Oil pressure clamping and fixing equipment for welding upper box cover assembly

Abstract

The utility model discloses oil pressure clamping and fixing equipment for welding an upper box cover assembly, which comprises a working table, a lower plate height reference block, a lower plate inner support positioning device and a lower plate side positioning device which are used for positioning two inner holes of a lower plate, lug plate positioning and fixing devices used for positioning and fixing a left lug plate and a right lug plate are installed on the left side and the right side of the workbench, a front side plate positioning device used for positioning a front side plate is arranged on the front side of the workbench, a rear side plate positioning device used for positioning a rear side plate is arranged on the rear side of the workbench, and an upper plate height reference block is installed on a top plate of the front side plate positioning device and the rear side plate positioning device. An upper plate inner support positioning device used for positioning an upper plate center hole is arranged above the lower plate inner support positioning device, and an upper plate side positioning reference assembly used for positioning an upper plate side hole is arranged on the lower plate side positioning device. By means of the mode, the clamping device is compact in structure, reasonable in layout, capable of sequentially positioning and clamping all parts according to products so as to facilitate follow-up welding, and suitable for clamping products of different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of clamping, in particular to an oil pressure clamping and fixing device for welding an upper box cover assembly. Background Technique

[0002] As shown in Figure 1 the upper box cover assembly includes a lower plate 01, left and right ear plates 02, a front side plate 03, a rear side plate 04 and an upper plate 05. Central holes and side holes are provided on the upper and lower plates. The height of the upper and lower plates is limited by the front and rear side plates. The rear side plate is an arc-shaped plate. It is difficult to accurately position the front and rear side plates on the basis of the lower plate. On both left and right sides of the upper and lower plates are the left and right ear plates 02, and the left and right ear plates 02 are higher than the upper plate 05. The left and right ear plates 02 will inevitably affect the positioning and clamping of the upper plate 05. To sum up, it is difficult to position and clamp the upper box cover assembly, and the existing clamping equipment is difficult to meet the clamping and fixing of large and complex parts. Moreover, the products are generally of multiple specifications, and ordinary clamping equipment is difficult to be compatible.

[0003] Based on the above defects and deficiencies, it is necessary to improve the existing technology and design an oil pressure clamping and fixing device for welding an upper box cover assembly. Content of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide an oil pressure clamping and fixing device for welding an upper box cover assembly, which has a compact structure and a reasonable layout, can sequentially position and clamp each component according to the product for subsequent welding, and is suitable for clamping products of different specifications.

[0005] To solve the above technical problem, a technical solution adopted by the utility model is: to provide an oil pressure clamping and fixing device for welding an upper box cover assembly, which includes a workbench. A plurality of lower plate height reference blocks for positioning the clamping height of the lower plate are installed on the workbench. A lower plate inner support positioning device and a lower plate side positioning device for positioning two inner holes of the lower plate are installed on the workbench. Ear plate positioning and fixing devices for positioning and fixing the left and right ear plates are installed on both left and right sides of the workbench. A front side plate positioning device for positioning the front side plate is arranged on the front side of the workbench. A rear side plate positioning device for positioning the rear side plate is arranged on the rear side of the workbench. An upper plate height reference block is installed on the top plate of the front and rear side plate positioning devices. An upper plate inner support positioning device for positioning the central hole of the upper plate is arranged above the lower plate inner support positioning device. An upper plate side positioning reference component for positioning the side hole of the upper plate is arranged on the lower plate side positioning device.

[0006] Preferably, the lower plate internal support positioning device includes a hydraulic motor, a first bevel gear, a lead screw, a second bevel gear, a transfer frame and a clamping head. The hydraulic motor drives the first bevel gear to rotate, and three groups of lead screws are arranged in an array on the workbench around the hydraulic motor. The lead screws are each equipped with a second bevel gear meshing with the first bevel gear. The lead screw nut of the lead screw is equipped with a transfer frame, and the clamping head is installed at the outer end of the transfer frame. The first bevel gear and the second bevel gear are meshed and driven by the hydraulic motor. The three groups of clamping heads are stretched open to clamp the center hole of the lower plate. The clamping head is installed on the transfer frame through a pressure sensor. The pressure sensor is placed in the transfer frame, and the pressure sensor detects whether the pressure is clamped.

