Positioning tool and electric appliance box cover assembly line

Abstract

The utility model provides a positioning tool and an electric appliance box cover assembly line, relates to the field of electric appliance box cover assembly, and solves the problems that a manual electric appliance box cover positioning mode is poor in positioning effect, time-consuming, labor-consuming and high in operation difficulty. The positioning tool comprises a base, fixed plate assemblies, a driving device and movable plate assemblies, the driving device and the fixed plate assemblies are both fixed to the base, and all the fixed plate assemblies and all the movable plate assemblies are matched to define a preset space used for containing workpieces; the driving devices are in driving connection with the corresponding moving plate assemblies and used for driving the moving plate assemblies to be movably arranged on the base, so that the size of the preset space is adjusted, and then the driving devices are matched with the fixing plate assemblies to clamp and fix the workpieces from the peripheries of the workpieces. Due to the fact that the size of the preset space can be conveniently adjusted, workpieces can be conveniently placed or taken out, and electric appliance box covers of different models can be clamped and positioned from the periphery, so that arraying of the electric appliance box covers is achieved, and the follow-up assembling efficiency of the electric appliance box covers is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical box cover assembly technology, and in particular to a positioning tool and an electrical box cover assembly line. Background Technology

[0002] The electrical box cover of the indoor unit of an air conditioner is a protective shell for the internal electrical components, serving to secure the wiring harness and circuit board of the indoor unit.

[0003] In the existing technology, when assembling the electrical box cover of an air conditioner indoor unit or other industries, it is necessary to manually position the electrical box cover to prevent it from shifting during the assembly process, and then assemble the other components with the electrical box cover.

[0004] The applicant has discovered that the prior art has at least the following technical problems: the existing manual positioning method for the electrical box cover has poor positioning effect, is time-consuming and labor-intensive, is difficult to operate, and has low assembly efficiency for the electrical box cover. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning fixture and an electrical box cover assembly line to solve the technical problems of poor positioning effect, time-consuming and labor-intensive operation, and high difficulty in the existing manual positioning method for electrical box covers. The various technical effects of the preferred technical solution among the many technical solutions provided by this utility model are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The positioning fixture provided by this utility model includes a base, a fixed plate assembly, a driving device, and a moving plate assembly, wherein:

[0008] The driving device and the fixed plate assembly are both fixed on the base, and all the fixed plate assemblies and all the movable plate assemblies cooperate to form a pre-set space for accommodating the workpiece.

[0009] The driving device is connected to the corresponding moving plate assembly and is used to move the moving plate assembly on the base so as to adjust the size of the preset space, and then cooperate with the fixed plate assembly to clamp and fix the workpiece from all sides.

[0010] Preferably, the number of fixing plate assemblies is at least two sets, one set of fixing plate assemblies is used to abut against a first side of the workpiece, and the other set of fixing plate assemblies is used to abut against a second side of the workpiece, wherein the first side and the second side are adjacent sides of the workpiece.

[0011] Preferably, the number of the movable plate assemblies is at least two sets, one set of the movable plate assemblies is used to abut against the third side of the workpiece, and the other set of the movable plate assemblies is used to abut against the fourth side of the workpiece, wherein the third side and the fourth side are adjacent sides of the workpiece.

[0012] Preferably, the driving device includes a first driving device and a second driving device, wherein:

[0013] The first driving device is fixed to the upper surface of the base and located outside the preset space. The first driving device is driven to be connected to one of the sets of moving plate assemblies.

[0014] The second driving device is fixed to the lower surface of the base and located below the preset space. A guide groove is provided on the base, which passes through the upper and lower surfaces of the base. The second driving device is driven to connect with another set of the moving plate assemblies, and the moving plate assemblies can move along the guide groove.

[0015] Preferably, the fixing plate assembly includes a fixing connecting plate and a limiting plate, wherein:

[0016] The fixed connecting plate is fixed to the base, and the limiting plate is fixed to the side of the fixed connecting plate facing the preset space. The limiting plate is made of soft material.

[0017] Preferably, the movable plate assembly includes a movable connecting plate and a pusher block, wherein:

[0018] The movable connecting plate is fixed to the telescopic end corresponding to the driving device, and the push block is fixed to the side of the movable connecting plate facing the preset space. The push block is made of soft material.

