Adjustable tool clamp for five-axis numerical control machining and control method of adjustable tool clamp

Abstract

The invention relates to the technical field of numerical control machining, and discloses an adjustable tool clamp for five-axis numerical control machining and a control method thereof.The adjustable tool clamp comprises a containing disc, the outer side wall of the containing disc is in threaded fit with a first annular plate, and the upper side of the first annular plate is in threaded fit with a second annular plate; and a plurality of first threaded rods are rotationally matched with the upper side of the second annular plate, the directions of threads on the two sides of each first threaded rod are opposite, sliding blocks are in threaded fit with the two sides of each first threaded rod, and a sliding plate is elastically and slidably matched with one side of each first threaded rod. According to the pressing blade clamping device, through the arranged arc-shaped plate, the L-shaped rod drives the arc-shaped plate to slide in the direction of the pressing blade under the action of the connecting plate, and the pressing blade is fixedly matched to the upper side of the placing disc through the inner side wall of the arc-shaped plate, so that the pressing blade clamping process is more convenient, and the workload of a user is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control machining, and in particular relates to an adjustable fixture for five-axis numerical control machining and a control method thereof. Background Art

[0002] The five-axis CNC machining center, also called the five-axis machining center, is a high-tech, high-precision machining center specifically used for machining complex surfaces.

[0003] The patent with announcement number CN103722418A discloses an adjustable tooling fixture for five-axis machining of impellers, which fixes the circular chassis on the machine tool platform through a boss, and the center positioning rod is fastened to the center hole on the circular chassis through its bottom, and an adjustable positioning block is installed. The clamping screw is screwed into the positioning block, and the opening size is adjusted according to the actual size of the impeller to be processed and the adjustment size scale line of the circular chassis. The clamping screw is tightened. At this time, the clamping screw is tightened, and the bottom of the screw is against the screw clamping surface, so that the upper end surface of the bottom block is clamped with the upper mating surface, thereby fixing the opening size and position of the adjustable positioning block, and putting the impeller to be processed into place so that the back plane fits on the top surface of the four adjustable positioning blocks, and tightening the locking nut. This fixes the impeller to be processed, and then subsequent five-axis machining is carried out.

[0004] However, in actual use, the staff needs to drive the bottom of the screw to press against the screw clamping surface, and then put in the impeller to be processed so that the back plane fits against the top surfaces of the four adjustable positioning blocks, and tighten the locking nut. In this way, the impeller to be processed is fixed, and then subsequent five-axis processing is carried out. This process has a complex structure and is difficult to install. It can only be clamped manually, which increases the workload of users. Summary of the invention

[0005] Based on the above deficiencies in the prior art, the technical problem solved by the present invention is to provide an adjustable tooling fixture for five-axis CNC machining and a control method thereof, so as to improve the stability of the L-shaped rod when sliding, make the blade clamping process more convenient, and reduce the workload of users.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: the present invention provides an adjustable tooling fixture for five-axis CNC machining, including a placing plate, the outer wall of the placing plate is threadedly matched with a first annular plate, the upper side of the first annular plate is threadedly matched with a second annular plate, the upper side of the second annular plate is rotatably matched with a plurality of first threaded rods, the threads on both sides of the first threaded rod are in opposite directions, both sides of the first threaded rod are threadedly matched with sliding blocks, one side of the first threaded rod is elastically and slidably matched with a sliding plate, one side of the sliding plate is elastically and slidably matched with two L-shaped rods, an arc plate and a connecting plate are fixedly matched between the two L-shaped rods, and a rotating plate is rotatably matched between one side of the connecting plate and one side of the sliding block; the second threaded rod is threadedly matched with the upper side of the placing plate, and the peripheral side of the second threaded rod is clamped with a pressure leaf.

[0007] Optionally, a first threaded hole is opened on the upper side of the placing plate, the lower end of the second threaded rod is threadedly engaged with the inside of the first threaded hole, the upper end of the second threaded rod is threadedly engaged with a nut, the bottom of the nut is attached to the upper side of the pressure leaf, and the inner wall of the arc plate is attached to the outer wall of the pressure leaf.