[0007] Preferably, the lower plate side positioning device includes a movable plate, a hand-cranked screw, a lateral positioning cylinder and a two-claw chuck. The movable plate is installed on the workbench through a linear slide rail. A hand-cranked screw is provided at the side end of the movable plate to drive its movement. The sliding block of the hand-cranked screw is fixedly connected to the movable plate. A lateral positioning cylinder and a two-claw chuck are installed on the movable plate. The lateral positioning cylinder drives the movable block of the two-claw chuck to clamp the side hole of the lower plate.

[0008] Preferably, the ear plate positioning and fixing device includes an X-axis push plate installed on the workbench through a linear slide rail, an X-axis cylinder driving the X-axis push plate to move horizontally, two sets of Y-axis hand-cranked screws installed on the X-axis push plate, a Y-axis push plate driven to move by the Y-axis hand-cranked screw, a Z-axis hand-cranked screw vertically installed on the Y-axis push plate, a Z-axis push plate driven to move by the Z-axis hand-cranked screw, a positioning cylinder installed on the Z-axis push plate, and a positioning pin driven by the positioning cylinder to extend and position the holes on the left and right ear plates. A powerful electromagnet for adsorbing the left and right ear plates is also installed on the Z-axis push plate.

[0009] Preferably, the front side plate positioning device includes a front push plate, a front hydraulic cylinder, a fixing frame, a front electromagnet reference block, a first clamping block and a front plate cylinder. The front push plate is mounted on the workbench through a linear slide rail. A front hydraulic cylinder that drives the front push plate to move back and forth is installed on the workbench. A fixing frame is installed on the front push plate. A front electromagnet reference block for adsorbing the front side plate is installed on the fixing frame. The first clamping block is rotatably mounted to the fixing frame through a support. A front plate cylinder is also installed in the fixing frame. The piston rod of the front plate cylinder is fixedly connected to the tail of the first clamping block.

[0010] Preferably, the rear side panel positioning device includes three groups of arc-shaped positioning components and a clamping component docked with the positioning component, and the structure of the positioning component is the same as that of the front side panel positioning device; the clamping component includes a clamping bracket, a clamping cylinder installed on the clamping bracket, and a second clamping block driven and extended by the clamping cylinder.

[0011] Preferably, the structure of the upper plate inner support positioning device is the same as that of the lower plate inner support positioning device.

[0012] Preferably, the upper plate side positioning reference assembly includes a positioning sleeve that is clamped onto the lower plate side positioning device, a positioning rod inserted into the positioning sleeve, a positioning block installed on the upper part of the positioning rod for positioning the lower part of the upper plate side hole, and a positioning frame located above the positioning block for positioning the upper part of the side hole.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The lower plate height reference block, the lower plate inner support positioning device, and the lower plate side positioning device cooperate to position the lower plate;

[0015] The ear plate positioning and fixing device can quickly position the left and right ear plates and adsorb and fix them through a powerful electromagnetic magnet;

[0016] The front side plate is clamped and fixed by the front side plate positioning device, and the arc-shaped rear side plate is clamped and fixed by the rear side plate positioning device. The front and rear side plates are repositioned based on the lower plate and the left and right ear plates;

[0017] The upper plate height reference block, the upper plate inner support positioning device, and the upper plate side positioning reference assembly cooperate to position the upper plate;

[0018] The hydraulic motor bevel gear rotates to drive the lead screw to move. The moving centering diameter is large, which is suitable for multiple products. -- Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the upper box cover assembly.

[0020] Figure 2 It is a schematic structural diagram of the upper box cover assembly from another perspective.

[0021] Figure 3 It is a schematic diagram of the working state of an oil pressure clamping and fixing device for welding an upper box cover assembly.

[0022] Figure 4 It is a schematic structural diagram of an oil pressure clamping and fixing device for welding an upper box cover assembly.

[0023] Figure 5 [[ID=4,3]]It is a top view of an oil pressure clamping and fixing device for welding an upper box cover assembly.

[0024] Figure 6 It is a schematic structural diagram of the lower plate inner support positioning device.

[0025] Figure 7 It is a schematic structural diagram of the lower plate side positioning device and the upper plate side positioning reference assembly. --

[0026] Figure 8 It is a schematic structural diagram of the ear plate positioning and fixing device.

[0027] Figure 9 It is a schematic structural diagram of the front side plate positioning device.