[0019] Preferably, the positioning fixture further includes a support block assembly, which is fixed to the base and located within the preset space. The support block assembly is used to extend into the inner cavity of the workpiece to support the workpiece flat. When the workpiece is supported on the support block assembly, the lower edge of the workpiece contacts the surface of the base.

[0020] Preferably, the support block assembly includes an adjustment plate and a support block, wherein:

[0021] The adjusting plate is fixed to the base, and the position of the adjusting plate on the base is adjustable along the X-axis.

[0022] The support block is fixed to the adjustment plate for directly supporting the workpiece, and the position of the support block on the adjustment plate is adjustable along the Y-axis.

[0023] Preferably, the base is provided with a first waist-shaped hole, and a locking member passes through the first waist-shaped hole to detachably and fix the base to the adjusting plate;

[0024] The adjustment plate is provided with a second waist-shaped hole, the length direction of the second waist-shaped hole is perpendicular to the length direction of the first waist-shaped hole, and another locking member passes through the second waist-shaped hole to detachably and fix the adjustment plate to the support block.

[0025] Preferably, a bracket is fixedly mounted on the base, the bracket is located within the preset space, and a detection sensor is fixedly mounted on the bracket for detecting whether the workpiece is placed in the preset space.

[0026] This utility model also provides an electrical box cover assembly line, including the above-mentioned positioning fixture.

[0027] The positioning fixture and electrical box cover assembly line provided by this utility model have the following advantages compared with the prior art: The workpiece is placed in the pre-set space, the fixed plate assembly is fixed on the base and abuts against one side of the workpiece, and the movable plate assembly moves under the drive of the driving device, thereby adjusting the size of the pre-set space. When the movable plate assembly moves to the position abutting against the other side of the workpiece, the movable plate assembly and the fixed plate assembly cooperate to clamp and position the workpiece from all sides, preventing the workpiece from moving forward, backward, left, or right. This positioning fixture, because the size of the pre-set space can be easily adjusted, facilitates the placement or removal of workpieces and can clamp and position electrical box covers of different models, thereby achieving the alignment of electrical box covers and improving the subsequent assembly efficiency of electrical box covers. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural schematic diagram of the positioning tool of this utility model from the upper view.

[0030] Figure 2 This is a structural schematic diagram of the positioning fixture from the bottom view of this utility model;

[0031] Figure 3 This is a schematic diagram of the positioning fixture clamping and positioning the electrical box cover.

[0032] In the diagram: 100, electrical box cover; 200, fixed plate assembly; 300, movable plate assembly; 400, preset space; 1, base; 101, guide groove; 102, first oblong hole; 2, first driving device; 3, first movable connecting plate; 4, first push block; 5, second driving device; 6, second movable connecting plate; 7, second push block; 8, first fixed connecting plate; 9, first limiting plate; 10, second fixed connecting plate; 11, second limiting plate; 12, adjusting plate; 121, second oblong hole; 13, support block; 14, detection sensor; 15, bracket. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] This utility model provides a positioning fixture and an electrical box cover assembly line. Since the size of the preset space can be easily adjusted, it is convenient to place or remove workpieces, and it can clamp and position electrical box covers of different models, thereby realizing the alignment of electrical box covers and improving the subsequent assembly efficiency of electrical box covers.

[0036] The following combination Figure 1-Figure 3 The technical solution provided by this utility model will be described in more detail.

[0037] Example 1:

[0038] See Figure 1-Figure 3As shown, the positioning fixture provided by this utility model includes a base 1, a fixed plate assembly 200, a driving device, and a movable plate assembly 300. The driving device and the fixed plate assembly 200 are fixed on the base 1. All the fixed plate assemblies 200 and all the movable plate assemblies 300 cooperate to form a preset space 400 for accommodating the workpiece. The driving device is driven to the corresponding movable plate assembly 300 and is used to move the movable plate assembly 300 on the base 1 to adjust the size of the preset space 400. Then, it cooperates with the fixed plate assembly 200 to clamp and fix the workpiece from all sides.

[0039] The base 1 can be a block structure or a plate structure, and the base 1 is fixed on the table or the frame.

