Back pressure forming die frame structure of aluminum alloy scroll plate

Abstract

The utility model discloses an aluminum alloy scroll plate backpressure forming die frame structure which comprises an upper die part and a lower die part, the upper die part comprises an upper punch and an upper heating assembly, the lower die part comprises a lower die, a special-shaped ejection block, a backpressure assembly and a lower heating assembly, a forming cavity is formed in the lower die, the upper punch is arranged over the forming cavity, and the lower punch is arranged over the forming cavity. An ejection cavity is formed in the bottom of the forming cavity and extends vertically, the special-shaped ejection block is arranged in the ejection cavity, the back pressure assembly is arranged below the special-shaped ejection block and is in transmission connection with the special-shaped ejection block, the back pressure assembly can drive the special-shaped ejection block to vertically move in the ejection cavity, the upper heating assembly is used for heating the upper punch, and the lower heating assembly is used for heating the lower punch. The lower heating assembly is used for heating the lower die; the extrusion forming device can provide enough back pressure at a proper temperature to realize extrusion forming of the scroll plate, the end part of the formed scroll plate is flat, the shape is filled fully without defects, and the turning allowance is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to a forming die technical field, concretely relates to a kind of aluminum alloy scroll disc back pressure forming die frame structure. BACKGROUND

[0002] Dynamic static scroll disc is applied to the main part on air-conditioning scroll compressor. The aluminum alloy scroll disc of prior art generally adopts die casting and open forging to complete blank manufacturing.

[0003] When adopting the method of die casting to make blank, pore, sand eye is easily produced, and the overall organization is loose, and product quality is poor. When adopting the method of open forging to make blank, scroll disc end is uneven, and larger allowance and larger flash are left to facilitate subsequent processing forming, and subsequent processing allowance is large, and process is complex.

[0004] In view of the above-mentioned defects, the utility model creator finally obtains the utility model after long time research and practice. UTILITY MODEL CONTENT

[0005] To solve the above technical defects, the utility model adopts the technical scheme, which provides an aluminum alloy scroll disc back pressure forming die frame structure, which comprises an upper die part and a lower die part, the upper die part comprises an upper punch and an upper heating assembly, the lower die part comprises a lower die, a special-shaped ejection block, a back pressure assembly and a lower heating assembly, the lower die is provided with a forming cavity, the upper punch is arranged vertically above the forming cavity, the bottom of the forming cavity is provided with an ejection cavity, the ejection cavity extends vertically, and the special-shaped ejection block is arranged in the ejection cavity, the back pressure assembly is arranged below the special-shaped ejection block and is in transmission connection with the special-shaped ejection block, the back pressure assembly can drive the special-shaped ejection block to move vertically in the ejection cavity, the upper heating assembly is used to heat the upper punch, and the lower heating assembly is used to heat the lower die.

[0006] Preferably, the upper die part further comprises an upper die seat, an upper die cylinder, a punch transition sleeve and an upper die gland, the upper punch is fixedly arranged on the upper die seat through the punch transition sleeve, and the punch transition sleeve is fixedly connected through the upper die gland and the upper die cylinder.

[0007] Preferably, the upper die seat comprises an upper die plate, a first pad and a second pad, the first pad is arranged in the mounting hole of the upper die plate, and the upper die plate is connected with the machine tool slide to realize the clamping and fixing of the first pad by the upper die plate; the second pad is arranged below the first pad and in contact with the first pad, and the second pad is arranged in the punch transition sleeve and is clamped and fixed by the punch transition sleeve; the upper punch is arranged below the second pad and in contact with the second pad.

[0008] Preferably, the upper heating assembly comprises an upper heating rod, an upper thermocouple and a heating fixing seat, the heating fixing seat is sleeved outside the upper punch, and the heating fixing seat is fixedly arranged below the punch transition sleeve through a fixing pressing ring, the heating fixing seat is provided with a first heating hole and a second heating hole, the first heating hole is vertically arranged, and the second heating hole is horizontally arranged, the upper heating rod is inserted into the first heating hole, and the upper thermocouple is inserted into the second heating hole.

[0009] Preferably, the upper punch is provided with a punch heating hole, the punch heating hole and the second heating hole are coaxially arranged, the end of the upper thermocouple can be inserted into the punch heating hole through the second heating hole, and therefore the upper punch can be more effectively heated.