[0008] Optionally, an annular groove is provided on the upper side of the first annular plate, and a plurality of rubber protrusions are evenly distributed and fixed on the outer wall of the first annular plate, the inner wall of the annular groove is provided with a first internal thread, and the outer wall of the second annular plate is provided with a first external thread, and the first internal thread is threadably matched with the first external thread, and the outer wall of the placement plate is provided with a second external thread, and the inner wall of the first annular plate is provided with a second internal thread, and the second external thread is threadably matched with the second internal thread.

[0009] Optionally, the bottom of the placement plate is fixedly fitted with a base, the outer wall of the base is fixedly fitted with a plurality of clamping plates, a clamping slot is opened on the sliding plate, one end of the clamping plate is clamped with the clamping slot, and the upper side of the placement plate is fixedly fitted with an annular column.

[0010] Optionally, two guide columns are fixedly fitted on one side of the sliding plate, a first through hole is opened at one end of the guide column, a guide rod is slidably fitted inside the first through hole, and a first spring is fixedly fitted at one end of the guide column.

[0011] Optionally, a plurality of fixed blocks are fixedly engaged on the upper side of the second annular plate, a second through hole is opened on one side of the fixed block, one end of the first threaded rod is rotatably engaged in the interior of the second through hole, a servo motor is fixedly engaged on one side of the fixed block, one end of the first threaded rod is fixedly engaged on the output end of the servo motor, a second threaded hole is opened on one side of the sliding block, and the second threaded hole is threadably engaged with the first threaded rod.

[0012] Optionally, a plurality of guide grooves and a plurality of guide holes are provided on the upper side of the placement plate, adjacent guide holes are connected to the guide grooves, one end of the guide column is located inside the guide hole, and the sliding plate is located inside the guide groove.

[0013] Optionally, two third through holes are provided on the sliding plate, the L-shaped rod is slidably fitted inside the third through holes, and a second spring is fixedly fitted between one side of the sliding plate and one side of the connecting plate.

[0014] Optionally, one side of the sliding block is fixedly fitted with a first fixing rod, one side of the connecting plate is fixedly fitted with two second fixing rods, a fourth through hole and a fifth through hole are respectively provided at both ends of the rotating plate, the first fixing rod is located inside the fourth through hole, and the second fixing rod is located inside the fifth through hole.

[0015] The present invention also discloses a control method for an adjustable fixture for five-axis CNC machining, the steps of which are as follows: S1: placing the pressing blade, firstly threading the lower end of the second threaded rod into the inside of the placing plate, and sleeve the pressing blade on the circumference of the second threaded rod, and then screwing a nut onto the upper end of the second threaded rod, and fixing the pressing blade on the circumference of the second threaded rod through the nut; S2: Assemble the second annular plate, firstly, fit the lower end of the second annular plate into the annular groove through the first external thread and the first internal thread, the second annular plate is fixed into the first annular plate through the annular groove, and then the sliding plate is placed into the placement plate through the guide groove, at this time, the sliding plate is placed on the peripheral side of one end of the clamping plate through the clamping groove, and then the sliding plate is slid, the sliding plate slides on the L-shaped rod through the third through hole and compresses the first spring, the sliding plate drives the guide column to slide, and then the sliding plate is placed into the guide groove, and then the sliding plate is released, and the sliding plate drives one end of the guide column to slide into the guide hole under the elastic action of the first spring; S3: Fix the pressure blade. First, rotate the first threaded rod. The first threaded rod drives the two sliding blocks to slide. Since the directions of the threads on both sides of the first threaded rod are opposite, the two sliding blocks slide close to each other. The sliding block drives the connecting plate to slide through the rotating plate. The connecting plate drives the arc plate to slide through the L-shaped rod, and the pressure blade is positioned on the upper side of the placing plate through the inner side wall of the arc plate. Then the pressure blade can be debugged.