[0040] In this embodiment, the positioning fixture places the workpiece into a preset space 400. A fixed plate assembly 200 is fixed to the base 1 and abuts against one side of the workpiece. A movable plate assembly 300 moves under the drive of a driving device, thereby adjusting the size of the preset space 400. When the movable plate assembly 300 moves to abut against the other side of the workpiece, it cooperates with the fixed plate assembly 200 to clamp and position the workpiece from all sides, preventing it from moving forward, backward, left, or right. By pre-positioning the workpiece using the fixed plate assembly 200—that is, positioning at least two sides of the workpiece such as the electrical box cover 100 first—and then using the movable plate assembly 300 to move towards the corresponding fixed plate assembly 200 to position the remaining sides of the workpiece, thus clamping it, the workpiece can be quickly positioned, eliminating the need for repeated adjustments.

[0041] This positioning fixture, with its adjustable pre-set space of 400, facilitates the placement or removal of workpieces and can clamp and position different models of electrical box covers 100, thereby achieving the alignment of electrical box covers 100 and improving the subsequent assembly efficiency of electrical box covers 100.

[0042] Specifically, in this embodiment, the movable plate assembly 300 can be one or at least two sets, and the fixed plate assembly 200 can be one or at least two sets. There is a set of movable plate assemblies 300 and a set of fixed plate assemblies 200 arranged opposite to each other. The movable plate assembly 300 can move away from or towards the corresponding fixed plate assembly 200, thereby adjusting the size of the preset space 400.

[0043] The movable plate assembly 300 and the fixed plate assembly 200 work together to clamp and fix the workpiece from all four sides. That is, the movable plate assembly 300 and the fixed plate assembly 200 can prevent the workpiece from shifting in four directions: front, back, left and right, thus improving the positioning effect of the workpiece.

[0044] In this embodiment, the workpiece is an electrical box cover 100 as an example for explanation.

[0045] The size of the preset space 400 can be adjusted at any time by driving the moving plate assembly 300 through the drive device. This method is convenient to operate and is applicable to different types of electrical box covers 100 and other workpieces. It eliminates the need to install and remove the fixing plate assembly 200 or fix the fixing plate assembly 200 in different positions to position different workpieces.

[0046] As an alternative implementation, see [link to implementation details]. Figure 1-Figure 3 As shown, there are at least two sets of fixing plate assemblies 200, one set of fixing plate assemblies 200 abutting against the first side of the workpiece, and the other set of fixing plate assemblies 200 abutting against the second side of the workpiece. The first side and the second side are adjacent sides of the workpiece.

[0047] The fixed plate assembly 200 pre-positions the workpiece position by at least two sides of the workpiece such as the electrical box cover 100, so that the movable plate assembly 300 can clamp and fix the workpiece after moving into place.

[0048] As an alternative implementation, see [link to implementation details]. Figure 1-Figure 3 As shown, there are at least two sets of movable plate assemblies 300, one set of movable plate assemblies 300 is used to abut against the third side of the workpiece, and the other set of movable plate assemblies 300 is used to abut against the fourth side of the workpiece, wherein the third side and the fourth side are adjacent sides of the workpiece.

[0049] Each set of movable plate assembly 300 can move toward or away from the fixed plate assembly 200 opposite to it, and can be used with electrical box covers 100 of different models.

[0050] Specifically, the first and third sides of the workpiece are opposite sides, and the second and fourth sides of the workpiece are opposite sides. One set of movable plate assemblies 300 and fixed plate assemblies 200 are located on the first and third sides of the workpiece, respectively, and another set of movable plate assemblies 300 and fixed plate assemblies 200 are located on the second and fourth sides of the workpiece, respectively. The first and second sides of the workpiece are first pre-positioned by the fixed plate assembly 200. The two sets of movable plate assemblies 300 move accordingly, thereby cooperating with the fixed plate assembly 200, and the four sides of the workpiece restrict the front, back, left and right offset of the workpiece.

[0051] For rectangular workpieces, such as the electrical box cover 100 in this embodiment, the fixed plate assembly 200 is located on the adjacent long and short sides of the workpiece and abuts against the adjacent long and short sides of the workpiece, and the movable plate assembly 300 is located on the other adjacent long and short sides of the workpiece and abuts against the other set of adjacent long and short sides of the workpiece.