[0010] Preferably, the heating fixing seat is provided with a heating pressing ring at the bottom, the heating pressing ring is sleeved on the upper punch and fixedly arranged at the bottom of the heating fixing seat, and the bottom of the upper heating rod is in contact with the heating pressing ring.

[0011] Preferably, the lower die part further comprises a lower die seat and a lower die cylinder, the lower die cylinder is fixedly arranged on the lower die seat, and the lower die cylinder is fixedly arranged in the lower die cylinder through a lower die pressing cover, the lower die seat comprises a lower die plate, a third gasket and a fourth gasket, the third gasket and the fourth gasket are arranged in the lower die cylinder, the fourth gasket is arranged on the lower die plate, and the third gasket is arranged between the lower die and the fourth gasket.

[0012] Preferably, the lower heating assembly comprises a lower heating rod and a lower thermocouple, the lower die cylinder is provided with a third heating hole, the lower die is provided with a fourth heating hole and a fifth heating hole, the third heating hole and the fourth heating hole are coaxially and horizontally arranged, and the fifth heating hole is vertically arranged, the lower thermocouple is simultaneously inserted into the third heating hole and the fourth heating hole, and the lower heating rod is arranged in the fifth heating hole.

[0013] Preferably, a back pressure hole is vertically arranged in the third pad, a back pressure cavity is arranged at the center of the fourth pad, a hydraulic cavity is arranged on the lower die plate, and the back pressure hole, the back pressure cavity and the hydraulic cavity are correspondingly arranged; the back pressure assembly comprises a piston, a back pressure ejector rod and a hydraulic cylinder bushing, the hydraulic cylinder bushing is fixedly arranged in the hydraulic cavity through the fourth pad, one end of the piston is arranged in the back pressure cavity and the other end is arranged in the hydraulic cylinder bushing, the piston can vertically move in the back pressure cavity and the hydraulic cavity, a plurality of back pressure ejector rods are fixedly arranged on the upper end of the piston, the back pressure ejector rods are correspondingly arranged in the back pressure holes, the upper ends of the back pressure ejector rods are in contact with the shaped ejector block, and a hydraulic hole is further arranged on the lower die plate, one end of the hydraulic hole is in communication with external hydraulic equipment, and the other end is in communication with the hydraulic cavity.

[0014] Preferably, a fifth pad is arranged at the lower part of the hydraulic cavity, the fifth pad is fixedly arranged on the lower die plate through a locking nut, the fifth pad abuts against the lower part of the hydraulic cylinder bushing to fix the position of the hydraulic cylinder bushing, an ejecting hole is vertically arranged on the fifth pad, and an ejecting rod is arranged in the ejecting hole.

[0015] Compared with the prior art, the aluminum alloy scroll disc back pressure forming die frame structure has the beneficial effects that: the aluminum alloy scroll disc back pressure forming die frame structure can provide sufficient back pressure at a suitable temperature to realize extrusion forming of the scroll disc, the formed scroll disc has a flat end part, a full shape and no defects, and has a small turning allowance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural view of the aluminum alloy scroll disc back pressure forming die frame structure.

[0017] Figure 2 It is a matching structural view of the upper punch and the lower die.

[0018] Figure 3 It is a structural plan view of the lower die part.

[0019] Numerals in the drawing represent:

[0020] 1 - upper die plate; 2 - first pad; 3 - second pad; 4 - upper die cylinder; 5 - upper die gland; 6 - punch transition sleeve; 7 - upper punch; 8 - lower die gland; 9 - lower die cylinder; 10 - lower die plate; 11 - lower die; 12 - shaped ejector block; 13 - back pressure ejector rod; 14 - piston; 15 - ejecting rod; 16 - third pad; 17 - fourth pad; 18 - hydraulic hole; 19 - hydraulic cylinder bushing; 20 - fifth pad; 21 - locking nut; 22 - fixed pressing ring; 23 - heating fixing seat; 24 - heating pressing ring; 25 - upper heating rod; 26 - upper thermocouple; 27 - lower heating rod; 28 - lower thermocouple. DETAILED DESCRIPTION

[0021] The technical features and advantages of the present application are described in more detail below with reference to the accompanying drawings.