[0016] In summary, the adjustable fixture for five-axis CNC machining and the control method thereof of the present invention have at least the following beneficial effects: 1. The arc plate is set so that the L-shaped rod drives the arc plate to slide in the direction of the pressure leaf under the action of the connecting plate, and the pressure leaf is fixed on the upper side of the placement plate through the inner wall of the arc plate, making the process of clamping the pressure leaf more convenient and reducing the workload of the user.

[0017] 2. The third through hole is set so that the L-shaped rod can slide inside the third through hole under the action of the connecting plate, and the sliding direction of the L-shaped rod is guided by the third through hole, thereby reducing the problem of tilting of the L-shaped rod when sliding and improving the stability of the L-shaped rod when sliding.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] Figure 1 It is a structural schematic diagram of an adjustable fixture for five-axis CNC machining of the present invention; Figure 2 A bottom view of the adjustable fixture for five-axis CNC machining of the present invention; Figure 3 is a schematic structural diagram of a second threaded rod of the present invention; Figure 4 is a schematic structural diagram of the second annular plate of the present invention; Figure 5 It is a structural schematic diagram of the curved plate of the present invention; Figure 6 It is a schematic structural diagram of the sliding plate of the present invention.

[0021] In the figure: 100-base, 101-placing plate, 102-card plate, 103-annular column, 104-first threaded hole, 105-second threaded rod, 106-nut, 107-guide groove, 108-guide hole, 109-first annular plate, 110-rubber protrusion, 111-annular groove, 112-second annular plate, 113-guide column, 114-first through hole, 115-guide rod, 116-first spring, 117- Fixed block, 118-second through hole, 119-first threaded rod, 120-sliding block, 121-second threaded hole, 122-first fixed rod, 123-sliding plate, 124-third through hole, 125-L-shaped rod, 126-arc plate, 127-connecting plate, 128-second spring, 129-second fixed rod, 130-rotating plate, 131-fourth through hole, 132-fifth through hole, 133-slot, 134-pressure leaf. DETAILED DESCRIPTION

[0022] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings, which is a part of this specification and illustrates the principles of the present invention through examples. Other aspects, features and advantages of the present invention will become clear from the detailed description. In the referenced drawings, the same or similar components in different figures are represented by the same reference numerals.

[0023] like Figures 1 to 6 As shown, the adjustable tooling fixture for five-axis CNC machining of the present invention includes a placement plate 101, the outer wall of the placement plate 101 is threadedly matched with a first annular plate 109, the upper side of the first annular plate 109 is threadedly matched with a second annular plate 112, the upper side of the second annular plate 112 is rotatably matched with a plurality of first threaded rods 119, the threads on both sides of the first threaded rod 119 are in opposite directions, both sides of the first threaded rod 119 are threadedly matched with sliding blocks 120, one side of the first threaded rod 119 is elastically and slidably matched with a sliding plate 123, one side of the sliding plate 123 is elastically and slidably matched with two L-shaped rods 125, an arc plate 126 and a connecting plate 127 are fixedly matched between the two L-shaped rods 125, and a rotating plate 130 is rotatably matched between one side of the connecting plate 127 and one side of the sliding block 120.

[0024] The second threaded rod 105 is threadably engaged with the upper side of the placement plate 101 , and a pressure leaf 134 is snap-engaged on the circumferential side of the second threaded rod 105 .

[0025] The arc plate 126 is set so that the L-shaped rod 125 drives the arc plate 126 to slide in the direction of the pressure leaf 134 under the action of the connecting plate 127, and the pressure leaf 134 is fixed to the upper side of the placement plate 101 through the inner wall of the arc plate 126, so that the process of clamping the pressure leaf 134 is more convenient and the workload of the user is reduced.

[0026] In order to make the sliding process of the arc plate 126 on the side of the sliding plate 123 more stable, the following structure is used to improve it. Figure 1-6 As shown, the upper side of the placement plate 101 of this embodiment is provided with a first threaded hole 104, the lower end of the second threaded rod 105 is threadedly engaged inside the first threaded hole 104, the upper end of the second threaded rod 105 is threadedly engaged with a nut 106, the bottom of the nut 106 is attached to the upper side of the pressure leaf 134, and the inner side wall of the arc plate 126 is attached to the outer side wall of the pressure leaf 134. The upper side of the first annular plate 109 is provided with an annular groove 111, the inner side wall of the annular groove 111 is provided with a first internal thread, and the outer side wall of the second annular plate 112 is provided with a first external thread, and the first internal thread is threadedly engaged with the first external thread.