[0052] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 2As shown, the driving device includes a first driving device 2 and a second driving device 5, wherein: the first driving device 2 is fixed to the upper surface of the base 1 and located outside the preset space 400, and the first driving device 2 is drivenly connected to one of the sets of movable plate assemblies 300; see also Figure 1 As shown, the first drive device 2 can be a pneumatic cylinder, an electric cylinder, a hydraulic cylinder, or a linear servo module, etc. The first drive device 2 is located on the upper surface of the base 1 and outside the preset space 400, and does not occupy the preset space 400.

[0053] See Figure 1 and Figure 2 As shown, the second driving device 5 is fixed to the lower surface of the base 1 and located below the preset space 400. A guide groove 101 is provided on the base 1, which passes through the upper and lower surfaces of the base 1. The second driving device 5 is driven to connect with another set of movable plate assemblies 300, and the movable plate assemblies 300 can move along the guide groove 101.

[0054] Similarly, the second drive device 5 can be a pneumatic cylinder, an electric cylinder, a hydraulic cylinder, or a linear servo module, etc. The second drive device 5 is located at the lower part of the base 1, does not occupy the space of the upper part of the base 1, and is located below the preset space 400. This arrangement makes the overall structure more compact, reduces the footprint of the base 1, and does not occupy the preset space 400.

[0055] The guide groove 101 enables the connection between the second drive device 5 and the moving plate assembly 300. Even if the second drive device 5 and the moving plate assembly 300 are located on the upper and lower sides of the base 1, the transmission connection between the two can still be achieved.

[0056] In this embodiment, the first driving device 2 is a dual-axis cylinder. The stroke of the dual-axis cylinder must meet the maximum and minimum dimensions of the width of the cover 100 of different models of electrical boxes.

[0057] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 3 As shown, the number of fixing plate assemblies 200 is at least two sets. One set of fixing plate assemblies includes a first fixing connecting plate 8 and a first limiting plate 9. The first fixing connecting plate 8 is fixed to the base 1, and the first limiting plate 9 is fixed to the side of the first fixing connecting plate 8 facing the preset space 400. The other set of fixing plate assemblies includes a second fixing connecting plate 10 and a second limiting plate 11. The second fixing connecting plate 10 is fixed to the base 1, and the second limiting plate 11 is fixed to the side of the second fixing connecting plate 10 facing the preset space 400. The first limiting plate 9 and the second limiting plate 11 are both made of soft material.

[0058] The first fixed connecting plate 8 and the second fixed connecting plate 10 are fixed to the base 1 by screws or other locking devices. To improve structural strength and prevent deformation of the fixed plate assembly 200, the fixed connecting plates are made of a rigid material, such as metal. The limiting plate is made of polyurethane or similar material. The limiting plate is in direct contact with the electrical box cover 100 and other workpieces, preventing scratches on the appearance of the electrical box cover 100 and other workpieces, thus protecting the workpieces.

[0059] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 3 As shown, there are at least two sets of movable plate assemblies 300. One set of movable plate assemblies includes a first movable connecting plate 3 and a first push block 4. The first movable connecting plate 3 is fixed to the telescopic end of the first driving device, and the first push block 4 is fixed to the side of the first movable connecting plate 3 facing the preset space 400. The other set of movable plate assemblies includes a second movable connecting plate 6 and a second push block 7. The second movable connecting plate 6 is fixed to the telescopic end of the second driving device, and the second push block 7 is fixed to the side of the second movable connecting plate 6 facing the preset space 400. The first push block 4 and the second push block 7 are both made of soft material.

[0060] Similarly, the first movable connecting plate 3 and the second movable connecting plate 6 are fixed to the base 1 by screws or other locking devices. To improve structural strength and prevent deformation of the movable plate assembly 300, the movable connecting plates are made of a rigid material, such as metal. The push block is made of polyurethane or similar material. The push block is in direct contact with the electrical box cover 100 and other workpieces, preventing scratches on the appearance of the electrical box cover 100 and other workpieces, thus protecting the workpieces.