[0022] Embodiment one

[0023] As shown in Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural view of the aluminum alloy scroll disc back pressure forming die structure; Figure 2 is a matching structure view of the upper punch and the lower die; Figure 3 is a structural plan view of the lower die part.

[0024] The aluminum alloy scroll disc back pressure forming die structure comprises an upper die part and a lower die part, the upper die part comprises an upper punch 7 and an upper heating assembly, the lower die part comprises a lower die 11, a special-shaped ejection block 12, a back pressure assembly and a lower heating assembly, a forming cavity is arranged in the lower die 11, the upper punch 7 is arranged directly above the forming cavity, an ejection cavity is arranged at the bottom of the forming cavity, the ejection cavity extends vertically, and the special-shaped ejection block 12 is arranged in the ejection cavity, the back pressure assembly is arranged below the special-shaped ejection block 12 and is in transmission connection with the special-shaped ejection block 12, the back pressure assembly can drive the special-shaped ejection block 12 to move vertically in the ejection cavity, the upper heating assembly is used for heating the upper punch 7, and the lower heating assembly is used for heating the lower die 11.

[0025] The upper heating assembly preheats the upper punch 7, the lower heating assembly preheats the lower die 11, and the back pressure assembly applies pressure to the special-shaped ejection block 12 to provide back pressure, so that the blank is fully filled in the forming cavity, so that the aluminum alloy scroll disc with a flat end is obtained by back pressure forming at a suitable temperature.

[0026] Generally, for the aluminum alloy scroll disc, the special-shaped ejection block 12 is arranged as a flat plate extending along a spiral, so as to realize top pressing back pressure on the bottom of the aluminum alloy scroll disc during the forming process.

[0027] The present application can provide sufficient back pressure to realize extrusion forming of the scroll disc at a suitable temperature, the formed scroll disc has a flat end, a full and defect-free shape, and a small turning allowance.

[0028] Embodiment two

[0029] The upper die part further comprises an upper die seat, an upper die cylinder 4, a punch transition sleeve 6 and an upper die gland 5, the upper punch 7 is fixedly arranged on the upper die seat through the punch transition sleeve 6, the punch transition sleeve 6 is fixedly connected through the upper die gland 5 and the upper die cylinder 4, so as to realize the fixed arrangement of the upper punch 7 on the upper die part.

[0030] Preferably, the upper die seat comprises an upper die plate 1, a first pad 2 and a second pad 3, the first pad 2 is arranged in the mounting hole of the upper die plate 1, and is connected with the machine tool slide through the upper die plate 1 to realize the clamping and fixing of the upper die plate 1 to the first pad 2; the second pad 3 is arranged below the first pad 2 and in contact with the first pad 2, and the second pad 3 is arranged in the punch transition sleeve 6 and is fixedly arranged through the punch transition sleeve 6 to realize the clamping and fixing of the punch transition sleeve 6 to the second pad 3; the upper punch 7 is arranged below the second pad 3 and in contact with the second pad 3, and the cross-sectional areas of the first pad 2, the second pad 3 and the upper punch 7 are sequentially reduced, so as to realize the smooth transition of the pressure of the pressure conducting member.

[0031] The upper heating assembly comprises an upper heating rod 25, an upper thermocouple 26 and a heating fixing seat 23, the heating fixing seat 23 is sleeved outside the upper punch 7, and the heating fixing seat 23 is fixedly arranged below the punch transition sleeve 6 through a fixing pressure ring 22, the heating fixing seat 23 is provided with a first heating hole and a second heating hole, the first heating hole is vertically arranged, and the second heating hole is horizontally arranged, the upper heating rod 25 is inserted into the first heating hole, and the upper thermocouple 26 is inserted into the second heating hole, so as to realize the heating operation of the upper punch 7.

[0032] Generally, the upper punch 7 is provided with a punch heating hole, the punch heating hole and the second heating hole are coaxially arranged, the end of the upper thermocouple 26 can be inserted into the punch heating hole through the second heating hole, so as to realize more effective heating of the upper punch 7.

[0033] Preferably, the heating fixing seat 23 is provided with a heating pressure ring 24 at the bottom, the heating pressure ring 24 is sleeved on the upper punch 7 and is fixedly arranged at the bottom of the heating fixing seat 23, the bottom of the upper heating rod 25 is arranged in contact with the heating pressure ring 24, so as to stabilize the position of the upper heating rod 25 in the first heating hole, so as to avoid the upper heating rod 25 from sliding out of the first heating hole due to its own gravity.

