CN219238577U - Automatic feeding and discharging device and longitudinal moving mechanism thereof - Google Patents

Abstract

The utility model provides an automatic feeding and discharging device and a longitudinal moving mechanism thereof, wherein the automatic feeding and discharging device comprises a frame, the longitudinal moving mechanism is arranged on the frame, and the longitudinal moving mechanism comprises: the longitudinal mounting rack is arranged on the rack; the two third clamping arms and the two fourth clamping arms can move along a second direction relative to the longitudinal mounting frame, the two third clamping arms are arranged along the second direction, the two fourth clamping arms are arranged along the second direction, each third clamping arm extends along a first direction, each fourth clamping arm extends along the first direction, the first direction is perpendicular to the second direction and is parallel to the horizontal direction, and the two third clamping arms and the two fourth clamping arms can respectively clamp a work support for placing a workpiece. The automatic feeding and discharging device can realize automatic feeding and discharging of workpieces, and improves feeding efficiency.

Description

Automatic feeding and discharging device and longitudinal moving mechanism thereof

Technical Field

The utility model relates to an automatic feeding and discharging device and a longitudinal moving mechanism thereof.

Background

When detecting the ceramic wafer, the ceramic wafer needs to be sequentially fed into a detection device, and the detection device acquires an image of the ceramic wafer through shooting and judges whether the ceramic wafer is qualified or not according to the image. At present, manual feeding and discharging are mostly carried out in a manual mode, so that manual efficiency is low, and production cost is high.

Disclosure of Invention

The utility model mainly aims to provide an automatic feeding and discharging device and longitudinal movement thereof, which can realize automatic feeding and discharging and can sort detected workpieces.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a vertical moving mechanism of automatic unloader that goes up, automatic unloader that goes up includes the frame, vertical moving mechanism sets up in the frame, it includes:

the longitudinal mounting rack is arranged on the rack;

the two third clamping arms and the two fourth clamping arms can move along a second direction relative to the longitudinal mounting frame, the two third clamping arms are arranged along the second direction, the two fourth clamping arms are arranged along the second direction, each third clamping arm extends along a first direction, each fourth clamping arm extends along the first direction, the first direction is perpendicular to the second direction and is parallel to the horizontal direction, and the two third clamping arms and the two fourth clamping arms can respectively clamp a work support for placing a workpiece.

Preferably, both the third and fourth clamp arms are movable up and down.

Preferably, the lower sides of the third clamping arm and the fourth clamping arm are respectively provided with a horizontal extension part, the horizontal extension parts on the two third clamping arms extend in opposite directions, and the horizontal extension parts on the two fourth clamping arms also extend in opposite directions.

Preferably, the third clip arm and the fourth clip arm do not overlap in the second direction in a plan view.

Preferably, abutment blocks are provided on opposite sides of the two third and fourth clamp arms, the abutment blocks on the third clamp arm being provided on opposite sides of the fourth clamp arm with respect to the horizontal extension on the third clamp arm, the abutment blocks on the fourth clamp arm being provided on opposite sides of the third clamp arm with respect to the horizontal extension on the fourth clamp arm.

Preferably, the method comprises the steps of, the longitudinal movement mechanism further includes:

the first longitudinal module and the second longitudinal module are arranged on the longitudinal mounting frame, and the output ends of the first longitudinal module and the second longitudinal module move along the second direction;

the first extension arm and second extension arm, the one end of first extension arm with the output of the vertical module of first is connected, the one end of second extension arm with the output of the vertical module of second is connected, and two third arm clamps set up the other end at the first extension arm, and two fourth arm clamps set up the other end at the second extension arm.

The utility model also provides an automatic feeding and discharging device which comprises the longitudinal moving mechanism.

Preferably, the device further comprises a work support positioning mechanism, wherein the work support positioning mechanism comprises:

a bottom frame supported on the frame;

the work support is movably supported on the bottom frame, a notch is formed in the position, corresponding to the horizontal extension portion, of the work support, and the horizontal extension portions on the third clamping arm and the fourth clamping arm can be inserted into the notch.