[0061] Example 2:

[0062] For some workpieces with internal cavities, such as the electrical box cover 100, when the electrical box cover 100 is located in the preset space 400, the workpiece is prone to tilting when the moving plate assembly 300 abuts against the workpiece, affecting the workpiece positioning.

[0063] For the above issues, please refer to Figure 1 and Figure 3 As shown, the positioning fixture in this embodiment also includes a support block 13 assembly. The support block 13 assembly is fixed on the base 1 and located in the preset space 400. The support block 13 assembly is used to extend into the inner cavity of the workpiece to support the workpiece flat. When the workpiece is supported on the support block 13 assembly, the lower edge of the workpiece contacts the surface of the base 1.

[0064] When the electrical box cover 100 (workpiece) is placed inside the pre-set space 400, the support block 13 assembly extends into the inner cavity of the workpiece to flatly support the electrical box cover 100. The lower edge of the side wall of the electrical box cover 100 contacts the surface of the base 1 to prevent the electrical box cover 100 from tilting up. The support block 13 serves as a pre-positioning mechanism. When the electrical box cover 100 and other workpieces are engaged with the support block 13, at least two sides of the electrical box cover 100 and other workpieces abut against the corresponding fixing plate assembly 200.

[0065] The aforementioned support block 13 component can be universally used to support and flatten electrical box covers 100 of different models.

[0066] As an alternative implementation, see [link to implementation details]. Figure 1 and Figure 3 As shown, the support block 13 assembly includes an adjusting plate 12 and a support block 13. The adjusting plate 12 is fixed to the base 1, and its position on the base 1 is adjustable along the X-axis. The support block 13 is fixed to the adjusting plate 12 for directly supporting the workpiece, and its position on the adjusting plate 12 is adjustable along the Y-axis. The support block 13 can be made of POM material to prevent scratching plastic workpieces such as the electrical box cover 100.

[0067] Among them, "X-axis direction" and "Y-axis direction" refer to the length direction of base 1 and the width direction of base 1, respectively.

[0068] The support block 13 can be adjusted in position along the X-axis and Y-axis directions on the base 1, thereby adjusting the relative position of the electrical box cover 100 in the preset space 400. This ensures that after the electrical box cover 100 and the support block 13 are in place, at least two sides of the electrical box cover 100 abut against the fixing plate assembly 200, and can be used to support and flatten electrical box covers 100 of different models.

[0069] As an alternative implementation, see [link to implementation details]. Figure 2 As shown, the base 1 has a first oblong hole 102 extending along the X-axis. A locking member passes through the first oblong hole 102 to detachably and securely connect the base 1 to the adjusting plate 12. The locking member can be a screw, etc. By passing the screw through different positions of the first oblong hole 102, the adjusting plate 12 can be locked in different positions on the base 1. Loosening the locking member allows adjustment of the position of the adjusting plate 12 in the X-axis direction on the base 1.

[0070] See Figure 1As shown, the adjusting plate 12 is provided with a second oblong hole 121. The length direction of the second oblong hole 121 is perpendicular to the length direction of the first oblong hole 102, that is, the second oblong hole 121 extends along the Y-axis. Another locking member passes through the second oblong hole 121 to detachably fix the adjusting plate 12 and the support block 13. This locking member can be a screw, etc. By passing the screw through different positions of the second oblong hole 121, the support block 13 is locked in different positions on the adjusting plate 12. Loosening the locking member can adjust the position of the support block 13 in the Y-axis direction on the adjusting plate 12.

[0071] As an alternative implementation, see [link to implementation details]. Figure 1 As shown, a bracket 15 is fixedly installed on the base 1. The bracket 15 is located in the preset space 400. A detection sensor 14 is fixed on the bracket 15 to detect whether the workpiece is placed in the preset space 400.

[0072] The detection sensor 14 can be a reflective sensor or a limit switch, etc. The positioning fixture also includes a control unit, which is electrically connected to the detection sensor 14 and the drive device. When the control unit receives a signal that the workpiece has been placed in the preset space 400, it controls the drive device to move, so that the moving plate assembly 300 moves toward the corresponding fixed plate assembly 200, thereby clamping and fixing the workpiece from all sides.

[0073] The above structure improves the automation level of the positioning tooling and makes it easier to use.