[0028] Figure 10 It is a schematic structural diagram of the rear side plate positioning device.

[0029] Among them, 01 is the lower plate, 02 is the left and right ear plates, 03 is the front side plate, 04 is the rear side plate, 05 is the upper plate; 1 is the workbench; 2 is the lower plate height reference block; 3 is the lower plate inner support positioning device, 31 is the hydraulic motor, 32 is the first bevel gear, 33 is the lead screw, 34 is the second bevel gear, 35 is the transfer rack, 36 is the clamping head; 4 is the lower plate side positioning device, 41 is the movable plate, 42 is the hand-operated lead screw, 43 is the lateral positioning oil cylinder, 44 is the two-jaw chuck; 5 is the ear plate positioning and fixing device, 51 is the X-direction push plate, 52 is the X-direction oil cylinder, 53 is the Y-direction hand-operated lead screw, 54 is the Y-direction push plate, 55 is the Z-direction hand-operated lead screw, 56 is the Z-direction push plate, 57 is the positioning oil cylinder, 58 is the positioning pin, 59 is the powerful electromagnet; 6 is the front side plate positioning device, 61 is the front push plate, 62 is the front hydraulic oil cylinder, 63 is the fixing frame, 64 is the front electromagnet reference block, 65 is the first clamping block, 66 is the front plate oil cylinder; 7 is the rear side plate positioning device, 71 is the positioning component, 72 is the pressing component, 721 is the clamping bracket, 722 is the clamping oil cylinder, 723 is the second clamping block; 8 is the upper plate height reference block; 9 is the upper plate inner support positioning device; 10 is the upper plate side positioning reference component, 101 is the positioning sleeve, 102 is the positioning rod, 103 is the positioning block, 104 is the positioning frame. Specific embodiments

[0030] The following combines the drawings to elaborate on the preferred embodiments of the present invention in detail, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0031] Please refer to Figures 3 to 10 , the embodiments of the present invention include:

[0032] An oil-pressure clamping and fixing device for welding an upper box cover assembly, including a workbench 1. On the workbench 1, a number of lower plate height reference blocks 2 for positioning the clamping height of the lower plate 01 are installed. On the workbench 1, a lower plate inner support positioning device 3 for positioning the two inner holes of the lower plate 01 and a lower plate side positioning device 4 are installed. On the left and right sides of the workbench 1, ear plate positioning and fixing devices 5 for positioning and fixing the left and right ear plates 02 are installed. On the front side of the workbench 1, a front side plate positioning device 6 for positioning the front side plate 03 is provided. On the rear side of the workbench 1, a rear side plate positioning device 7 for positioning the rear side plate 04 is provided. On the top plate of the front and rear side plate positioning devices, an upper plate height reference block 8 is installed. Above the lower plate inner support positioning device 3, an upper plate inner support positioning device 9 for positioning the central hole of the upper plate 05 is provided. On the lower plate side positioning device 4, an upper plate side positioning reference component 10 for positioning the side hole of the upper plate 05 is provided.

[0033] The lower plate inner support positioning device 3 includes a hydraulic motor 31, a first bevel gear 32, a lead screw 33, a second bevel gear 34, a transfer rack 35 and a clamping head 36. The hydraulic motor 31 drives the first bevel gear 32 to rotate. There are three groups of lead screws 33 arrayed on the workbench 1 around the hydraulic motor 31. On each lead screw 33, a second bevel gear 34 meshing with the first bevel gear 32 is installed. On the lead screw nut of the lead screw 33, a transfer rack 35 is installed. At the outer end of the transfer rack 35, a clamping head 36 is installed. Through the meshing transmission of the first bevel gear 32 and the second bevel gear 34, the hydraulic motor 31 drives the transfer rack 35 to move along the lead screw 33. The three groups of clamping heads 36 open and clamp the central hole of the lower plate 01. The clamping head 36 is installed on the transfer rack 35 through a pressure sensor. The pressure sensor is placed inside the transfer rack 35 to detect whether the pressure is clamped.

[0034] The lower plate side positioning device 4 includes a movable plate 41, a hand-operated lead screw 42, a lateral positioning oil cylinder 43 and a two-jaw chuck 44. The movable plate 41 is installed on the workbench 1 through a linear slide rail. At the side end of the movable plate 41, a hand-operated lead screw 42 for driving its movement is provided. The sliding block of the hand-operated lead screw 42 is fixedly connected to the movable plate 41. On the movable plate 41, a lateral positioning oil cylinder 43 and a two-jaw chuck 44 are installed. The lateral positioning oil cylinder 43 drives the movable block of the two-jaw chuck 44 to center and clamp the side hole of the lower plate 01.