[0027] The outer wall of the placement plate 101 is provided with a second external thread, the inner wall of the first annular plate 109 is provided with a second internal thread, the outer wall of the first annular plate 109 is evenly fixed with a plurality of rubber protrusions 110, the second external thread is threadedly matched with the second internal thread, the bottom of the placement plate 101 is fixedly matched with a base 100, the outer wall of the base 100 is fixedly matched with a plurality of clamping plates 102, a clamping groove 133 is provided on the sliding plate 123, one end of the clamping plate 102 is clamped with the clamping groove 133, and the sliding plate 123 is slidably arranged in the guide groove 107, which is convenient on the one hand The sliding plate 123 slides inside the base 100 through the guide groove 107. On the other hand, the sliding direction of the sliding plate 123 is guided by the guide groove 107, which reduces the problem of the sliding plate 123 tilting when sliding. The upper side of the placement plate 101 is fixedly matched with the annular column 103, and one side of the sliding plate 123 is fixedly matched with two guide columns 113. One end of the guide column 113 is provided with a first through hole 114, and the inside of the first through hole 114 is slidably matched with a guide rod 115, and one end of the guide column 113 is fixedly matched with a first spring 116. Through the provision of the first spring 116, one end of the first spring 116 gives the sliding plate 123 an elastic force, and one side of the sliding plate 123 drives one end of the guide column 113 to always be inside the guide hole 108.

[0028] A plurality of fixed blocks 117 are fixedly fitted on the upper side of the second annular plate 112, a second through hole 118 is opened on one side of the fixed block 117, one end of the first threaded rod 119 is rotatably fitted inside the second through hole 118, a servo motor is fixedly fitted on one side of the fixed block 117, one end of the first threaded rod 119 is fixedly fitted on the output end of the servo motor, a second threaded hole 121 is opened on one side of the sliding block 120, and the second threaded hole 121 is threadably fitted with the first threaded rod 119.

[0029] A plurality of guide grooves 107 and a plurality of guide holes 108 are provided on the upper side of the placement plate 101, and adjacent guide holes 108 are connected to the guide grooves 107, one end of the guide column 113 is located inside the guide hole 108, and the sliding plate 123 is located inside the guide groove 107. Two third through holes 124 are provided on the sliding plate 123, and the L-shaped rod 125 is slidably fitted inside the third through hole 124. A second spring 128 is fixedly fitted between one side of the sliding plate 123 and one side of the connecting plate 127, a first fixing rod 122 is fixedly fitted on one side of the sliding block 120, and two second fixing rods 129 are fixedly fitted on one side of the connecting plate 127, and a fourth through hole 131 and a fifth through hole 132 are respectively provided at both ends of the rotating plate 130, the first fixing rod 122 is located inside the fourth through hole 131, and the second fixing rod 129 is located inside the fifth through hole 132.

[0030] When this embodiment is in use, the servo motor is first started, and the servo motor drives the two sliding blocks 120 to slide through the first threaded rod 119. Since the directions of the threads on both sides of the first threaded rod 119 are opposite, the two sliding blocks 120 approach each other, and the sliding block 120 drives the connecting plate 127 to slide through the rotating plate 130. The connecting plate 127 drives the L-shaped rod 125 to slide inside the third through hole 124. The L-shaped rod 125 drives the arc plate 126 to slide in the direction of the pressure leaf 134, and the pressure leaf 134 is fixed to the upper side of the placement plate 101 through the inner side wall of the arc plate 126.

[0031] The present invention uses the third through hole 124 to allow the L-shaped rod 125 to slide inside the third through hole 124 under the action of the connecting plate 127, and guides the sliding direction of the L-shaped rod 125 through the third through hole 124, thereby reducing the problem of tilting of the L-shaped rod 125 when sliding and improving the stability of the L-shaped rod 125 when sliding.