[0034] Embodiment three

[0035] The lower die part further comprises a lower die seat and a lower die cylinder 9, the lower die cylinder 9 is fixedly arranged on the lower die seat, the lower die cylinder 9 is fixedly arranged in the lower die cylinder 9 through a lower die pressing cover 8, the lower die seat comprises a lower die plate 10, a third gasket 16 and a fourth gasket 17, the third gasket 16 and the fourth gasket 17 are arranged in the lower die cylinder 9, the fourth gasket 17 is arranged on the lower die plate 10, and the third gasket 16 is arranged between the lower die 11 and the fourth gasket 17, so as to realize the fixed support of the lower die 11.

[0036] The lower heating assembly comprises a lower heating rod 27 and a lower thermocouple 28, the lower die cylinder 9 is provided with a third heating hole, the lower die 11 is provided with a fourth heating hole and a fifth heating hole, the third heating hole and the fourth heating hole are coaxially and horizontally arranged, and the fifth heating hole is vertically arranged, the lower thermocouple 28 is simultaneously inserted into the third heating hole and the fourth heating hole, and the lower heating rod 27 is arranged in the fifth heating hole, so as to realize the heating operation of the lower die 11.

[0037] Preferably, the third gasket 16 is vertically provided with a back pressure hole, the fourth gasket 17 is provided with a back pressure cavity at the center, the lower die plate 10 is provided with a hydraulic cavity, and the back pressure hole, the back pressure cavity and the hydraulic cavity are correspondingly arranged; the back pressure assembly comprises a piston 14, a back pressure ejector rod 13 and a hydraulic cylinder bushing 19, the hydraulic cylinder bushing 19 is fixedly arranged in the hydraulic cavity through the fourth gasket 17, one end of the piston 14 is arranged in the back pressure cavity and the other end is arranged in the hydraulic cylinder bushing 19, the piston 14 can vertically move in the back pressure cavity and the hydraulic cavity, a plurality of back pressure ejector rods 13 are fixedly arranged on the upper end of the piston 14, the back pressure ejector rods 13 are correspondingly arranged in the back pressure holes, and the upper ends of the back pressure ejector rods 13 are in contact with the profiled ejector block 12, the back pressure of the aluminum alloy scroll disc during extrusion forming can be adjusted by adjusting the hydraulic pressure in the hydraulic cylinder bushing 19 to adjust the pressure of the back pressure ejector rods 13 on the profiled ejector block 12, so as to complete the back pressure forming of the aluminum alloy scroll disc.

[0038] Preferably, one end of the piston 14 is sealingly connected with the inner wall of the back pressure cavity through a sealing ring, and the other end is sealingly connected with the inner wall of the hydraulic cylinder bushing 19 through a sealing ring to ensure the hydraulic effect.

[0039] The lower die plate 10 is further provided with a hydraulic hole 18, one end of the hydraulic hole 18 is in communication with external hydraulic equipment, and the other end is in communication with the hydraulic cavity, so that the hydraulic pressure in the hydraulic cylinder bushing 19 can be adjusted through the hydraulic equipment.

[0040] Preferably, the lower part of the hydraulic cavity is provided with a fifth pad 20, which is fixed on the lower die plate 10 by a locking nut 21, and the fifth pad 20 abuts against the lower part of the hydraulic cylinder liner 19 to fix the position of the hydraulic cylinder liner 19. A ejection hole is vertically arranged on the fifth pad 20, and an ejection rod 15 is arranged in the ejection hole. The ejection rod 15 can vertically move upward until the piston 14 is ejected, so as to drive the special-shaped ejection block 12 to move upward and eject the aluminum alloy scroll disc from the forming cavity.

[0041] The fifth pad 20 is sealingly connected with the inner wall of the hydraulic cavity by a sealing ring, and the ejection rod 15 is sealingly connected with the inner wall of the ejection hole by a sealing ring, so as to ensure the hydraulic effect.