Compared with the prior art, the utility model has the following beneficial effects:

the longitudinal moving mechanism is provided with two groups of clamping arms, one group of the two groups of clamping arms is only used for feeding materials towards the detection device, the other group of the two groups of clamping arms is only used for taking materials from the detection device, and the feeding process and the taking process can be simultaneously carried out, so that the efficiency of the whole process can be doubled.

Drawings

Fig. 1 and 2 are perspective views of a preferred embodiment according to the present utility model;

FIG. 3 is an enlarged view at A;

FIG. 4 is a block diagram of a rack;

FIG. 5 is a block diagram of a material vehicle;

FIG. 6 is a block diagram of a lifting mechanism;

FIG. 7 is a block diagram of a lateral movement mechanism;

fig. 8 is an enlarged view at B;

FIGS. 9 and 10 are block diagrams of the work support positioning mechanism;

fig. 11 and 12 are structural views of the longitudinal movement mechanism;

FIG. 13 is a block diagram of a third clamp arm;

fig. 14 is a structural view of the discharging mechanism.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.

An automatic feeding and discharging device is used for feeding workpieces into a detecting device for quality detection and taking out detected workpieces, and comprises a frame 1, two material trucks 2, two groups of lifting mechanisms 3, a transverse moving mechanism 4, a work support positioning mechanism 6, a longitudinal moving mechanism 5 and a discharging mechanism 7, wherein the two groups of lifting mechanisms 3 are arranged on the frame 1, the two material trucks 2 are respectively used for placing the workpieces to be detected and the workpieces which are detected and finished, the two groups of lifting mechanisms 3 are respectively used for lifting the workpieces upwards from the material trucks 2 and placing the workpieces which are subjected to discharging by the discharging mechanism 7 on the material trucks 2, the transverse moving mechanism 4 is used for transversely moving the workpieces to be detected onto the work support positioning mechanism 6 or transversely moving the workpieces which are detected to the position of discharging, and the longitudinal moving mechanism 5 is used for feeding the workpieces to be detected on the work support positioning mechanism 6 into the detecting device and taking the workpieces which are detected out of the detecting device and returning the workpieces to the work support positioning mechanism 6. The blanking mechanism 7 is used for receiving the detected workpiece sent by the transverse moving mechanism 4 and placing the qualified workpiece on the material vehicle 2 at the blanking position. For convenience of description, the material carriage 2 and the lifting mechanism 3 located at the loading position are referred to as a first material carriage and a first lifting mechanism, and the material carriage 2 and the lifting mechanism 3 located at the unloading position are referred to as a second material carriage and a second lifting mechanism.

The top of the frame 1 is provided with a mounting plate 11, a first opening 12 and a third opening 17 are respectively arranged on the mounting plate 11 and correspond to the first lifting mechanism and the second lifting mechanism, a second opening 15 and a fourth opening 18 are respectively arranged on the side surface of the frame 1 and correspond to the first lifting mechanism and the second lifting mechanism, the first material trolley and the second material trolley 2 can enable parts for bearing workpieces to be inserted into the frame 1 through the second opening 15 and the fourth opening 18 respectively and are located right below the first opening 12 and the third opening 17, the first lifting mechanism can enable the workpieces on the first material trolley to be lifted upwards and then pass through the first opening 12, and the second lifting mechanism can enable the detected workpieces to be placed on the second material trolley through the third opening 17.

Each of the material handling vehicles 2 includes a vehicle body 21, a support frame 24 provided on the vehicle body 21, and wheels 22 rotatably provided at a bottom of the vehicle body 21, the support frame 24 being for supporting a workpiece, the support frame 24 having a dimension in a left-right direction equal to or slightly smaller than a dimension of the second opening 15 in the left-right direction as viewed in a direction facing the second opening 15.

Preferably, a first guide frame 13 is disposed at a position corresponding to the second opening 15 in the frame 1, the first guide frame 13 is a horizontally disposed U-shaped structure, a middle part of the U-shaped structure is fixed on two sides of the second opening along the left-right direction, a plurality of guide bearings 14 are disposed on an upper surface of each of two sides of the U-shaped structure, axes of the plurality of guide bearings 14 are vertically disposed, and the guide bearings 14 on each side are arranged along a direction in which the first material vehicle enters from the second opening 15.