[0035] The ear plate positioning and fixing device 5 includes an X-axis push plate 51 installed on the workbench 1 through a linear slide rail, an X-axis cylinder 52 that drives the X-axis push plate 51 to move horizontally, two groups of Y-axis hand-cranked screws 53 installed on the X-axis push plate 51, a Y-axis push plate 54 driven to move by the Y-axis hand-cranked screw 53, a Z-axis hand-cranked screw 55 vertically installed on the Y-axis push plate 54, a Z-axis push plate 56 driven to move by the Z-axis hand-cranked screw 55, a positioning cylinder 57 installed on the Z-axis push plate 56, and a positioning pin 58 driven by the positioning cylinder 57 to extend out of the hole position on the left and right ear plates 02. A strong electromagnet 59 for adsorbing the left and right ear plates 02 is also installed on the Z-axis push plate 56.

[0036] The front side plate positioning device 6 includes a front push plate 61, a front hydraulic cylinder 62, a fixing frame 63, a front electromagnet reference block 64, a first clamping block 65 and a front plate cylinder 66. The front push plate 61 is installed on the workbench 1 through a linear slide rail. The workbench 1 is equipped with a front hydraulic cylinder 62 that drives the front push plate 61 to move forward and backward. The front push plate 61 is equipped with a fixing frame 63. The fixing frame 63 is equipped with a front electromagnet reference block 64 for adsorbing the front side plate 03. The first clamping block 65 is rotatably installed on the fixing frame 63 through a support. A front plate cylinder 66 is also installed in the fixing frame 63. The piston rod of the front plate cylinder 66 is fixedly connected to the tail of the first clamping block 65.

[0037] The rear side panel positioning device 7 includes three groups of arc-shaped positioning components 71 and a clamping component 72 docked with the positioning component 71. The structure of the positioning component 71 is the same as that of the front side panel positioning device 6; the clamping component 72 includes a clamping bracket 721, a clamping cylinder 722 installed on the clamping bracket 721, and a second clamping block 723 driven out by the clamping cylinder 722.

[0038] The structure of the upper plate inner support positioning device 9 is the same as that of the lower plate inner support positioning device 3 .

[0039] The upper plate side positioning reference assembly 10 includes a positioning sleeve 101 that is clamped onto the lower plate side positioning device 4, a positioning rod 102 that is inserted into the positioning sleeve 101, a positioning block 103 installed on the upper part of the positioning rod 102 for positioning the lower part of the side hole of the upper plate 05, and a positioning frame 104 located above the positioning block 103 for positioning the upper part of the side hole.

[0040] The utility model discloses a hydraulic clamping and fixing device for welding an upper box cover assembly. When the device is working, the device uses a manual button to control the clamping and loosening to achieve product assembly welding, including the following steps:

[0041] Lower plate 01 clamping and fixing: Workers use a gantry crane to assist in placing the lower plate 01 of the product on the lower plate height reference block 2. The central hole of the lower plate 01 is sleeved on the inner support positioning device 3 of the lower plate, and the side hole of the lower plate 01 is sleeved on the side positioning device 4 of the lower plate. The hydraulic motor 31 drives the first bevel gear 32 to rotate. Through the meshing transmission of the first bevel gear 32 and the second bevel gear 34, the hydraulic motor 31 drives the transfer rack 35 to move along the lead screw 33. The three groups of clamping heads 36 expand to clamp the central hole of the lower plate 01. The pressure sensor detects whether the pressure is sufficient for clamping. After the device receives the signal, it can operate other sequential actions. The lateral positioning oil cylinder 43 drives the movable block of the two-jaw chuck 44 to center and clamp the side hole of the lower plate 01, and the positioning and clamping of the lower plate 01 are completed;

