Riveting device capable of switching pressure heads

Abstract

The utility model relates to the technical field of riveting, and discloses a riveting device capable of switching pressure heads, which comprises a press mechanism, the output end of the press mechanism is connected with a riveting mechanism, the riveting mechanism comprises a supporting seat, at least two riveting heads parallel to the Z-axis direction are arranged in the supporting seat in a penetrating manner, and the riveting heads are connected with the output end of the press mechanism. An insertion hole is also formed in the supporting seat; one end of the riveting head extends to the outer side of the supporting seat, and the other end of the riveting head can move into the insertion hole; when the riveting heads abut against the inserting plates in the inserting holes, the riveting heads conduct riveting work at the riveting point positions along with downward pressing of the pressing machine mechanism, when one ends of the riveting heads can move into the inserting holes, the riveting heads are in a floating state and do not participate in riveting work, and when the riveting mechanism conducts downward pressing every time, only one riveting head participates in riveting work. Through the structure, the condition that a product needs to be riveted for several times can be met, the equipment cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of riveting and pressing, in particular to a riveting and pressing device with a switchable pressing head. Background Art

[0002] The riveting process is a process for connecting two or more workpieces. In the prior art, it generally uses a press to drive a pressure head to press rivets or rivet sleeves into the workpieces to connect two or more workpieces; this process is usually used to connect metals, plastics or composite materials, and can be used to connect different materials; the riveting process has the advantages of firm connection, high reliability, corrosion resistance, etc., so it has been widely used in aerospace, automobile manufacturing, construction and other fields.

[0003] The existing riveting devices basically consist of a press machine working with one or more pressing heads to perform riveting work simultaneously. However, when two or more riveting points of a product need to be riveted in batches, the existing riveting devices are not suitable. If a corresponding number of presses are used to drive each pressing head separately, the cost of the equipment will increase. Therefore, it is urgent to design a riveting device with switchable pressing heads to ensure that only one pressing head will work when the press is pressed down, that is, only one riveting point is riveted each time, so as to meet the situation that some products need to be riveted in batches. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a riveting device with switchable pressing heads. By adjusting the position of the plug plate in the plug hole, it is ensured that when the riveting mechanism is pressed down, only one riveting pressing head will work, and the other riveting pressing heads can float, that is, only one point is riveted each time, so as to prevent two or more points from being riveted at the same time with uneven force, thereby avoiding affecting product quality.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A riveting device with switchable pressing heads comprises a pressing mechanism, wherein the output end of the pressing mechanism is connected to a riveting mechanism that can move along the Z-axis direction, wherein the riveting mechanism comprises a support seat connected to the pressing mechanism, wherein at least two riveting pressing heads parallel to the Z-axis direction are penetrated inside the support seat, and insertion holes corresponding to the number and positions of the riveting pressing heads are also opened inside the support seat; one end of the riveting pressing head extends to the outside of the support seat, and the other end can be moved into the insertion hole; an insertion plate that can abut against the riveting pressing head is movably penetrated inside the insertion hole, and each time the riveting mechanism is pressed down, one and only one of the riveting pressing heads abuts against the insertion plate.

[0007] In a preferred embodiment of the utility model, the support seat includes a mounting seat, one end of the mounting seat is provided with a base connected to the press mechanism, and the other end is provided with a cover plate for limiting; the socket is enclosed between the base and the mounting seat, the mounting seat is provided with a mounting hole for installing the riveting head, and the cover plate is provided with a bottom hole connected to the mounting hole; one end of the riveting head passes through the bottom hole to the outside of the support seat, and the other end can move along the mounting hole to the socket.

[0008] In a preferred embodiment of the utility model, a return spring is arranged at one end of the mounting hole close to the insertion hole, and the return spring is sleeved on the upper part of the riveting head.

[0009] In a preferred embodiment of the utility model, a support plate is fixedly installed on one side of the mounting seat, a telescopic component for driving the plug plate to move along the plug hole is arranged on the support plate, and an output end of the telescopic component is connected to the plug plate.

[0010] In a preferred embodiment of the utility model, the plug plate includes a plate body, one end of the plate body is connected to the output end of the telescopic component, and the other end is provided with a notch, and one end of the riveting head can be moved into the notch.

[0011] In a preferred embodiment of the utility model, the press mechanism includes a frame, a press body is mounted on the frame, the output end of the press body is connected to a support via a buffer mechanism, the riveting mechanism is arranged below the support, and an adjustment mechanism for adjusting the centering position of the riveting mechanism is also arranged between the support and the riveting mechanism.

[0012] In a preferred embodiment of the utility model, the buffer mechanism includes a connecting ring connected to the support, and a top plate is fixedly installed on the top of the connecting ring; the output end of the press body extends into the connecting ring, and the lower part of the output end of the press body is connected to the connecting ring through a spherical bearing, and the upper part is connected to the top plate through a buffer spring.

[0013] In a preferred embodiment of the utility model, a connecting plate is installed on the top of the support seat, two L-shaped plates are arranged opposite to each other at the bottom of the adjustment mechanism, and the connecting plate can be embedded between the two L-shaped plates. Beneficial Effects

[0014] (1) In the utility model, when the riveting head abuts against the plug plate in the socket, as the press mechanism is pressed down, the riveting head performs riveting work at the riveting point. When one end of the riveting head can move into the socket, the riveting head is in a floating state and does not participate in the riveting work. Each time the riveting mechanism is pressed down, only one riveting head participates in the riveting work. This structure can meet the situation where the product needs to be riveted in batches, reduce equipment costs, and improve product quality.