[0032] The control method of the adjustable fixture for five-axis CNC machining of the present invention comprises the following steps: S1. Place the pressing blade 134. First, thread the lower end of the second threaded rod 105 into the inside of the placing plate 101, and sleeve the pressing blade 134 around the circumference of the second threaded rod 105. Then, screw the nut 106 onto the upper end of the second threaded rod 105, and fix the nut 106 onto the circumference of the second threaded rod 105. S2, assemble the second annular plate 112, firstly, fit the lower end portion of the second annular plate 112 into the annular groove 111 through the first external thread and the first internal thread, the second annular plate 112 is fixed into the first annular plate 109 through the annular groove 111, and then the sliding plate 123 is placed into the inside of the placing plate 101 through the guide groove 107, at this time, the sliding plate 123 is placed on the peripheral side of one end of the clamping plate 102 through the clamping groove 133, and then the sliding plate 123 is slid, the sliding plate 123 slides on the L-shaped rod 125 through the third through hole 124 and compresses the first spring 116, the sliding plate 123 drives the guide column 113 to slide, and then the sliding plate 123 is placed in the inside of the guide groove 107, and then the sliding plate 123 is released, and the sliding plate 123 drives one end of the guide column 113 to slide into the inside of the guide hole 108 under the elastic action of the first spring 116; S3. Fix the pressure leaf 134. First, rotate the first threaded rod 119. The first threaded rod 119 drives the two sliding blocks 120 to slide. Since the directions of the threads on both sides of the first threaded rod 119 are opposite, the two sliding blocks 120 slide close to each other. The sliding block 120 drives the connecting plate 127 to slide through the rotating plate 130. The connecting plate 127 drives the arc plate 126 to slide through the L-shaped rod 125, and the pressure leaf 134 is positioned on the upper side of the placement plate 101 through the inner side wall of the arc plate 126. Then the pressure leaf 134 can be debugged.

[0033] The above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present invention, and these improvements and changes are also regarded as the protection scope of the present invention.

Claims

1. An adjustable fixture for five-axis CNC machining, characterized in that: include: A placement plate (101), wherein the outer wall of the placement plate (101) is threadedly engaged with a first annular plate (109), the upper side of the first annular plate (109) is threadedly engaged with a second annular plate (112), the upper side of the second annular plate (112) is rotatably engaged with a plurality of first threaded rods (119), the threads on both sides of the first threaded rod (119) are in opposite directions, both sides of the first threaded rod (119) are threadedly engaged with sliding blocks (120), one side of the first threaded rod (119) is elastically and slidably engaged with a sliding plate (123), one side of the sliding plate (123) is elastically and slidably engaged with two L-shaped rods (125), an arc plate (126) and a connecting plate (127) are fixedly engaged between the two L-shaped rods (125), and a rotating plate (130) is rotatably engaged between one side of the connecting plate (127) and one side of the sliding block (120); A second threaded rod (105) is threadably engaged with the upper side of the placement plate (101), and a pressure leaf (134) is snap-engaged on the circumference of the second threaded rod (105).

2. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: A first threaded hole (104) is provided on the upper side of the placement plate (101); the lower end of the second threaded rod (105) is threadedly engaged with the interior of the first threaded hole (104); the upper end of the second threaded rod (105) is threadedly engaged with a nut (106); the bottom of the nut (106) is attached to the upper side of the pressure blade (134); and the inner wall of the arc plate (126) is attached to the outer wall of the pressure blade (134).

3. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: An annular groove (111) is provided on the upper side of the first annular plate (109); a plurality of rubber protrusions (110) are evenly distributed and fixedly fitted on the outer side wall of the first annular plate (109); a first internal thread is provided on the inner side wall of the annular groove (111); a first external thread is provided on the outer side wall of the second annular plate (112); the first internal thread is threadably fitted with the first external thread; a second external thread is provided on the outer side wall of the placement plate (101); a second internal thread is provided on the inner side wall of the first annular plate (109); the second external thread is threadably fitted with the second internal thread.

4. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: The bottom of the placement plate (101) is fixedly engaged with a base (100), the outer side wall of the base (100) is fixedly engaged with a plurality of clamping plates (102), a clamping groove (133) is provided on the sliding plate (123), one end of the clamping plate (102) is clamped and engaged with the clamping groove (133), and an annular column (103) is fixedly engaged with the upper side of the placement plate (101).

5. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: Two guide columns (113) are fixedly engaged on one side of the sliding plate (123); a first through hole (114) is provided at one end of the guide column (113); a guide rod (115) is slidably engaged inside the first through hole (114); and a first spring (116) is fixedly engaged at one end of the guide column (113).

6. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: A plurality of fixed blocks (117) are fixedly engaged on the upper side of the second annular plate (112); a second through hole (118) is provided on one side of the fixed block (117); one end of the first threaded rod (119) is rotatably engaged inside the second through hole (118); a servo motor is fixedly engaged on one side of the fixed block (117); one end of the first threaded rod (119) is fixedly engaged on the output end of the servo motor; a second threaded hole (121) is provided on one side of the sliding block (120); the second threaded hole (121) is threadably engaged with the first threaded rod (119).

7. The adjustable fixture for five-axis CNC machining according to claim 5, characterized in that: A plurality of guide grooves (107) and a plurality of guide holes (108) are provided on the upper side of the placement plate (101); adjacent guide holes (108) are connected to the guide grooves (107); one end of the guide column (113) is located inside the guide hole (108); and the sliding plate (123) is located inside the guide groove (107).

8. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: The sliding plate (123) is provided with two third through holes (124), the L-shaped rod (125) is slidably fitted inside the third through holes (124), and a second spring (128) is fixedly fitted between one side of the sliding plate (123) and one side of the connecting plate (127).

9. The adjustable fixture for five-axis CNC machining according to claim 1, characterized in that: A first fixing rod (122) is fixedly fitted on one side of the sliding block (120), two second fixing rods (129) are fixedly fitted on one side of the connecting plate (127), a fourth through hole (131) and a fifth through hole (132) are respectively provided at both ends of the rotating plate (130), the first fixing rod (122) is located inside the fourth through hole (131), and the second fixing rod (129) is located inside the fifth through hole (132).

10. A control method for an adjustable fixture for five-axis CNC machining according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1: placing the pressure blade (134), firstly threading the lower end of the second threaded rod (105) into the interior of the placement plate (101), and sleeve the pressure blade (134) on the circumference of the second threaded rod (105), then screwing the nut (106) onto the upper end of the second threaded rod (105), and fixing the nut (106) on the circumference of the second threaded rod (105); S2: Assemble the second annular plate (112). First, the lower end of the second annular plate (112) is threadedly engaged with the inside of the annular groove (111) through the first external thread and the first internal thread. The second annular plate (112) is fixed inside the first annular plate (109) through the annular groove (111). Then, the sliding plate (123) is placed inside the placement plate (101) through the guide groove (107). At this time, the sliding plate (123) is placed on the peripheral side of one end of the clamping plate (102) through the clamping groove (133). Then, the sliding plate (123) is slid, the sliding plate (123) slides on the L-shaped rod (125) through the third through hole (124) and compresses the first spring (116), the sliding plate (123) drives the guide column (113) to slide, and then the sliding plate (123) is placed inside the guide groove (107), and then the sliding plate (123) is released, and the sliding plate (123) drives one end of the guide column (113) to slide into the inside of the guide hole (108) under the elastic action of the first spring (116); S3: Fix the pressure leaf (134). First, rotate the first threaded rod (119). The first threaded rod (119) drives the two sliding blocks (120) to slide. Since the threads on both sides of the first threaded rod (119) are in opposite directions, the two sliding blocks (120) slide close to each other. The sliding blocks (120) drive the connecting plate (127) to slide through the rotating plate (130). The connecting plate (127) drives the arc plate (126) to slide through the L-shaped rod (125). The pressure leaf (134) is positioned on the upper side of the placement plate (101) through the inner side wall of the arc plate (126). Then, the pressure leaf (134) can be debugged.

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