Pressure head device and installation method of power module cover plate

Abstract

The invention belongs to the technical field of power module assembly, and particularly relates to a pressure head device and an installation method of a power module cover plate, the pressure head device comprises a guide plate, four sub pressure heads, four spiral sliding rails and four driving mechanisms, the four spiral sliding rails are arranged on the guide plate in a matrix distribution mode, and every two adjacent spiral sliding rails are symmetrically arranged; the four sub-pressure heads are correspondingly arranged in the four spiral sliding rails in a sliding mode, the four driving mechanisms are used for correspondingly driving the four sub-pressure heads to move along the spiral sliding rails where the sub-pressure heads are located, after the four sub-pressure heads move, every two adjacent sub-pressure heads are symmetrical in the corresponding spiral sliding rails, and when a target press-fitting piece is pressed, the sub-pressure heads are located in the corresponding spiral sliding rails. And the four sub pressure heads synchronously move towards the target press-fitting piece. The cover plate mounting device can adapt to various cover plates with different surface structures and is high in compatibility, the automation degree of the cover plate mounting procedure is improved, pressure output is uniform, and the cover plate mounting quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power module assembly, and in particular relates to a pressure head device and a method for installing a power module cover plate. Background Art

[0002] In the packaging structure of the power module, the tube shell and the cover plate are generally fixed by buckles, and in the packaging process of the power module, the cover plate is generally pressed by driving the pressure head structure downward to make it snap into place with the tube shell. In order to ensure that each buckle between the cover plate and the tube shell can be snapped into place, while avoiding the position of the terminal on the product liner, the pressure head structure in the current prior art is generally a single fixed shape design adapted to a specific model of power module, which limits its application in multi-directional pressure stable output and precise control. However, since the terminal positions of different models of power module products are different, in order to meet the packaging requirements of different models of power module products, the cover plate installation process in the existing packaging production line needs to design different shapes of pressure heads for backup. When switching the required packaged product, the pressure head structure needs to be manually replaced, which is troublesome to operate and will limit the degree of automation of the cover plate installation process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a pressure head device and a power module cover plate installation method that are adaptable to a variety of cover plates with different surface structure designs, have high compatibility, improve the degree of automation of the cover plate installation process, and have uniform pressure output to improve the installation quality of the cover plate.

[0004] The content of the present invention provides a pressing head device, including a guide plate, four sub-pressing heads, four spiral slide rails and four driving mechanisms. The four spiral slide rails are arranged on the guide plate in a matrix distribution, and the spiral slide rails adjacent to each other are symmetrically arranged. The four sub-pressing heads are correspondingly slidably arranged in the four spiral slide rails. The four driving mechanisms are used to correspondingly drive the four sub-pressing heads to move along the spiral slide rails where they are located. After the four sub-pressing heads move, the positions of the two adjacent sub-pressing heads in their corresponding spiral slide rails are symmetrical. When pressure is applied to the target pressed part, the four sub-pressing heads move toward the target pressed part synchronously.

[0005] Furthermore, each of the four sub-pressing heads is provided with a pressure sensing unit for detecting the pressure of the sub-pressing head when applying pressure to the target press-fitted part.

[0006] Furthermore, the four sub-pressing heads are each provided with a connecting piece, and the four sub-pressing heads are connected to four driving mechanisms through corresponding connecting pieces. The sub-pressing heads can move axially relative to the connecting pieces or the connecting pieces are a retractable structure. The connecting pieces are each provided with a spring, and one end of the spring abuts against the sub-pressing head.

[0007] Furthermore, the guide plate is provided with four spiral through grooves, and the four spiral through grooves correspond to four spiral slide rails. The four sub-pressing heads are located on one side of the guide plate, and one end of the connecting pieces of the four sub-pressing heads is provided with a matching boss, and the matching boss is slidably passed through the corresponding spiral slide rails. One end of the spring is abutted against the matching boss on the sub-pressing head, and the four driving mechanisms are located on the other side of the guide plate.