[0042] Initial positioning of the left and right ear plates 02: Workers use a gantry crane to assist in placing the left and right ear plates 02 at the ear plate positioning and fixing device 5. The positioning oil cylinder 57 drives the positioning pin 58 to extend and insert into the corresponding hole positions of the left and right ear plates 02. The powerful electromagnet 59 adsorbs the left and right ear plates 02. The Y-direction hand-operated lead screw 53 and the Z-direction hand-operated lead screw 55 are adjusted to align the left and right ear plates 02 with the installation position of the lower plate 01. The X-direction oil cylinder 52 drives the X-direction push plate 51 to move, so that the left and right ear plates 02 move to the corresponding positions;

[0043] Clamping and fixing of the front side plate 03: Workers use a gantry crane to assist in placing the front side plate 03 at the front electromagnet reference block 64. The front side plate 03 is located on the lower plate 01 and is adsorbed by the front electromagnet reference block 64. The front hydraulic cylinder 62 drives the front electromagnet reference block 64 on the fixing frame 63 to move towards the lower plate 01, and the front side plate 03 moves to the corresponding position;

[0044] Clamping and fixing of the rear side plate 04: Workers use a gantry crane to assist in placing the rear side plate 04 at the positioning assembly 71. Since the rear side plate 04 is an arc-shaped plate, it is difficult to fix it by adsorption. The pressing assembly 72 extends to clamp the rear side plate 04, and the positioning assembly 71 and the pressing assembly 72 synchronously move the rear side plate 04 to the corresponding position;

[0045] Reset of the left and right ear plates 02: The ear plate positioning and fixing device 5 drives the left and right ear plates 02 to retract, so that the left and right ear plates 02 move to the origin position to avoid the clamping and fixing of the upper plate 05;

[0046] Clamping and fixing of the upper plate 05: Workers use a gantry crane to assist in placing the upper plate 05 on the upper plate height reference block 8. The central hole of the upper plate 05 is sleeved on the inner support positioning device 9 of the upper plate, and the side hole of the upper plate 05 is sleeved on the side positioning reference assembly 10 of the upper plate. The inner support positioning device 9 of the upper plate expands to clamp the central hole of the upper plate 05, and the positioning rod 102 and the positioning frame 104 are placed in sequence to position the side hole of the upper plate 05;

[0047] Re-positioning of the left and right ear plates 02: The re-positioning of the left and right ear plates 02 is the same as the initial positioning step of the left and right ear plates 02, and the left and right ear plates 02 move to the corresponding positions;

[0048] Upper plate 05 clamping: The clamping blocks on the front side plate positioning device 6 and the rear side plate positioning device 7 are driven by the front plate oil cylinder 66 to move downwards to press the upper plate 05 tightly.

[0049] Welding: All the oil cylinders hold the components, and the worker performs manual welding. After the upper box cover assembly is welded, the bearing sleeve three-jaw positioning part is manually placed to position the product, and then the bearing sleeve is welded. After all the accessories of the upper box cover assembly are welded, the clamping devices are retracted in sequence.

[0050] The oil pressure clamping and fixing device for welding the upper box cover assembly of the present utility model has a compact structure and a reasonable layout. It can sequentially position and clamp each component according to the product for subsequent welding, and is suitable for clamping products of different specifications.

[0051] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. An oil pressure clamping and fixing device for welding an upper box cover assembly, characterized in that: It includes a workbench (1), on which several lower plate height reference blocks (2) for clamping the height of the positioning lower plates (01) are installed. On the workbench (1), a lower plate inner support positioning device (3) and a lower plate side positioning device (4) for positioning the two inner holes of the lower plate are installed. On the left and right sides of the workbench (1), ear plate positioning and fixing devices (5) for positioning and fixing the left and right ear plates (02) are installed. On the front side of the workbench (1), a front side plate positioning device (6) for positioning the front side plate (03) is provided. On the rear side of the workbench (1), a rear side plate positioning device (7) for positioning the rear side plate (04) is provided. On the top plate of the front and rear side plate positioning devices, an upper plate height reference block (8) is installed. Above the lower plate inner support positioning device (3), an upper plate inner support positioning device (9) for positioning the center hole of the upper plate (05) is provided. On the lower plate side positioning device (4), an upper plate side positioning reference assembly (10) for positioning the side hole of the upper plate (05) is provided.