[0042] Since the scroll disc is made of aluminum alloy and needs to be hot forged, the hydraulic cavity is arranged in the lower die plate 10, so that the structure of the die is simplified. The back pressure assembly adopts a hydraulic form, and garbage and lubricating liquid will not affect the structure of the hydraulic cylinder. In addition, the back pressure cylinder can freely adjust the back pressure and stroke according to the size of the forged piece, and is convenient to use. The bidirectional hydraulic cylinder structure can make the piston 14 retreat, so that the special-shaped ejection block 12 is ejected and reset, which is beneficial to the lubrication of the die and the placement of the blank.

[0043] When the upper heating rod 25 and the lower heating rod 27 are used to preheat the die, the required temperature can be reached faster, which is more beneficial to the forming of the forged piece, reduces the extrusion force, makes the forged piece full and defect-free, and improves the production efficiency. The upper thermocouple 26 and the lower thermocouple 28 can effectively control the temperature of the die, so as to improve the forming quality of the scroll disc, reduce the generation of waste products and the waste of raw materials. During the heating process, the surface temperature of the die needs to be checked frequently to ensure that it does not exceed the heat resistance range of the material.

[0044] The use process of the utility model is: first, according to the size of the forging, select reasonable back pressure, preheat 150 DEG C to 180 DEG C of the upper punch 7 with the lower mould 11, spray oil-based graphite in the forming cavity of the lower mould 11, put the blank into the forming cavity of the lower mould 11, the machine tool slide drives the upper mould portion to move downward, the upper punch 7 enters the forming cavity of the lower mould 11, the upper punch 7 continues to move downward until the upper punch 7 end surface and blank end surface contact, at this time, the back pressure assembly provides certain back pressure to push the piston 14 to move upward, the piston 14 pushes the back pressure ejector rod 13 to move upward, the back pressure ejector rod 13 pushes the special-shaped ejector block 12 to move upward, the upper end surface of the special-shaped ejector block 12 is flush with the bottom surface of the forming cavity, the upper punch 7 moves downward and extrudes the blank, material flows along the forming cavity to the back pressure cavity, the special-shaped ejector block 12 is moved downward and partially formed in the back pressure cavity by the flow of material, in the process of forging forming, the upper end surface of the special-shaped ejector block 12 is always in contact with the forging due to the upward back pressure provided by the back pressure assembly, so that the end surface of the formed forging is always flush, after the upper punch 7 moves downward to the set distance, the forging is formed in place.The machine tool slide drives the upper mould portion to move upward, the upper punch 7 is separated from the upper end surface of the forging, at this time, the ejector rod 15 moves upward, the ejector rod 15 pushes the back pressure ejector rod 13 to move upward, the back pressure ejector rod 13 pushes the special-shaped ejector block 12 to move upward, the special-shaped ejector block 12 pushes the forging to move upward, and the forging is completely pushed out of the forming cavity, and the forging is taken out and put into the frame by the clamp.When the next forging extrusion is carried out, the piston 14 retreats, at this time, the special-shaped ejector block 12 can be reset by artificial knocking, and oil-based graphite is sprayed into the forming cavity of the lower mould 11 again, and the next piece is extruded.

[0045] The above only describes the preferred embodiment of the utility model, which is only illustrative but not limiting for the utility model. The skilled person understands that many changes, modifications and even equivalents can be made to the utility model within the spirit and scope defined by the claims of the utility model, but all will fall within the protection scope of the utility model.

Claims

1. An aluminum alloy scroll back pressure forming die set structure, characterized by, The upper die part comprises an upper punch and an upper heating assembly, and the lower die part comprises a lower die, a special-shaped ejection block, a back pressure assembly and a lower heating assembly, the lower die is provided with a forming cavity, the upper punch is arranged directly above the forming cavity, the forming cavity is provided with an ejection cavity at the bottom, the ejection cavity vertically extends, the special-shaped ejection block is arranged in the ejection cavity, the back pressure assembly is arranged below the special-shaped ejection block and is in transmission connection with the special-shaped ejection block, the back pressure assembly can drive the special-shaped ejection block to vertically move in the ejection cavity, the upper heating assembly is used for heating the upper punch, and the lower heating assembly is used for heating the lower die.

2. The aluminum alloy scroll back pressure forming die set structure of claim 1 wherein, The upper die part further comprises an upper die seat, an upper die cylinder, a punch transition sleeve and an upper die gland, the upper punch is fixedly arranged on the upper die seat through the punch transition sleeve, and the punch transition sleeve is fixedly connected through the upper die gland and the upper die cylinder.