[0008] Furthermore, the single driving mechanism includes a rotary driving component, a matching plate, a rotating block and a moving block, the rotating block is arranged on the surface of the matching plate and rotates with the matching plate, the matching plate surface is provided with a curved slide groove around the rotating cooperation, the moving block slides with the rotating block along the length direction of the rotating block, and the bottom of the rotating block is provided with a strip through groove extending along its own length direction, the bottom of the moving block is provided with a positioning piece, the positioning piece passes through the strip through groove and is located in the curved slide groove, and the end of the connecting piece facing away from the ion pressure head is connected to the moving block; the rotary driving component drives the rotating block and the matching plate to rotate relative to each other, the moving block moves in the curved slide groove through the positioning piece and slides in a straight line along the rotating piece, thereby driving the sub-pressure head to move along the spiral slide rail.

[0009] Furthermore, the rotating block is provided with a wedge-shaped slide groove extending along its length direction, the strip-shaped through groove is connected with the wedge-shaped slide groove, and the bottom of the moving block is provided with a wedge-shaped block, which is located in the wedge-shaped slide groove.

[0010] Furthermore, the sub-pressing head is made of plastic, and the end surface diameter of the sub-pressing head is 5 mm.

[0011] The present invention also provides a method for installing a power module cover plate, the method using the above-mentioned pressing head device and comprising the following steps: S1. Identify the type of target cover plate to be installed, and according to the optimal pressure position preset by the type information of the target cover plate, drive four sub-pressing heads to move in corresponding spiral slide rails through four driving mechanisms, so that the positions of the four sub-pressing heads correspond to the optimal pressure position of the target cover plate; S2. Drive the four sub-pressing heads to press down simultaneously to apply pressure to the target cover plate, so as to press the target cover plate to engage with the corresponding tube shell.

[0012] Furthermore, in S1, the type of the target cover plate to be installed is identified by the power module product identification code or the barcode of the power module tray.

[0013] Furthermore, when each of the four sub-pressure heads is provided with a pressure sensing unit, in S2, when the four sub-pressure heads are pressed down simultaneously to apply pressure to the target cover plate, the pressure sensing units on the four sub-pressure heads detect the pressure values ​​in real time and feed back the pressure values ​​to the control system, and the control system determines whether the pressures of the four sub-pressure heads are consistent and gives corresponding prompts.

[0014] The beneficial effect of the present invention is that, according to the different target cover plates, four driving mechanisms are used to correspondingly drive four sub-pressing heads to move along the corresponding spiral slide rails to avoid the uneven areas and terminal holes on the target cover plates. The spiral tracks combined with the movement of the four sub-pressing heads can cover most of the positions on the surface of the cover plates, thereby adapting to a variety of cover plates with different surface structure designs. It has high compatibility and does not require frequent manual replacement of the press head structure when switching the required packaged products, which simplifies the model change operation process, improves the model change switching efficiency, and improves the degree of automation of the cover plate installation process.

[0015] By having four sub-pressure heads acting on the surface of the cover plate at the same time, the positions of two adjacent sub-pressure heads in their corresponding spiral slide rails are symmetrical, which can form pressure output at four points evenly distributed on the surface of the cover plate, so that the four corners of the cover plate are pressurized evenly and stably, and can avoid the situation where the cover plate is warped or partially not locked after installation due to uneven pressure, thereby improving the installation quality of the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the first viewing angle of the pressure head device of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the pressure head device of the present invention after the guide plate is removed.

[0018] Figure 3 It is a schematic structural diagram of the pressure head device from a second viewing angle of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the pressure head device of the present invention from a third viewing angle.

[0020] In the figure: 1. guide plate; 11. spiral slide rail; 2. pressure head; 21. matching boss; 3. driving mechanism; 31. matching plate; 311. curved slide groove; 32. rotating block; 321. wedge-shaped slide groove; 322. strip through groove; 33. moving block; 331. wedge-shaped block; 34. transmission gear 1; 35. driving gear 1; 36. transmission gear 2; 37. driving gear 2; 38. mounting plate; 4. connecting piece; 5. spring. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 4As shown, the present invention provides a pressing head device, which includes a guide plate 1, four sub-pressing heads 2, four spiral slides 11 and four driving mechanisms 3. The four spiral slides 11 are arranged on the guide plate 1 in a matrix distribution, and the spiral slides 11 adjacent to each other in the length or width direction of the matrix are symmetrically arranged, and the two spiral slides 11 in the diagonal direction of the matrix are centrally symmetrically arranged. The four sub-pressing heads 2 are slidably arranged in the four spiral slides 11 one by one, and the four driving mechanisms 3 are used to correspondingly drive the four sub-pressing heads 2 to move along the spiral slides 11 where they are located. The spiral slides 11 are used to guide and position the movement of the sub-pressing heads 2 to ensure that the movement of the sub-pressing heads 2 is a stable spiral trajectory. After the four sub-pressing heads 2 move, the positions of the two adjacent sub-pressing heads 2 in their corresponding spiral slides 11 are symmetrical. When the target press-fitted part is pressed, the four sub-pressing heads 2 move synchronously toward the target press-fitted part. When the cover plate for the power module is installed, the target press-fitted part is the target cover plate to be installed.