The underside of the support frame 24 is provided with two first guide rods 23, when the first material vehicle enters from the second opening 15, the two first guide rods 23 can respectively abut against the outer rings of the guide bearings 14 on the corresponding sides, so that the workpieces on the first material vehicle can be ensured to be in place accurately.

The lifting mechanism 3 comprises a lifting module 31 arranged on the frame 1 and a lifting plate 32 arranged at the output end of the lifting module 31, wherein the lifting module 31 is vertically arranged, an immovable part of the lifting module 31 is located below the mounting plate 11, the lifting plate 32 is horizontally arranged, the lifting plate 32 is driven by the lifting module 31 to move up and down and can pass through the first opening 12, and then a workpiece located on the supporting frame 24 can be lifted to a preset position.

Further, the supporting frame 24 includes a supporting frame 241, when viewed from a top, the supporting frame 241 is U-shaped, and the opening of the U-shape faces the lifting module 31, the lifting plate 32 is located in the supporting frame 241, and the lifting plate 32 can pass through the supporting frame 241 in the vertical direction so as to jack up the workpiece located on the supporting frame 24.

Specifically, the workpieces are placed on the tray 100, the tray 100 is placed on the supporting frame 24, and the lifting plate 32 lifts up the tray 100 during loading. The tray 100 is formed with a plurality of placement grooves for placing the workpieces. When the first pallet truck is used for loading, a plurality of pallets 100 are stacked on the support frame 24, and the lifting mechanism 3 moves the uppermost pallet 100 to a predetermined height each time, and the traverse mechanism 4 removes the uppermost pallet 100.

In order to ensure stability of the tray 100 in the process of being jacked up, three groups of second vertical guide rods 16 are arranged on the frame 1 and at the position of the first opening 12, the three groups of second vertical guide rods 16 are respectively arranged on three side walls except for the corresponding lifting module 31 in four side walls of the first opening 12, each group of second vertical guide rods 16 is provided with two, each vertical guide rod 16 is vertically arranged, and the two second vertical guide rods 16 in each group are arranged along the extending direction of the corresponding side wall. Two first vertical guide rods 33 are disposed on the stationary portion of the lifting module 31, and the two first vertical guide rods 33 extend along the extending direction of the side wall of the first opening 12 on the corresponding side. The space enclosed by the first vertical guide rod 33 and the second vertical guide rod 16 can just place the tray 100, and then can play a guiding role.

Two second clamping arms 52 are arranged on the frame 1 and located right above the first opening 12, the two second clamping arms 52 are arranged along the left-right direction, each second clamping arm 52 extends along the front-back direction corresponding to the left-right direction, and the two second clamping arms 52 can move towards or away from each other to clamp or unclamp the tray 100. The height of the two second clamping arms 52 is higher than the height of the top ends of the first vertical guide rod 33 and the second vertical guide rod 16. The two second clamping arms 52 are driven by a second double-headed cylinder 53 supported on the frame 1.

The lateral movement mechanism 4 includes a lateral movement module 41 disposed on the frame 1, and two first clamping arms 43 disposed on an output end of the lateral movement module 41, the lateral movement module 41 extends along the front-rear direction, the two first clamping arms 43 are arranged along the front-rear direction, each first clamping arm 43 extends along the left-right direction, and the two first clamping arms 43 can approach or depart from each other to clamp the tray 100. The two second clamping arms 52 clamp both sides of the tray 100 in the left-right direction, and the two first clamping arms 43 clamp both sides of the tray 100 in the front-rear direction. In actual production, during feeding, the two first clamping arms 43 are moved into position and opened, the two second clamping arms 52 are opened, and the lifting mechanism 3 lifts the tray 100 to be higher than the first vertical guide rod 33 and the second vertical guide rod 16; then, the two second clamping arms 52 clamp the tray 100 first, and the two first clamping arms 43 clamp the tray 100 again. The clamping of the tray 100 by the two second clamping arms 52 can ensure that the tray 100 maintains an accurate position in the left-right direction. The two first clamping arms 43 are driven by a first double-head air cylinder 42, and the first double-head air cylinder 42 is arranged on the output end of the transverse moving module 41.

Further, a circle of flange 101 is provided at a position of the tray 100 near the bottom, a clamping groove 46 is provided at a position of the two first clamping arms 43 near the bottom and near one side of the two first clamping arms 43, and when the first clamping arms 43 are clamped, the flange 101 can be inserted into the clamping groove 46, so that the clamping stability can be ensured.

