CN211364108U

CN211364108U - Positioning device of code carving equipment

Info

Publication number: CN211364108U
Application number: CN201921615457.8U
Authority: CN
Inventors: 何柳; 黄西利; 郑宏良
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-08-28
Anticipated expiration: 2029-09-26

Abstract

The utility model discloses a carve positioner of sign indicating number equipment, including the connecting plate that is used for connecting the sign indicating number equipment of carving, two locating pins and four axial positioning mechanism, four axial positioning mechanism are the rectangle and arrange and set up in the front and back both sides of connecting plate, and four axial positioning mechanism are respectively along fore-and-aft direction sliding connection on the connecting plate, the work piece is followed and is extended to set up in the below of connecting plate about, and the work piece is located between two axial positioning mechanism of two axial positioning mechanism and the rear side of front side, four axial positioning mechanism can relieve the formula respectively and press from both sides tight fixed connection, two locating holes have been seted up on the upper surface of work piece, two locating pins are located on the lower surface at connecting plate middle part and can relieve the formula respectively and wear to locate. The utility model discloses a carve positioner of sign indicating number equipment realizes carving the accurate location of sign indicating number equipment and work piece, can prevent to carve the sign indicating number in-process work piece and rock, realizes carving the general and flexible manufacturing of sign indicating number equipment, reduce cost.

Description

Positioning device of code carving equipment

Technical Field

The utility model relates to a carve yard equipment, especially relate to a positioner who carves yard equipment.

Background

The position of the existing vehicle type VIN (vehicle identification number) code carving is mostly in the areas of a lower mounting plate/an upper mounting plate, a right front wheel cover and the like. As shown in fig. 1, due to the sealing requirement of the front cabin, when the code is engraved on the lower mounting plate, only the IP beam mounting hole (round hole) can be used as the main positioning, the air conditioner blower inlet and outlet hole (long hole) is used as the auxiliary positioning, the main positioning pin 17 and the auxiliary positioning pin 18 are respectively arranged on the code engraving device and are respectively used for the main positioning and the auxiliary positioning, then the lower mounting plate is pressed by the pressing block 21, due to only one round hole, the positioning of the workpiece is unstable in the code engraving process, the code engraving device is easy to shake relative to the workpiece, the engraving quality is affected, and in order to ensure the sealing property, the upper/lower mounting plate can not specially open the positioning hole for engraving, and the flexible use of the device is. As shown in FIG. 2, when the right front wheel cover is engraved, the front overhang mounting hole is used for positioning the engraving device, two positioning pins 2 are arranged on the engraving device for positioning, and the right front wheel cover is positioned and compressed through a three-air-claw cylinder 19 and a clamp pressure head 20. When the mounting hole of the functional part is used as the positioning hole of the code carving equipment, the aperture and the position of the hole of the functional part can be changed along with different vehicle types, so that the code carving equipment is difficult to flexibly use.

Disclosure of Invention

The utility model relates to a solve not enough among the prior art and accomplish, the utility model aims at providing a carve positioner of sign indicating number equipment realizes carving the accurate positioning of sign indicating number equipment and work piece, can prevent to carve the sign indicating number in-process work piece and rock, guarantees to beat and carves the quality, realizes carving the general and flexible manufacturing of sign indicating number equipment, reduce cost.

The utility model discloses a positioning device who carves yard equipment, including connecting plate, two locating pins and four axial positioning mechanism that are used for connecting the yard equipment of carving, four axial positioning mechanism be the rectangle arrange set up in both sides around the connecting plate, and four axial positioning mechanism respectively along fore-and-aft direction sliding connection in on the connecting plate, the work piece along controlling the direction extend set up in the below of connecting plate, and the work piece is located two of front side axial positioning mechanism and two of rear side between the axial positioning mechanism, four axial positioning mechanism respectively with the tight fixed connection of work piece releasable clamp, two locating holes have been seted up on the upper surface of work piece, two the locating pin is located on the lower surface at connecting plate middle part and respectively releasable formula is worn to locate the correspondence in the locating hole.