3. The aluminum alloy scroll back pressure forming die set structure of claim 2 wherein, The upper die seat comprises an upper die plate, a first pad and a second pad, the first pad is arranged in a mounting hole of the upper die plate and is connected with a machine tool slide through the upper die plate to realize clamping and fixing of the upper die plate to the first pad, the second pad is arranged below the first pad and in contact with the first pad, the second pad is arranged in the punch transition sleeve and is clamped and fixed by the punch transition sleeve, and the upper punch is arranged below the second pad and in contact with the second pad.

4. The aluminum alloy scroll back pressure forming die set structure of claim 2 wherein, The upper heating assembly comprises an upper heating rod, an upper thermocouple and a heating fixing seat, the heating fixing seat is sleeved outside the upper punch, the heating fixing seat is fixedly arranged below the punch transition sleeve through a fixed pressing ring, the heating fixing seat is provided with a first heating hole and a second heating hole, the first heating hole vertically extends, the second heating hole horizontally extends, the upper heating rod is inserted into the first heating hole, and the upper thermocouple is inserted into the second heating hole.

5. The aluminum alloy scroll back pressure forming die set structure of claim 4 wherein, The upper punch is provided with a punch heating hole, the punch heating hole and the second heating hole are coaxially arranged, and the end of the upper thermocouple is inserted into the punch heating hole through the second heating hole.

6. The aluminum alloy scroll back pressure forming die set structure of claim 4 wherein, The bottom of the heating fixing seat is provided with a heating pressing ring, the heating pressing ring is sleeved on the upper punch and fixedly arranged at the bottom of the heating fixing seat, and the bottom of the upper heating rod is arranged in contact with the heating pressing ring.

7. The aluminum alloy scroll back pressure forming die set structure of claim 1 wherein, The lower die part further comprises a lower die seat and a lower die cylinder, the lower die cylinder is fixedly arranged on the lower die seat, the lower die cylinder is fixedly arranged in the lower die cylinder through a lower die gland, the lower die seat comprises a lower die plate, a third pad and a fourth pad, the third pad and the fourth pad are arranged in the lower die cylinder, the fourth pad is arranged on the lower die plate, and the third pad is arranged between the lower die and the fourth pad.

8. The aluminum alloy scroll back pressure forming die set structure of claim 7 wherein, The lower heating assembly comprises a lower heating rod and a lower thermocouple, the lower mold cylinder is provided with a third heating hole, the lower mold is provided with a fourth heating hole and a fifth heating hole, the third heating hole and the fourth heating hole are coaxially and horizontally arranged, the fifth heating hole is vertically arranged, the lower thermocouple is inserted into the third heating hole and the fourth heating hole at the same time, and the lower heating rod is arranged in the fifth heating hole.

9. The aluminum alloy scroll back pressure forming die set structure of claim 7 wherein, A back pressure hole is vertically arranged in the third pad, a back pressure cavity is arranged at the center of the fourth pad, a hydraulic cavity is arranged on the lower mold plate, and the back pressure hole, the back pressure cavity and the hydraulic cavity are correspondingly arranged; the back pressure assembly comprises a piston, a back pressure ejector rod and a hydraulic cylinder bushing, the hydraulic cylinder bushing is fixedly arranged in the hydraulic cavity through the fourth pad, one end of the piston is arranged in the back pressure cavity and the other end is arranged in the hydraulic cylinder bushing, the piston can vertically move in the back pressure cavity and the hydraulic cavity, a plurality of back pressure ejector rods are fixedly arranged on the upper end of the piston, the back pressure ejector rods are correspondingly arranged in the back pressure holes, the upper ends of the back pressure ejector rods are in contact with the special-shaped ejector block, and the lower mold plate is further provided with a hydraulic hole, one end of the hydraulic hole is in communication with the hydraulic equipment outside, and the other end is in communication with the hydraulic cavity.

10. The aluminum alloy scroll back pressure forming die set structure of claim 9 wherein, The lower part of the hydraulic cavity is provided with a fifth pad, the fifth pad is fixedly arranged on the lower mold plate through a locking nut, the fifth pad abuts against below the hydraulic cylinder bushing to fix the position of the hydraulic cylinder bushing, a ejection hole is vertically arranged on the fifth pad, and an ejector rod is arranged in the ejection hole.

Images