The free ends of the two first clamping arms 33 are respectively provided with a first opening 44, the positions of the two opposite sides of the two first clamping arms 33 corresponding to the first openings 44 are respectively provided with a transmitting end and a receiving end of the first sensor 45, signals sent by the transmitting ends pass through the two first openings 44 and are received by the receiving ends, and whether the first clamping arms 43 clamp the tray 100 can be judged by whether the receiving ends can receive the signals. The first sensor 45 is of the prior art.

The work support positioning mechanism 6 comprises a lifting cylinder 63 arranged on the frame 1, a bottom frame 61 arranged on a cylinder rod of the lifting cylinder 63, and a work support 62 arranged on the bottom frame 61, wherein the cylinder rod of the lifting cylinder 63 extends upwards, the bottom frame 61 is horizontally arranged, the work support 62 is detachably arranged on the bottom frame 61, and the tray 100 moved by the transverse moving mechanism 4 can be placed on the work support 62 or the tray 100 can be removed from the work support 62 by the transverse moving mechanism 4. The lifting cylinder 63 is lifted and lowered to avoid the movement of the traverse mechanism 4. The center of the bottom frame 61 is located at a middle position of the movement range of the output end of the lateral movement module 41 along the front-rear direction.

A placement groove 67 is formed on the upper surface of the work support 62, the shape of the placement groove 67 is identical to the shape of the tray 100 in a top view, and the tray 100 can be just placed in the placement groove 67, so that the tray 100 and the work support 62 cannot move relatively. The two sides of the work support 62 along the front-back direction are provided with avoidance grooves 66, the avoidance grooves 66 are communicated with the placing grooves 67, the bottoms of the avoidance grooves 66 are lower than the bottoms of the placing grooves 67, the distance between the vertical side walls of the two avoidance grooves 66 is smaller than the dimension of the tray 100 along the front-back direction, and therefore when the tray 100 is placed on the work support 62, the flange 101 corresponding to the avoidance grooves 66 is in a suspended state, and the first clamping arms 43 are convenient for placing the tray 100 on the work support 62 or clamping the tray 100 on the work support 62. Preferably, the dimension of the avoidance groove 66 in the left-right direction is larger than the dimension of the first clip arm 43 in the left-right direction, so as to ensure that the first clip arm 43 can extend into the avoidance groove 66.

Preferably, a pneumatic caliper 64 is further disposed on the output end of the lifting cylinder 63, the axis of the pneumatic caliper 64 is disposed vertically and passes through the center of the bottom frame 61, the pneumatic caliper 64 has four jaws 65, the four jaws 65 are disposed at equal angles with respect to the axis of the pneumatic caliper 64, each jaw 65 can be synchronously far away or close to the axis of the pneumatic caliper 64, a positioning plate 68 is disposed on each jaw 65, the four positioning plates 68 are disposed at equal angles with respect to the axis of the pneumatic caliper 64, and when the jaws 65 synchronously move, the positioning plates 68 can be synchronously moved so that the free ends of the positioning plates 68 can abut against the inner side edge of the work support 62, so that the pushing work support 62 moves to an accurate position.

The longitudinal moving mechanism 5 comprises a longitudinal mounting frame 51 installed on the frame 1, two third clamping arms 54 and two fourth clamping arms 57 arranged on the longitudinal mounting frame 51, the two third clamping arms 54 and the two fourth clamping arms 57 can move along the left-right direction relative to the longitudinal mounting frame 51, the two third clamping arms 54 are used for clamping a work support 62 on the work support positioning mechanism 6 and sending the work support 62 to the detection device to detect a work piece on the work support positioning mechanism, and the two fourth clamping arms 55 are used for taking out the work support 62 in the detection device and placing the work support on the bottom frame 61 again. In actual production, two work supports 62 are adopted, when one of the work supports is displaced on the bottom frame 61, the other work support is positioned in the detection device, and in the process that the third clamping arm 54 moves the work support 62 on the bottom frame 61 towards the detection device, the fourth clamping arm 55 takes the work support 62 out of the detection device and moves towards the bottom frame 61, so that the detection efficiency is doubled.