The utility model discloses a positioner of sign indicating number equipment can also be:

every axial positioning mechanism's lower part is equipped with a setting element respectively, the setting element can be dismantled fixed and locate on the internal surface of axial positioning mechanism lower part, two quad slits have been seted up respectively on the preceding lateral wall of work piece and the back lateral wall, every the quad slit corresponds with one respectively the position of setting element, every the setting element can be relieved respectively the formula is fixed wear to be located and is corresponded in the quad slit, axial positioning mechanism passes through the wedge with the work piece can be relieved the formula and press from both sides tight fixed connection.

The locating piece is a wedge-shaped locating piece, the upper surface of the wedge-shaped locating piece is arranged in an inclined mode from outside to inside from top to bottom, the wedge-shaped locating piece can be arranged in the square hole in a penetrating mode in a releasing mode, and the upper surface of the wedge-shaped locating piece is abutted to the upper hole wall of the square hole in a releasing mode.

Gaps are reserved between the left surface, the right surface and the lower surface of the wedge-shaped positioning block and the corresponding hole wall of the square hole.

The front side and the rear side of the connecting plate are respectively provided with an axial clamping cylinder for driving the axial positioning mechanisms, and each axial clamping cylinder is respectively connected with two axial positioning mechanisms positioned on the same side.

Each axial clamping cylinder is respectively connected with two axial positioning mechanisms positioned on the same side through a sliding block, the left end and the right end of each sliding block are respectively fixedly connected with the corresponding axial positioning mechanisms, and the end part of a piston rod of each axial clamping cylinder is respectively fixedly connected with the middle part of the corresponding sliding block.

The connecting plate is provided with four guide grooves extending in the front-back direction, the positions of the guide grooves correspond to the positions of the axial positioning mechanisms respectively, each axial positioning mechanism is provided with a guide block respectively, each guide block is connected to the corresponding guide groove in a sliding mode respectively, and the axial positioning mechanisms are connected to the connecting plate in a sliding mode in the front-back direction through the guide blocks and the guide grooves.

The upper surface of work piece is equipped with the sign indicating number face of carving on, two the locating hole set up respectively in the left and right sides of carving the sign indicating number face, the sign indicating number mouth has been seted up to the central authorities of connecting plate, it locates to carve the sign indicating number face under the sign indicating number mouth, the sign indicating number aircraft nose of carving the sign indicating number equipment wears to locate in carving the sign indicating number mouth, two the locating pin is equipped with respectively the left and right sides of carving the sign indicating number mouth.

The lower part of each axial positioning mechanism is respectively provided with a guide wheel, and each guide wheel is respectively and slidably abutted with the front side wall or the rear side wall of the workpiece in a releasable manner.

Two in-place detection switches are fixedly arranged in the middle of the connecting plate in a penetrating mode, each in-place detection switch corresponds to one positioning pin in position, and the lower end of each in-place detection switch is in releasable abutting contact with the upper surface of the workpiece.

The utility model discloses a positioning device who carves yard equipment, including connecting plate, two locating pins and four axial positioning mechanism that are used for connecting the yard equipment of carving, four axial positioning mechanism be the rectangle arrange set up in both sides around the connecting plate, and four axial positioning mechanism respectively along fore-and-aft direction sliding connection in on the connecting plate, the work piece along controlling the direction extend set up in the below of connecting plate, and the work piece is located two of front side axial positioning mechanism and two of rear side between the axial positioning mechanism, four axial positioning mechanism respectively with the tight fixed connection of work piece releasable clamp, two locating holes have been seted up on the upper surface of work piece, two the locating pin is located on the lower surface at connecting plate middle part and respectively releasable formula is worn to locate the correspondence in the locating hole. Like this, make through the connecting plate and carve a yard equipment and positioner together fixed, the positioning process of work piece, set up two locating pins and get into the locating hole simultaneously, difficult emergence location skew, guarantee positioning accuracy, can prevent to carve a yard equipment and work piece dislocation and cause and carve the sign indicating number skew, but set up four sets of axial positioning mechanism simultaneously and carry out effective clamp tightly, symmetry around this structure, bilateral symmetry, make the work piece atress even in all directions, realize compressing tightly fixedly comprehensively of work piece, prevent to carve yard in-process work piece and rock, guarantee that the VIN sign indicating number is beaten and carves the quality. In addition, the workpiece is provided with the special positioning hole for code carving, the diameter and the position of the positioning hole are determined without borrowing a mounting hole of the workpiece, multiple vehicle types can share one set of code carving equipment, the purpose of universal and flexible manufacturing of the code carving equipment is achieved, and the input cost of the code carving equipment is reduced. The workpiece in the invention can be a floor right front cross beam. Compared with the prior art, the utility model discloses a positioner of sign indicating number equipment has following advantage: the accurate positioning of the code carving equipment and the workpiece is realized, the workpiece can be prevented from shaking in the code carving process, the carving quality is guaranteed, the code carving equipment is universal and flexible to manufacture, and the cost is reduced.

