4, make described rear mold clamping device 4 push described clamping plate mold 41, and then promote described clamping plate 41 to rise and clamp mold with described second mold frame holder 302; And in closing Post-mold control the cleaning device (not shown) above the workpiece molding device to clean the second mold frame fixing seat 302 . After the painting is finished, control the front mold clamping device 3 to make the output end of the double-head cylinder 32 move down, and then drive the first workpiece carrier plate 201 to move down, and place it on the feeding turntable again 14; control the rear mold clamping device 4 at the same time, so that the second mold frame fixing seat 302 is separated from the clamping plate 41; then control the positioning device 5, so that the positioning device 5 is aligned with the feeding carousel 14 and the mold change turntable 24 are unlocked; after the unlocking is completed, control the first rotary drive element 12 and the second rotary drive element 22 to rotate 180 degrees, at this time, the first workpiece carrier plate 201 and the second workpiece carrier The position of the plate 202 is reversed, the positions of the first mold frame fixing seat 301 and the second mold frame fixing seat 302 are reversed, and then the workpieces that have been sprayed on the first workpiece carrier plate 201 are unloaded, and the above steps are repeated again The next unpainted workpiece can be sprayed.

Because the utility model rotates the first and second workpiece carrier plates 201 and 202 installed at both ends by using the rotary feeding device 1 to drive and clamp the first and second workpiece carrier plates 201 and 202 The workpiece on the top is reciprocatingly rotated to realize circular feeding, and the position of the first and second mold frame fixing seats 301 and 302 installed at both ends is switched by using the rotary mold changing device 2, so that the first and second mold frame fixing seats 301, 302 The second workpiece carrier plates 201, 202 and the first and second formwork holders 301 and 302 can face each other up and down, and then use the positioning device 5 to precisely position them to ensure that the first and second workpiece carriers The positions of the plates 201, 202 and the first and second mold base holders 301, 302 are accurate. Finally, one of the workpiece carrier plates is pushed forward by the front mold clamping device 3 to fit with the opposite mold base holder. After the mold is closed, the workpiece can be quickly sprayed with high precision in a local area, and the clamping plate 41 is pushed forward by the rear mold clamping device 4 to close the mold with another mold base holder. After the mold is closed, it can be conveniently The mold frame fixing seat adhered to spray paint is quickly cleaned, the whole process is simple in structure and easy to assemble, and the feeding of the rotary feeding device 1 is carried out simultaneously with the mold changing process of the rotary mold changing device 2, and the front mold clamping device The mold clamping process of 3 is carried out simultaneously with the mold clamping process of the rear mold clamping device 4, which greatly reduces working time, greatly improves production efficiency, and is conducive to large-scale automatic production. In addition, by setting the positioning device 5, the rotary feeding device 1 and the rotary mold changing device 2 are accurately positioned, so that the workpiece carrier plate and the mold frame fixing seat and the clamping plate 41 can be connected to another mold frame fixing seat. Accurate alignment ensures the repeatability of feeding and mold change, thereby ensuring the reliability of spraying and greatly improving the quality of spraying.

What is disclosed above is only a preferred example of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, equivalent changes made according to the patent scope of the utility model still belong to the scope covered by the utility model .

Claims (8)

1. a workpiece cover die device is installed on the substrate of paint spraying machine, and locally sprayed workpiece is carried out cover die, it is characterized in that, comprising: swivel feeding device, rotation mould changing device, preceding mold closing mechanism, back mold closing mechanism and positioner; A workpiece support plate is respectively carried at said swivel feeding apparatus surface two ends, said workpiece of said workpiece support plate clamping and the feeding with said swivel feeding device rotation; Each fixing mould bases holder of two ends, said rotation mould changing device surface, said rotation mould changing device drives said mould bases holder rotationally, and make wherein a said mould bases holder is in the wherein top of a said workpiece support plate over against ground; Before said mold closing mechanism said mould bases holder and workpiece support plate over against the time, the said workpiece support plate rising of pushing tow is also carried out matched moulds with said mould bases holder; The fixing matched moulds plate in mold closing mechanism top, said back, said mould bases holder and workpiece support plate over against the time, promote said matched moulds plate rising and with another mould bases holder matched moulds; Said positioner said mould bases holder and workpiece support plate over against the time, swivel feeding device and rotation mould changing device are carried out locking positioning.

2. workpiece cover die device as claimed in claim 1; It is characterized in that: said swivel feeding device comprises mount pad, first rotation driving element, rotating shaft and the feed rotary table; Said mount pad is fixed on the said substrate; The said first rotation driving element is fixed in the said mount pad, and an end of said rotating shaft is connected with the output of the said first rotation driving element, and the other end passes said mount pad and is connected with said feed rotary table center fixation.

3. workpiece cover die device as claimed in claim 1; It is characterized in that: said rotation mould changing device comprises load bearing seat, second rotation driving element, driving shaft and the die change rotating disk; Said load bearing seat is fixed on the said substrate; The said second rotation driving element is fixed on the said load bearing seat, and an end of said driving shaft is connected with the output of the said second rotation driving element, and the other end is connected with the center fixation of said die change rotating disk.

4. workpiece cover die device as claimed in claim 3; It is characterized in that: said rotation mould changing device also comprises thrust ball bearing; The bottom race of said thrust ball bearing and said load bearing seat are fixed, and the top race of said thrust ball bearing and said driving shaft socket are fixed.

5. workpiece cover die device as claimed in claim 1 is characterized in that: mold closing mechanism is identical with the structure of said back mold closing mechanism before said.

6. workpiece cover die device as claimed in claim 1; It is characterized in that: mold closing mechanism comprises holder, double end cylinder and buffer unit before said; Said holder is fixed on the said substrate; Said buffer unit is installed on the cylinder body end of said double end cylinder, and the end of the piston rod of said double end cylinder stretches out said cylinder body and can conflict with said buffer unit.

7. workpiece cover die device as claimed in claim 6; It is characterized in that: said buffer unit comprises some guide pillars, some compression springs and conflict plate; Said guide pillar be distributed in said double end cylinder block lower end around, said conflict plate can slide up and down to be socketed on the said guide pillar, and the end of bottom surface and said guide pillar is conflicted; Said compression spring housing is connected on the said guide pillar; The cylinder body of one end and said double end cylinder is conflicted, and conflicts in the side of the other end and said conflict plate, and the end of the piston rod of said double end cylinder passes said conflict plate and can conflict with the bottom surface of said conflict plate.

8. workpiece cover die device as claimed in claim 1; It is characterized in that: said positioner comprises fixed mount, slim cylinder, guide pad, alignment pin and positioning sleeve; Said fixed mount is installed on the said substrate; Said slim cylinder is fixed on the said fixed mount and output is connected with said alignment pin, and said alignment pin passes said guide pad and said positioning sleeve matching and fixing, and said positioning sleeve is fixed on said swivel feeding device and the said rotation mould changing device.

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