Preferably, the two third clamping arms 54 can move toward and away from each other along the left-right direction to clamp or unclamp, and the two fourth clamping arms 57 can move toward and away from each other along the left-right direction to clamp or unclamp. Specifically, the longitudinal moving mechanism 5 further includes a first extension arm 511 and a second extension arm 512 provided on the longitudinal mounting frame 51, a first lift cylinder 56 provided at one end of the first extension arm 511, a second lift cylinder 59 provided at one end of the second extension arm 512, a third double-headed cylinder 55 provided on a cylinder rod of the first lift cylinder 56, a fourth double-headed cylinder 58 provided on a cylinder rod of the second lift cylinder 59, two of the third gripper arms 54 being driven by the third double-headed cylinder 55, and two of the fourth gripper arms 55 being driven by the fourth double-headed cylinder 55. The first extension arm 511 and the second extension arm 512 each extend in the left-right direction and are each movable in the left-right direction with respect to the longitudinal mount 51 so as to be capable of extending or retracting the third clip arm 54 and the fourth clip arm 55. Lifting or lowering of the work support 62 can be achieved by means of the first lifting cylinder 56 and the second lifting cylinder 59. The first extension arm 511 is driven by a first longitudinal module 510, an output end of the first longitudinal module 510 is connected to the other end of the first extension arm 511, the second extension arm 512 is driven by a second longitudinal module (not shown), and an output end of the second longitudinal module is connected to the other end of the second extension arm 512.

The lower sides of the third clamping arm 54 and the fourth clamping arm 55 are respectively provided with a horizontal extension part 510, the horizontal extension parts 510 on the two third clamping arms 54 extend in opposite directions, and the horizontal extension parts 510 on the two fourth clamping arms 55 extend in opposite directions, so that when the two third clamping arms 54 and the two fourth clamping arms 55 clamp the work support 62, the horizontal extension parts 510 can support the bottom of the work support 62, and the work support 62 is prevented from sliding downwards relative to the third clamping arm 54 and the fourth clamping arm 55.

In order to enable the horizontal extension 510 to smoothly enter the bottom of the work support 62, a notch 621 is provided at least at a position of the work support 62 corresponding to the horizontal extension 510.

The third arm 54 and the fourth arm 55 do not overlap in the left-right direction in a plan view, and thus collision between the third arm 54 and the fourth arm 55 during rapid movement can be effectively avoided. However, this causes the third clamp arm 54 and the fourth clamp arm 55 to be eccentric with respect to the center of the work support 62 in the front-rear direction when the work support 62 is clamped, one end of the work support 62 in the front-rear direction is tilted, and the other end is lowered, for which reason, on the opposite side of the two third clamp arms 54 and the two fourth clamp arms 55, there is provided an abutment block 511, the abutment block 511 being located closer to the corresponding third double-headed cylinder 55 or the fourth double-headed cylinder 58 than the corresponding horizontal extension 510, the abutment block 411 being capable of abutting against the abutment block 411 when the corresponding end of the work support 62 is tilted upward, and the abutment block 411 being capable of blocking the corresponding end of the work support 62 from being tilted upward.

The distance between the lower end surface of the abutment block 511 and the upper surface of the horizontal extension portion 510 is equal to or slightly greater than the thickness of the work support 62 when viewed along the front-rear direction, so as to ensure that the lower surface of the work support 62 can be supported on the upper surface of the horizontal extension portion 510, and the upper surface of the work support 62 can abut on the abutment block 511, thereby avoiding the inclination of the work support 62. In actual production, in order to facilitate the work support 62 to be able to be clamped between the horizontal extension portion 510 and the abutment block 511, the distance between the lower end surface of the abutment block 511 and the upper surface of the horizontal extension portion 510 may be set to be slightly larger than the thickness of the work support 62, and a slight inclination is allowed. The abutment block 511 may be made of plastic or the like.