[0022] When the pressure head device provided by the present invention is applied to the installation of the cover plate, according to the different target cover plates, four sub-pressure heads 2 are correspondingly driven by four driving mechanisms 3 to move along the corresponding spiral slide rails 11 to avoid the uneven areas and terminal holes on the target cover plate. The spiral tracks of the movement of the four sub-pressure heads 2 can cover most of the positions on the surface of the cover plate, thereby adapting to a variety of cover plates with different surface structure designs, greatly improving the applicability of the pressure head device, with high compatibility. When switching the required packaged products, there is no need to frequently manually replace the pressure head structure, simplifying the model change operation process, improving the model change switching efficiency, and improving the degree of automation of the cover plate installation process. Through the four sub-pressure heads 2 acting on the cover plate surface at the same time, the positions of the two adjacent sub-pressure heads 2 in their corresponding spiral slide rails 11 are symmetrical, and the pressure output of four points evenly distributed on the cover plate surface can be formed, so that the four corners of the cover plate are evenly and stably pressurized, and the situation that the cover plate has warped corners or partially not engaged after installation due to uneven pressure can be avoided, thereby improving the installation quality of the cover plate.

[0023] The four sub-pressing heads 2 are all provided with pressure sensing units for detecting the pressure of the sub-pressing heads 2 when applying pressure to the cover plate. The pressure sensing units are specifically pressure sensors, which are all electrically connected to the control system, and are used to detect the pressure value in real time and feed it back to the control system. The control system determines the consistency of the pressure when the four sub-pressing heads 2 are used and monitors it, and issues an alarm prompt when it is inconsistent, so that the operator can make corrections and adjustments in time to ensure the levelness of the four sub-pressing heads 2 and the consistency of the pressure when applying pressure.

[0024] The four sub-pressing heads 2 are all provided with connecting parts 4, and the four sub-pressing heads 2 are connected to the four driving mechanisms 3 through the corresponding connecting parts 4. The sub-pressing heads 2 can move axially relative to the connecting parts 4 or the connecting parts 4 are retractable structures. The former is that one end of the connecting part 4 is axially inserted into the sub-pressing head 2, so that the sub-pressing head 2 can move axially relative to the connecting part 4, and the end of the connecting part 4 is provided with a limiting platform to limit the axial movement stroke to ensure that the connecting part 4 and the sub-pressing head 2 will not be separated. The latter is that the connecting part 4 is a telescopic rod structure. The connecting parts 4 are all sleeved with springs 5, one end of the spring 5 is in contact with the sub-pressing head 2, and the other end is fixed to the connecting part 4 or fixed by other positioning parts. Based on the setting of the spring 5, a certain elastic force can be generated when the sub-pressing head 2 is over-pressed, so that the sub-pressing head 2 enters an over-pressure protection state to prevent the over-pressure force from directly acting on the cover plate and damaging the cover plate.

[0025] The guide plate 1 is provided with four spiral through grooves, and the four spiral through grooves correspond to four spiral slide rails 11, and the spiral slide rails 11 are specifically circular spiral-shaped. The four sub-pressing heads 2 are located on one side of the guide plate 1, and one end of the four sub-pressing heads 2 is provided with a matching boss 21, and the matching boss 21 is slidably inserted into the corresponding spiral slide rail 11, and one end of the spring 5 is specifically abutted against the matching boss 21 on the sub-pressing head 2, and the four driving mechanisms 3 are located on the other side of the guide plate 1. Based on this embodiment, the setting of the spiral slide rail 11 and the sliding matching structure with the sub-pressing head 2 are simpler, and the driving method and installation restrictions of the driving mechanism 3 are smaller.

[0026] In order to ensure the integrity of the pressure head device, the pressure head device can be provided with a mounting seat, four driving mechanisms 3 are arranged in the mounting seat, and the guide plate 1 is fixed to the mounting seat.