Drawings

Fig. 1 is a schematic view of a positioning structure for code engraving of a lower mounting plate in the prior art.

Fig. 2 is a schematic diagram of a positioning structure for marking a right front wheel cover in the prior art.

Fig. 3 is a schematic structural diagram of a positioning device of the code carving apparatus of the present invention.

Fig. 4 is a schematic view of a right front cross beam structure of a floor of the positioning device of the code carving apparatus of the present invention.

Fig. 5 is a schematic view of a positioning structure of a wedge-shaped positioning block of a positioning device of a code carving apparatus of the present invention.

Fig. 6 is a schematic view of a positioning structure of a wedge-shaped positioning block of the positioning device of the code engraving device of the present invention.

Description of the figures

Axial positioning mechanism of 1 … connecting plate 2 … positioning pin 3 …

4 … locating hole 5 … square hole 6 … wedge-shaped locating block

7 … axial clamping cylinder 8 … slide block 9 … guide groove

10 … guide block 11 … code carving surface 12 … code carving mouth

13 … guide wheel 14 … position detection switch 15 … floor right front beam

16 … code carving machine head 17 … main positioning pin 18 … auxiliary positioning pin

19 … three-air claw cylinder 20 … clamp press head 21 … hold-down block

Detailed Description

In the present invention, if the direction (up, down, left, right, front, back, inside and outside) is described, the structure shown in fig. 3 is used as a reference for description, but the direction of practical use of the present invention is not limited thereto. Wherein, the two axial clamping cylinders 7 are oppositely arranged along the left-right direction (X direction); the two positioning pins 2 are oppositely arranged along the front-back direction (Y direction); the workpiece (the floor right front cross beam 15) is positioned at the inner side, and the wedge-shaped positioning block 6 is positioned at the outer side.

The following describes the positioning device of the code carving apparatus in further detail with reference to fig. 2 to 6.