The blanking mechanism 7 comprises a blanking bracket 71 supported on the frame 1, a first blanking module 72 arranged on the blanking bracket 71, a second blanking module 73 arranged on the output end of the first blanking module 72, a blanking cylinder 74 arranged on the output end of the second blanking module 73, two fifth clamping arms 75 arranged on the blanking cylinder 74 and a suction nozzle 77 arranged on one of the fifth clamping arms 75. The output end of the first blanking module 72 is arranged along the left-right direction, the second blanking module 73 is arranged along the left-right direction, the blanking cylinder 74 is arranged up and down and the cylinder rod extends downwards, two fifth clamping arms 75 are arranged along the left-right direction, and each fifth clamping arm 75 extends along the front-rear direction. The first clamping arm 41 can move to the position right below the first blanking module 72, the fifth clamping arm 75 can move to the position right above the first blanking module 72, and after the detected workpiece is put back to the bottom frame 61 through the work support 62, the first clamping arm 43 clamps the tray 100 again and moves to the position right below the first blanking module 72 under the driving of the transverse moving module 41. The fifth gripper arm 75 grips and moves the pallet 100 onto the blanking plate 78, the blanking plate 78 is provided on the frame 1, after the pallet 100 is placed onto the blanking plate 78, the suction nozzle 77 can move the detected unqualified workpiece to a specified position, and then place the pallet 100 with the qualified workpiece onto the second lifting mechanism and finally onto the second skip. Specifically, the control system of the automatic feeding and discharging device can communicate with the control system of the detecting device, the control system of the detecting device can detect result information to the control system of the automatic feeding and discharging device, the result information includes the position of the workpiece on the tray 100 and whether the workpiece located at the position is qualified, and the control system of the automatic feeding and discharging device controls the action of the suction nozzle 77 according to the result information.

The detection device is not subject to the protection of the present utility model and is not described in detail here. In actual production, the utility model can also be matched with other devices needing to be fed and discharged for feeding and discharging other devices needing to be fed and discharged.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (8)

1. The utility model provides a vertical moving mechanism of automatic unloader that goes up, automatic unloader includes the frame, vertical moving mechanism sets up in the frame, its characterized in that includes:

the longitudinal mounting rack is arranged on the rack;

the two third clamping arms and the two fourth clamping arms can move along a second direction relative to the longitudinal mounting frame, the two third clamping arms are arranged along the second direction, the two fourth clamping arms are arranged along the second direction, each third clamping arm extends along a first direction, each fourth clamping arm extends along the first direction, the first direction is perpendicular to the second direction and is parallel to the horizontal direction, and the two third clamping arms and the two fourth clamping arms can respectively clamp a work support for placing a workpiece.

2. The longitudinal movement mechanism of claim 1, wherein both the third and fourth clamp arms are movable up and down.

3. The longitudinal movement mechanism of claim 1, wherein the lower sides of the third and fourth arms are each provided with a horizontal extension, the horizontal extensions on the two third arms extend toward each other, and the horizontal extensions on the two fourth arms extend toward each other.

4. The longitudinal movement mechanism of claim 1, wherein the third clamp arm and the fourth clamp arm do not overlap in the second direction in a top view.

5. The longitudinal movement mechanism of claim 1, wherein abutment blocks are provided on opposite sides of the two third clamp arms and the two fourth clamp arms, the abutment blocks on the third clamp arm being provided on opposite sides of the fourth clamp arm relative to the horizontal extension on the third clamp arm, the abutment blocks on the fourth clamp arm being provided on opposite sides of the third clamp arm relative to the horizontal extension on the fourth clamp arm.

6. The longitudinal movement mechanism of claim 1, further comprising:

the first longitudinal module and the second longitudinal module are arranged on the longitudinal mounting frame, and the output ends of the first longitudinal module and the second longitudinal module move along the second direction;

the first extension arm and second extension arm, the one end of first extension arm with the output of the vertical module of first is connected, the one end of second extension arm with the output of the vertical module of second is connected, and two third arm clamps set up the other end at the first extension arm, and two fourth arm clamps set up the other end at the second extension arm.

7. An automatic loading and unloading device, characterized by comprising the longitudinal moving mechanism according to any one of claims 1-6.

8. The automatic loading and unloading device of claim 7, further comprising a work support positioning mechanism, the work support positioning mechanism comprising:

a bottom frame supported on the frame;

the work support is movably supported on the bottom frame, a notch is formed in the position, corresponding to the horizontal extension portion, of the work support, and the horizontal extension portions on the third clamping arm and the fourth clamping arm can be inserted into the notch.

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