[0027] The single driving mechanism 3 includes a rotating driving assembly, a matching plate 31, a rotating block 32 and a moving block 33. The rotating block 32 is located on the surface of the matching plate 31, and the bottom of one end of the rotating block 32 is rotatably matched with the matching plate 31 through a rotating shaft. The place where the rotating shaft is passed through is the rotational matching place of the two. A curved sliding groove 311 is provided on the surface of the matching plate 31 around the place where the rotating shaft is passed through. The direction from one end of the rotating block 32 that is rotatably matched with the matching plate 31 to the other end is the length direction of the rotating block 32. The moving block 33 is slidably matched with the rotating block 32 along the length direction of the rotating block 32, and a strip through groove 322 is provided through the bottom of the rotating block 32, and the length of the strip through groove 322 extends along the length direction of the rotating block 32. A positioning piece is provided at the bottom of the moving block 33, and the positioning piece passes through the strip through groove 322 and extends into the curved slide groove 311. The end of the connecting piece 4 facing away from the ion pressure head 2 is connected to the moving block 33; the rotating drive assembly drives the rotating block 32 to rotate relative to the matching plate 31 along the surface of the matching plate 31 in the shape of a lever, and the moving block 33 moves in the curved slide groove 311 through the positioning piece and slides linearly along the rotating piece, thereby driving the sub-pressure head 2 to move along the spiral slide rail 11.

[0028] In one embodiment of the present invention, when the rotating block 32 rotates relative to the matching plate 31, the matching plate 31 remains stationary, and the rotating block 32 rotates around its rotation axis. In this embodiment, the curve of the curved slide 311 is a spiral line corresponding to the shape of the spiral slide rail 11. The rotating drive member is a power module, which is a motor or other rotating drive structure, which directly drives the rotating block 32 to rotate through the rotating shaft, and the matching plate 31 is fixedly set on the mounting seat.

[0029] In another embodiment of the present invention, when the rotating block 32 and the matching plate 31 rotate relative to each other, the matching plate 31 and the rotating block 32 both rotate, and the matching plate 31 and the rotating block 32 rotate at different speeds, forming a differential relative rotation. In this embodiment, the curve of the curved slide 311 is a curve extending in a spiral trend, that is, Figure 2As shown. This embodiment realizes the spiral movement trajectory of the sub-pressing block through the differential relative rotation of the matching plate 31 and the rotating block 32, and has higher stability. Preferably, the rotating drive member includes two sets of gear sets, one of which includes a transmission gear 1 34 and a driving gear 1 35 that mesh with each other, and the other set includes a transmission gear 2 36 and a driving gear 2 37 that mesh with each other. The transmission gear 1 34 and the driving gear 1 35 are both rotatably arranged on the mounting plate 38, and the transmission gear 2 36 is coaxially rotatably arranged on the transmission gear 1 34. The transmission gear 2 36 and the transmission gear 1 34 can rotate relative to each other, and the rotation axes of the two are on the same straight line. The matching plate 31 is fixedly arranged on the transmission gear 2 36, and the rotating shaft of the moving block 33 passes through the matching plate 31 and the transmission gear 2 36 and is fixed with the transmission gear 1 34, and the moving block 33 rotates following the transmission gear 1 34. The driving gear 2 37 is coaxially fixedly arranged on the driving gear 1 35, and the driving gear 2 37 rotates following the driving gear 1 35, and the rotation axis is located on the same straight line. The diameter and number of teeth of the transmission gear 1 34 and the transmission gear 2 36 are different, and the diameter and number of teeth of the drive gear 1 35 and the drive gear 2 37 are different. When the drive gear 1 35 and the drive gear 2 37 rotate, the transmission gear 1 34 and the transmission gear 2 36 are driven to rotate at different speeds, thereby realizing the relative rotation of the rotating block 32 and the matching plate 31 at different speeds. Based on this setting, the drive gear 1 35 and the drive gear 2 37 in a single drive mechanism 3 can be driven to rotate by the same power module. Among them, the mounting plate 38 is fixedly arranged on the mounting seat, and the power module can be installed on the mounting plate 38 or on the mounting seat, and the power module can be a motor or other rotating drive module.