The positioning device of the code engraving device of the utility model, please refer to fig. 2 to 6, comprises a connecting plate 1 for connecting the code engraving device, two positioning pins 2 and four axial positioning mechanisms 3, wherein the four axial positioning mechanisms 3 are arranged in a rectangular shape at the front and back sides of the connecting plate 1, and the four axial positioning mechanisms 3 are respectively connected on the connecting plate 1 in a sliding way along the front and back directions, the workpiece is arranged below the connecting plate 1 in a left and right extending way, the workpiece is positioned between the two axial positioning mechanisms 3 at the front side and the two axial positioning mechanisms 3 at the rear side, the four axial positioning mechanisms 3 are respectively and fixedly connected with the workpiece in a releasable clamping manner, two positioning holes 4 are formed in the upper surface of the workpiece, and the two positioning pins 2 are arranged on the lower surface of the middle of the connecting plate 1 and are respectively arranged in the corresponding positioning holes 4 in a detachable penetrating mode. Like this, make through connecting plate 1 and carve yard equipment and positioner together fixed, in the positioning process of work piece, set up two locating pins 2 and get into in locating hole 4 simultaneously, difficult emergence location skew, guarantee positioning accuracy, can prevent to carve yard equipment and work piece dislocation and cause and carve yard skew, it can the work piece carry out effective clamp tightly to set up four sets of axial positioning mechanism 3 simultaneously, symmetry around this structure, bilateral symmetry, it is even to make the work piece atress in all directions, it is fixed to realize compressing tightly comprehensively of work piece, prevent to carve yard in-process work piece and rock, guarantee that VIN sign indicating number beats the quality of carving. In addition, the special positioning hole 4 for code carving is formed in the workpiece, the installation hole of the workpiece is not used, the aperture and the position of the formed positioning hole 4 are determined, multiple vehicle types can share one set of code carving equipment, the purpose of universal and flexible manufacturing of the code carving equipment is achieved, and the input cost of the code carving equipment is reduced. The workpiece in the present invention may be the floor right front cross member 15. Compared with the prior art, the utility model discloses a positioner of sign indicating number equipment has following advantage: the accurate positioning of the code carving equipment and the workpiece is realized, the workpiece can be prevented from shaking in the code carving process, the carving quality is guaranteed, the code carving equipment is universal and flexible to manufacture, and the cost is reduced.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: every axial positioning mechanism 3's lower part is equipped with a setting element respectively, the setting element can be dismantled fixed and locate on the internal surface of axial positioning mechanism 3 lower part, two quad slit 5 have been seted up respectively on the preceding lateral wall of work piece and the back lateral wall, every quad slit 5 respectively with one the position of setting element corresponds, every the setting element can be relieved respectively and fixed wear to locate the correspondence in quad slit 5, axial positioning mechanism 3 passes through the wedge with the tight fixed connection of work piece releasable clamp. Like this, set up four quad slit 5 on the work piece and be used for the assistance-localization real-time of work piece to four setting elements penetrate tight work piece of clamp in the quad slit 5, press from both sides tightly effectually, further prevent to carve a yard in-process work piece and rock, the setting element is installed on axial positioning mechanism 3 through tolerance fit simultaneously, the installation is dismantled conveniently, when the setting element wearing and tearing to a certain extent, change alone the location can, maintenance process convenient and fast. On the basis of the technical solution described above, it is further preferable that the positioning element is a wedge-shaped positioning block 6, an upper surface of the wedge-shaped positioning block 6 is inclined from outside to inside from top to bottom, and the wedge-shaped positioning block 6 is detachably and fixedly inserted into the square hole 5. Therefore, the height of the wedge-shaped positioning block 6 is reduced from outside to inside in sequence, so that the wedge-shaped positioning block 6 can quickly and accurately penetrate into the square hole 5, and the positioning and clamping of a workpiece are realized. On the basis of the technical solution described above, it is further preferable that the upper surface of the wedge-shaped positioning block 6 is detachably abutted against the upper hole wall of the square hole 5, and gaps are formed between the left surface, the right surface and the lower surface of the wedge-shaped positioning block 6 and the corresponding hole wall of the square hole 5. Like this, owing to have four wedge locating pieces 6, if design into the multiaspect laminating, the condition of sticking out the card appears easily in the equipment positioning process, wedge locating piece 6 designs into the form that one side (upper surface) laminating, trilateral are vacated, can solve the clamping in-process wedge locating piece 6 problem of sticking out the card.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: the front side and the rear side of the connecting plate 1 are respectively provided with an axial clamping cylinder 7 for driving the axial positioning mechanisms 3, and each axial clamping cylinder 7 is respectively connected with two axial positioning mechanisms 3 positioned at the same side. Therefore, the axial clamping cylinder 7 can drive the axial positioning mechanism 3 to do linear reciprocating motion along the front-back direction (X direction) so as to clamp and release the workpiece of the axial positioning mechanism 3, and one set of axial clamping cylinder 7 at the same side controls two sets of axial positioning mechanisms 3, so that the structure is simple. On the basis of the technical solution described above, it is further preferable that each axial clamping cylinder 7 is connected to two axial positioning mechanisms 3 located on the same side through a sliding block 8, the left end and the right end of each sliding block 8 are fixedly connected to the corresponding axial positioning mechanism 3, and the end of the piston rod of each axial clamping cylinder 7 is fixedly connected to the middle of the corresponding sliding block 8. Like this, through setting up two axial positioning mechanism 3 of slider 8 connection homonymy, the piston rod of axial clamping cylinder 7 can drive two axial positioning mechanism 3 synchronous motion of homonymy through driving slider 8 reciprocating motion, and simple structure is effective to it is even to do benefit to the atress of work piece when pressing from both sides tightly.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: be equipped with four guide ways 9 that extend the setting along the fore-and-aft direction on the connecting plate 1, every the position of guide way 9 respectively with one axial positioning mechanism 3's position corresponds, every be equipped with a guide block 10 on the axial positioning mechanism 3 respectively, every the upper end of guide block 10 respectively with correspond axial positioning mechanism 3 fixed connection, every the lower extreme of guide block 10 sliding connection respectively in corresponding on the guide way 9, axial positioning mechanism 3 passes through guide block 10 with guide way 9 along fore-and-aft direction sliding connection in on the connecting plate 1. Thus, the guide block 10 is fixed on the axial positioning mechanism 3 and slides on the guide groove 9 along the front-back direction under the driving of the axial positioning mechanism 3, and the guide groove 9 and the guide block 10 are arranged, so that the axial positioning mechanism 3 can realize high-precision linear motion in the front-back direction, and the positioning precision is ensured.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: be equipped with on the upper surface of work piece and carve sign indicating number face 11, two locating hole 4 set up respectively in carve the left and right sides of sign indicating number face 11, connecting plate 1's central authorities have been seted up and have been carved sign indicating number mouth 12, it locates to carve sign indicating number face 11 carve the sign indicating number mouth 12 under, the sign indicating number aircraft nose 16 of carving the sign indicating number equipment wears to locate in carving the sign indicating number mouth 12, two locating pin 2 is equipped with respectively carve the left and right sides of sign indicating number mouth 12. Like this, carve sign indicating number face 11 setting and the upper surface of work piece, convenient operation when carving sign indicating number equipment and carving sign indicating number, connecting plate 1's central authorities are seted up and are carved sign indicating number mouth 12, avoid connecting plate 1 to shelter from and carve sign indicating number face 11, avoid connecting plate 1 one end opening to dodge and carve sign indicating number face 11 and influence connecting plate 1's structural strength, two locating pins 2 set up in 12 left and right sides in the sign indicating number mouth of carving, and the interval is great, is favorable to locating pin 2 to treat the location of carving the.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: the lower part of each axial positioning mechanism 3 is respectively provided with a guide wheel 13, and each guide wheel 13 is respectively and detachably and slidably abutted against the front side wall or the rear side wall of the workpiece. In this way, during the descending process of the code carving equipment, the guide wheel 13 carries out coarse guide on the code carving equipment, and the approximate positions of the code carving equipment and the workpiece are ensured.