2. The hydraulic clamping and fixing device for welding the upper box cover assembly according to claim 1, wherein: The lower plate inner support positioning device (3) includes a hydraulic motor (31), a first bevel gear (32), a lead screw (33), a second bevel gear (34), a transfer rack (35), and a clamping head (36). The hydraulic motor (31) drives the first bevel gear (32) to rotate. Three groups of lead screws (33) are arranged in an array on the workbench (1) around the hydraulic motor (31). On each lead screw (33), a second bevel gear (34) meshing with the first bevel gear (32) is installed. A transfer rack (35) is installed on the lead screw nut of the lead screw (33). A clamping head (36) is installed at the outer end of the transfer rack (35). The clamping head (36) is installed on the transfer rack (35) through a pressure sensor, and the pressure sensor is placed inside the transfer rack (35).

3. An oil pressure clamping and fixing device for welding an upper box cover assembly according to claim 1, characterized in that: The lower plate side positioning device (4) includes a movable plate (41), a hand-operated lead screw (42), a lateral positioning oil cylinder (43), and a two-jaw chuck (44). The movable plate (41) is installed on the workbench (1) through a linear slide rail. A hand-operated lead screw (42) for driving its movement is provided at the side end of the movable plate (41). The sliding block of the hand-operated lead screw (42) is fixedly connected to the movable plate (41). A lateral positioning oil cylinder (43) and a two-jaw chuck (44) are installed on the movable plate (41). The lateral positioning oil cylinder (43) drives the movable block of the two-jaw chuck (44) to center and clamp the side hole of the lower plate (01).

4. An oil pressure clamping and fixing device for welding an upper box cover assembly according to claim 1, characterized in that: The ear plate positioning and fixing device (5) includes an X-direction push plate (51) installed on the workbench (1) through a linear slide rail, an X-direction oil cylinder (52) for driving the horizontal movement of the X-direction push plate (51), two groups of Y-direction hand-operated lead screws (53) installed on the X-direction push plate (51), a Y-direction push plate (54) driven by the Y-direction hand-operated lead screw (53) to move, a Z-direction hand-operated lead screw (55) vertically installed on the Y-direction push plate (54), a Z-direction push plate (56) driven by the Z-direction hand-operated lead screw (55) to move, a positioning oil cylinder (57) installed on the Z-direction push plate (56), and a positioning pin (58) driven by the positioning oil cylinder (57) to extend into the hole positions on the left and right ear plates (02). A powerful electromagnet (59) for adsorbing the left and right ear plates (02) is also installed on the Z-direction push plate (56).

5. An oil pressure clamping and fixing device for welding an upper box cover assembly according to claim 1, characterized in that: The front side plate positioning device (6) includes a front push plate (61), a front hydraulic cylinder (62), a fixing frame (63), a front electromagnet reference block (64), a first clamping block (65), and a front plate oil cylinder (66). The front push plate (61) is installed on the workbench (1) through a linear slide rail. A front hydraulic cylinder (62) for driving the front and back movement of the front push plate (61) is installed on the workbench (1). A fixing frame (63) is installed on the front push plate (61). A front electromagnet reference block (64) for adsorbing the front side plate (03) is installed on the fixing frame (63). The first clamping block (65) is rotatably installed on the fixing frame (63) through a support. A front plate oil cylinder (66) is also installed inside the fixing frame (63). The piston rod of the front plate oil cylinder (66) is fixedly connected to the tail of the first clamping block (65).

6. The hydraulic clamping and fixing device for welding the upper box cover assembly according to claim 1, wherein: The rear side plate positioning device (7) includes three groups of positioning components (71) distributed in an arc shape and a pressing component (72) arranged in butt joint with the positioning components (71). The structure of the positioning component (71) is the same as that of the front side plate positioning device (6). The pressing component (72) includes a clamping bracket (721), a clamping oil cylinder (722) installed on the clamping bracket (721), and a second clamping block (723) driven by the clamping oil cylinder (722) to extend out.

7. An oil pressure clamping and fixing device for welding an upper box cover assembly according to claim 1, characterized in that: The structure of the upper plate inner support positioning device (9) is the same as that of the lower plate inner support positioning device (3).

8. An oil pressure clamping and fixing device for welding an upper box cover assembly according to claim 1, characterized in that: The upper plate side positioning reference component (10) includes a positioning sleeve (101) clamped on the lower plate side positioning device (4), a positioning rod (102) inserted into the positioning sleeve (101), a positioning block (103) installed on the upper part of the positioning rod (102) for positioning the lower part of the side hole of the upper plate (05), and a positioning frame (104) located above the positioning block (103) for positioning the upper part of the side hole.

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