[0030] The sliding cooperation structure of the rotating block 32 and the moving block 33 is specifically as follows: a wedge-shaped slide groove 321 is provided on the rotating block 32, and the wedge-shaped slide groove 321 is a slide groove with a wedge-shaped end face. The length direction of the wedge-shaped slide groove 321 extends along the length direction of the rotating block 32, and the strip-shaped through groove 322 is connected to the wedge-shaped slide groove 321. A wedge block 331 is provided at the bottom of the moving block 33, and the wedge block 331 is located in the wedge-shaped slide groove 321, that is, the corresponding sliding cooperation is achieved through the cooperation between the wedge block 331 and the wedge-shaped slide groove 321. This cooperation method is simple and can play a role of limiting in the vertical direction, thereby ensuring the reliability of its cooperation structure.

[0031] The sub-pressing head 2 is made of plastic, which has a certain hardness to ensure a good service life and avoid damage to the surface of the cover. The end diameter of the sub-pressing head 2 is preferably 5mm, which ensures that it can flexibly avoid the uneven area and pin holes on the cover while providing sufficient pressing contact area.

[0032] In the present invention, when the cover plate is pressed down by the four sub-pressing heads 2, the pressing head device moves as a whole. When in use, the pressing head device is mounted on the pressing drive device in the cover plate installation station for use. The pressing drive device is electrically connected to the control system, and the pressing height of the pressing head device is preset and controlled by the control system. In the pressing head device, the power modules in the four driving mechanisms 3 are all electrically connected to the control system, and corresponding coordinated control is performed by the control system.

[0033] The present invention also provides a method for installing a power module cover plate, the method using the above-mentioned pressing head device and comprising the following steps: S1, identifying the type of target cover plate to be installed, and according to the optimal pressure position preset by the type information of the target cover plate, driving four sub-pressing heads 2 to move in corresponding spiral slide rails 11 through four driving mechanisms 3, so that the positions of the four sub-pressing heads 2 correspond to the optimal pressure positions of the target cover plate; S2, driving the four sub-pressing heads 2 to press down simultaneously to apply pressure to the target cover plate, so as to press the target cover plate to engage with the corresponding tube shell.

[0034] The installation method of the power module cover provided by the present invention can drive four sub-pressing heads 2 to move to the preset optimal position along the corresponding spiral slide rail 11 through four driving mechanisms 3 according to the type information of the identified target cover, avoiding the uneven area and terminal hole position on the target cover, with high compatibility. When switching the required packaged products, there is no need to frequently manually replace the press head structure, simplifying the type change operation process, improving the type change switching efficiency, and improving the automation degree of the cover installation process. And it can form pressure output at four points evenly distributed on the surface of the cover, so that the four corners of the cover are evenly and stably pressed, and the installation quality of the cover is improved.

[0035] In S1, the type of the target cover plate to be installed is identified by the power module product identification code or the barcode of its pallet. The pallet is the pallet used by the production line to support the corresponding structural parts to be installed when the power module is installed, and the identification tool is a barcode / identification code scanner or a visual system.

[0036] When pressure sensing units are provided on all four sub-pressing heads 2, in said S2, when the four sub-pressing heads 2 are pressed down at the same time to apply pressure to the target cover plate, the pressure sensing units on the four sub-pressing heads 2 detect the pressure value in real time and feed it back to the control system, and the control system determines whether the pressure of the four sub-pressing heads 2 is consistent, and issues an alarm prompt when it is inconsistent, so that the operator can make corrections and adjustments in time, ensure the horizontality of the four sub-pressing heads 2 and the consistency of pressure when applying pressure, thereby further ensuring the installation quality of the cover plate. Among them, the judgment of pressure consistency can preset a certain error range, and when the pressure difference of the four sub-pressing heads 2 is within the error range, the pressure is deemed to be consistent.

[0037] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0038] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A pressure head device, characterized in that: The invention comprises a guide plate (1), four sub-pressing heads (2), four spiral slide rails (11) and four driving mechanisms (3), wherein the four spiral slide rails (11) are arranged on the guide plate (1) in a matrix distribution, and the spiral slide rails (11) adjacent to each other are arranged symmetrically, the four sub-pressing heads (2) are correspondingly arranged to slide in the four spiral slide rails (11), the four driving mechanisms (3) are used to correspondingly drive the four sub-pressing heads (2) to move along the spiral slide rails (11) where they are located, and after the four sub-pressing heads (2) move, the positions of the sub-pressing heads (2) adjacent to each other in their corresponding spiral slide rails (11) are symmetrical, and when pressure is applied to a target pressed part, the four sub-pressing heads (2) move synchronously towards the target pressed part.