The utility model discloses a positioning device of sign indicating number equipment, on the basis of the technical scheme of the preceding description, please refer to fig. 2 to fig. 6, can also be: two in-place detection switches 14 are fixedly arranged in the middle of the connecting plate 1 in a penetrating mode, each in-place detection switch 14 corresponds to one positioning pin 2 in position, and the lower end of each in-place detection switch 14 is in releasable abutting contact with the upper surface of the workpiece. Therefore, the detection switch is arranged to detect whether the code carving equipment is in place or not, and the accuracy of clamping and positioning is improved.

The specific work flow is as follows: the manual operation code carving equipment and the positioning device of the manual operation code carving equipment descend, the guide wheel 13 can conduct rough guide in the descending process, the approximate positions of the code carving equipment and a workpiece are guaranteed, the code carving equipment is moved manually to enable the positioning pin 2 to enter the positioning hole 4, after the code carving equipment descends to the proper position, the in-place detection switch 14 feeds back signals, the axial pressing air cylinder installed on the connecting plate 1 pushes the sliding block 8 to slide along the X direction, the axial positioning mechanism 3 is driven to move in the X direction, in the moving process of the axial positioning mechanism 3, the guide block 10 is driven to slide on the guide groove 9, the moving directions of four sets of axial positioning mechanisms 3 are guaranteed, when the axial positioning mechanism 3 moves to the proper position, the wedge-shaped positioning block 6 enters the square hole 5, the axial clamping air cylinder 7.

The above description is only for the specific embodiments of the present invention, but not for the scope of the present invention, all equivalent changes or modifications made according to the design spirit of the present invention should be considered as falling into the scope of the present invention.