[0074] Example 3:

[0075] This embodiment provides an electrical box cover assembly line, including the aforementioned positioning fixture.

[0076] The electrical box cover assembly line in this embodiment uses positioning fixtures to achieve precise pre-positioning of the electrical box cover 100, laying the foundation for fully automated assembly of the indoor unit's electrical box cover 100. The positioning fixtures, in conjunction with automatic feeding and robotic clamps, enable the fully automated assembly function of the electrical box cover 100.

[0077] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A positioning fixture, characterized in that, Includes a base, a fixed plate assembly, a drive unit, and a movable plate assembly, wherein: The driving device and the fixed plate assembly are both fixed on the base, and all the fixed plate assemblies and all the movable plate assemblies cooperate to form a pre-set space for accommodating the workpiece. The driving device is connected to the corresponding moving plate assembly and is used to move the moving plate assembly on the base so as to adjust the size of the preset space, and then cooperate with the fixed plate assembly to clamp and fix the workpiece from all sides.

2. The positioning fixture according to claim 1, characterized in that, The number of fixing plate assemblies is at least two sets, one set of fixing plate assemblies is used to abut against a first side of the workpiece, and the other set of fixing plate assemblies is used to abut against a second side of the workpiece, wherein the first side and the second side are adjacent sides of the workpiece.

3. The positioning fixture according to claim 1 or 2, characterized in that, The number of movable plate assemblies is at least two sets, one set of movable plate assemblies is used to abut against the third side of the workpiece, and the other set of movable plate assemblies is used to abut against the fourth side of the workpiece, wherein the third side and the fourth side are adjacent sides of the workpiece.

4. The positioning fixture according to claim 3, characterized in that, The driving device includes a first driving device and a second driving device, wherein: The first driving device is fixed to the upper surface of the base and located outside the preset space. The first driving device is driven to be connected to one of the sets of moving plate assemblies. The second driving device is fixed to the lower surface of the base and located below the preset space. A guide groove is provided on the base, which passes through the upper and lower surfaces of the base. The second driving device is driven to connect with another set of the moving plate assemblies, and the moving plate assemblies can move along the guide groove.

5. The positioning fixture according to claim 1 or 2, characterized in that, The fixing plate assembly includes a fixing connecting plate and a limiting plate, wherein: The fixed connecting plate is fixed to the base, and the limiting plate is fixed to the side of the fixed connecting plate facing the preset space. The limiting plate is made of soft material.

6. The positioning fixture according to claim 1, characterized in that, The movable plate assembly includes a movable connecting plate and a pusher block, wherein: The movable connecting plate is fixed to the telescopic end corresponding to the driving device, and the push block is fixed to the side of the movable connecting plate facing the preset space. The push block is made of soft material.

7. The positioning fixture according to claim 1, characterized in that, The positioning fixture also includes a support block assembly, which is fixed on the base and located within the preset space. The support block assembly is used to extend into the inner cavity of the workpiece to support the workpiece flat. When the workpiece is supported on the support block assembly, the lower edge of the workpiece contacts the surface of the base.

8. The positioning fixture according to claim 7, characterized in that, The support block assembly includes an adjustment plate and a support block, wherein: The adjusting plate is fixed to the base, and the position of the adjusting plate on the base is adjustable along the X-axis. The support block is fixed to the adjustment plate for directly supporting the workpiece, and the position of the support block on the adjustment plate is adjustable along the Y-axis.

9. The positioning fixture according to claim 8, characterized in that, The base is provided with a first waist-shaped hole, the length direction of the first waist-shaped hole extends along the X-axis direction, and a locking member passes through the first waist-shaped hole to detachably and fix the base to the adjusting plate. The adjustment plate is provided with a second waist-shaped hole, the length direction of the second waist-shaped hole is perpendicular to the length direction of the first waist-shaped hole, and another locking member passes through the second waist-shaped hole to detachably and fix the adjustment plate to the support block.

10. The positioning fixture according to claim 1 or 7, characterized in that, A bracket is fixedly installed on the base, and the bracket is located within the preset space. A detection sensor is fixed on the bracket to detect whether the workpiece is placed in the preset space.

11. An electrical appliance box cover assembly line, characterized in that, Includes the positioning fixture described in any one of claims 1-10.

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