2. The pressure head device according to claim 1, characterized in that: The four sub-pressing heads (2) are each provided with a pressure sensing unit for detecting the pressure of the sub-pressing heads (2) when pressure is applied to the target press-fitted part.

3. The pressure head device according to claim 1 or 2, characterized in that: The four sub-pressing heads (2) are each provided with a connecting piece (4), and the four sub-pressing heads (2) are connected to four driving mechanisms (3) via corresponding connecting pieces (4). The sub-pressing heads (2) can move axially relative to the connecting piece (4) or the connecting piece (4) is a telescopic structure. The connecting piece (4) is each provided with a spring (5), and one end of the spring (5) is in contact with the sub-pressing head (2).

4. The pressure head device according to claim 3, characterized in that: The guide plate (1) is provided with four spiral through grooves, and the four spiral through grooves correspond to four spiral slide rails (11). The four sub-pressing heads (2) are located on one side of the guide plate (1), and one end of the connecting piece (4) of the four sub-pressing heads (2) is provided with a matching boss (21), and the matching boss (21) is slidably inserted into the corresponding spiral slide rail (11). One end of the spring (5) is in contact with the matching boss (21) on the sub-pressing head (2), and the four driving mechanisms (3) are located on the other side of the guide plate (1).

5. The pressure head device according to claim 4, characterized in that: The single driving mechanism (3) comprises a rotary driving assembly, a matching plate (31), a rotating block (32) and a moving block (33); the rotating block (32) is arranged on the surface of the matching plate (31) and is rotationally matched with the matching plate (31); a curved sliding groove (311) is arranged on the surface of the matching plate (31) around the rotationally matched position; the moving block (33) is slidingly matched with the rotating block (32) along the length direction of the rotating block (32); and a strip-shaped through groove extending along the length direction of the rotating block (32) is provided through the bottom of the rotating block (32). (322), a positioning piece is provided at the bottom of the movable block (33), the positioning piece passes through the strip-shaped through groove (322) and is located in the curved slide groove (311), and one end of the connecting piece (4) facing the ion pressure head (2) is connected to the movable block (33); the rotary drive assembly drives the rotating block (32) and the matching plate (31) to rotate relative to each other, and the movable block (33) moves in the curved slide groove (311) through the positioning piece and slides linearly along the rotating piece, thereby driving the sub-pressure head (2) to move along the spiral slide rail (11).

6. The pressure head device according to claim 5, characterized in that: The rotating block (32) is provided with a wedge-shaped slide groove (321) extending along its length direction, the strip-shaped through groove (322) is connected to the wedge-shaped slide groove (321), and the bottom of the moving block (33) is provided with a wedge-shaped block (331), which is located in the wedge-shaped slide groove (321).

7. The pressure head device according to any one of claims 1, 2, 4-6, characterized in that: The sub-pressing head (2) is made of plastic, and the end face diameter of the sub-pressing head (2) is 5 mm.

8. A method for installing a power module cover, characterized in that: The installation method uses a pressure head device as described in any one of claims 1 to 7, and comprises the following steps: S1, identifying the type of target cover plate to be installed, and according to the optimal pressure position preset by the type information of the target cover plate, driving four sub-pressing heads (2) to move in corresponding spiral slide rails (11) through four driving mechanisms (3), so that the positions of the four sub-pressing heads (2) correspond to the optimal pressure positions of the target cover plate; S2, driving the four sub-pressing heads (2) to press down simultaneously to apply pressure to the target cover plate, so as to press the target cover plate to engage with the corresponding tube shell.

9. The method for installing a power module cover as claimed in claim 8, wherein: In S1, the type of the target cover plate to be installed is identified by the power module product identification code or the barcode of the tray.

10. The method for installing a power module cover as claimed in claim 8, wherein: When pressure sensing units are provided on all four sub-pressure heads (2), in S2, when the four sub-pressure heads (2) are pressed down simultaneously to apply pressure to the target cover plate, the pressure sensing units on the four sub-pressure heads (2) detect the pressure values ​​in real time and feed them back to the control system, and the control system determines whether the pressures of the four sub-pressure heads (2) are consistent and gives corresponding prompts.

Images