Claims

1. A positioning device of code carving equipment is characterized in that: the four axial positioning mechanisms are arranged in a rectangular mode and arranged on the front side and the rear side of the connecting plate, are connected to the connecting plate in a sliding mode along the front and the rear direction respectively, extend below the connecting plate along the left and right direction, are located on the front side and located between the two axial positioning mechanisms and the two axial positioning mechanisms on the rear side, are connected with the workpiece in a releasable clamping and fixing mode respectively, are provided with two positioning holes on the upper surface of the workpiece, and are located on the lower surface of the middle portion of the connecting plate and are arranged in the corresponding positioning holes in a releasable penetrating mode respectively.

2. The positioning device of a coding device according to claim 1, characterized in that: every axial positioning mechanism's lower part is equipped with a setting element respectively, the setting element can be dismantled fixed and locate on the internal surface of axial positioning mechanism lower part, two quad slits have been seted up respectively on the preceding lateral wall of work piece and the back lateral wall, every the quad slit corresponds with one respectively the position of setting element, every the setting element can be relieved respectively the formula is fixed wear to be located and is corresponded in the quad slit, axial positioning mechanism passes through the wedge with the work piece can be relieved the formula and press from both sides tight fixed connection.

3. The positioning device of a coding device according to claim 2, characterized in that: the locating piece is a wedge-shaped locating piece, the upper surface of the wedge-shaped locating piece is arranged in an inclined mode from outside to inside from top to bottom, and the wedge-shaped locating piece is detachably fixed to penetrate through the square hole.

4. The positioning device of a coding device according to claim 3, characterized in that: the upper surface of the wedge-shaped positioning block is detachably abutted against the upper hole wall of the square hole, and gaps are reserved between the left surface, the right surface and the lower surface of the wedge-shaped positioning block and the corresponding hole wall of the square hole.

5. The positioning device of a coding device according to any of claims 1 to 4, characterized in that: the front side and the rear side of the connecting plate are respectively provided with an axial clamping cylinder for driving the axial positioning mechanisms, and each axial clamping cylinder is respectively connected with two axial positioning mechanisms positioned on the same side.

6. The positioning device of a coding device according to claim 5, wherein: each axial clamping cylinder is respectively connected with two axial positioning mechanisms positioned on the same side through a sliding block, the left end and the right end of each sliding block are respectively fixedly connected with the corresponding axial positioning mechanisms, and the end part of a piston rod of each axial clamping cylinder is respectively fixedly connected with the middle part of the corresponding sliding block.

7. The positioning device of a coding device according to any of claims 1 to 4, characterized in that: the connecting plate is provided with four guide grooves extending in the front-back direction, the positions of the guide grooves correspond to the positions of the axial positioning mechanisms respectively, each axial positioning mechanism is provided with a guide block respectively, the upper end of each guide block is fixedly connected with the corresponding axial positioning mechanism respectively, the lower end of each guide block is connected onto the corresponding guide groove in a sliding mode respectively, and the axial positioning mechanisms are connected onto the connecting plate in a sliding mode along the front-back direction through the guide blocks and the guide grooves.

8. The positioning device of a coding device according to any of claims 1 to 4, characterized in that: the upper surface of work piece is equipped with the sign indicating number face of carving on, two the locating hole set up respectively in the left and right sides of carving the sign indicating number face, the sign indicating number mouth has been seted up to the central authorities of connecting plate, it locates to carve the sign indicating number face under the sign indicating number mouth, the sign indicating number aircraft nose of carving the sign indicating number equipment wears to locate in carving the sign indicating number mouth, two the locating pin is equipped with respectively the left and right sides of carving the sign indicating number mouth.

9. The positioning device of a coding device according to any of claims 1 to 4, characterized in that: the lower part of each axial positioning mechanism is respectively provided with a guide wheel, and each guide wheel is respectively and slidably abutted with the front side wall or the rear side wall of the workpiece in a releasable manner.

10. The positioning device of a coding device according to any of claims 1 to 4, characterized in that: two in-place detection switches are fixedly arranged in the middle of the connecting plate in a penetrating mode, each in-place detection switch corresponds to one positioning pin in position, and the lower end of each in-place detection switch is in releasable abutting contact with the upper surface of the workpiece.