[0015] (2) With respect to the above-mentioned plug plate, its position in the plug hole is adjusted by a telescopic component to ensure that when the riveting mechanism presses down each time, only one riveting head is involved in the riveting work.

[0016] (3) In the utility model, under the action of the spherical bearing, it can be ensured that the riveting head can still be pressed down along the axial direction even if it is subjected to radial force, and when the riveting head contacts the product, the kinetic energy generated by the collision can be absorbed by the buffer spring, making the overall structure more reliable and stable.

[0017] (4) In the present invention, the cooperation between the L-shaped plate and the connecting plate can be used to quickly replace the riveting mechanism, thereby improving the maintenance and replacement efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the positions of the buffer mechanism, the adjustment mechanism and the riveting mechanism of the utility model;

[0020] Figure 3 It is a schematic diagram of the axonometric structure of the riveting mechanism of the utility model;

[0021] Figure 4 It is a schematic diagram of the internal structure of the riveting mechanism of the utility model;

[0022] Figure 5 It is a schematic diagram of the internal structure of the mounting seat of the utility model;

[0023] Figure 6 It is a structural schematic diagram of the riveting head of the utility model;

[0024] Figure 7 It is a schematic diagram of the position between the riveting head, the plug hole and the plug plate of the utility model;

[0025] Figure 8 It is a structural schematic diagram of the adjustment mechanism of the utility model;

[0026] Fig. 9 It is a schematic diagram of the structure of the keyway and the guide key of the utility model;

[0027] Fig.10 It is a structural schematic diagram of the second adjustment plate of the utility model;

[0028] Fig.11 It is a structural schematic diagram of the pin rod of the utility model;

[0029] Fig.12 It is a structural schematic diagram of the buffer mechanism of the utility model;

[0030] Fig.13 It is a schematic diagram of the gas circuit structure of the utility model;

[0031] Among them, 1. press mechanism; 11. frame; 12. press body; 13. support; 14. slide rail assembly; 2. buffer mechanism; 21. connecting ring; 22. top plate; 23. spherical bearing; 24. buffer spring; 3. adjustment mechanism; 31. first adjustment plate; 32. second adjustment plate; 33. adjustment seat; 34. L-shaped plate; 35. oblong hole; 36. keyway; 37. guide key; 4. riveting mechanism; 41. support plate; 42. support seat; 421. mounting seat; 422. base; 423. cover plate; 43. mounting hole; 44. plug hole; 45. bottom hole; 46. riveting head; 47. reset spring; 48. plug plate; 481. plate body; 482. notch; 49. telescopic assembly; 491. solenoid valve; 5. connecting plate; 6. pin rod. DETAILED DESCRIPTION

[0032] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0033] like Figure 1-Figure 2 As shown, a riveting device with a switchable pressing head comprises a pressing mechanism 1, the output end of the pressing mechanism 1 is connected to a riveting mechanism 4 which can be lifted and lowered along the Z-axis direction, and a buffer mechanism 2 and an adjustment mechanism 3 are arranged between the riveting mechanism 4 and the output end of the pressing mechanism 1; the buffer mechanism 2 can ensure that the riveting mechanism 4 can still be pressed down along the axial direction even if subjected to radial force, and when the riveting mechanism 4 contacts with the product, the kinetic energy generated by the collision can also be absorbed by the buffer mechanism 2, so that the overall structure is more reliable and stable; the adjustment mechanism 3 can be used to adjust the centering position of the riveting mechanism 4 to ensure that the pressing head is well aligned with the riveting point of the product.

[0034] As mentioned above, the press mechanism 1 includes a frame 11 , on which a press body 12 is mounted, an output end of the press body 12 is connected to a support 13 via a buffer mechanism 2 , and the riveting mechanism 4 is disposed below the support 13 .

[0035] The frame 11 preferably adopts a C-type seat structure, and the press body 12 is a linear module capable of outputting linear motion, and a servo electric cylinder is preferably used here; and a slide rail assembly 14 is used between the support 13 and the frame 11 to ensure that the riveting mechanism 4 can maintain movement along the Z-axis direction when working.

[0036] Among them, the support 13 adopts an L-shaped structure, and the slide rail assembly 14 includes a guide rail and a slider that cooperate with each other. The guide rail is fixedly installed on the inner side of the frame 11 and is parallel to the Z-axis direction with the output end of the press body 12; the slider is fixedly installed on one side of the support 13 parallel to the guide rail, and the slider is slidably connected to the guide rail, that is, through the mutual sliding cooperation between the slider and the guide rail, the moving direction of the riveting mechanism 4 can be ensured to be smooth and accurate.

[0037] like Figure 1-Figure 2 , Fig.12 As shown, the buffer mechanism 2 includes a connecting ring 21 connected to the support 13, and a top plate 22 is fixedly installed on the top of the connecting ring 21; the output end of the press body 12 extends into the connecting ring 21, and the lower part of the output end of the press body 12 is connected to the connecting ring 21 through a spherical bearing 23, and the upper part is connected to the top plate 22 through a buffer spring 24.

[0038] As mentioned above, the output end of the press body 12 adopts a connecting rod with a stepped shaft structure, the inner and outer rings of the spherical bearing 23 can swing within a certain angle range, and the outer ring of the spherical bearing 23 is fixedly installed at the bottom of the inner side of the connecting ring 21, and the inner ring is fixedly connected to the end of the connecting rod; the lower part of the connecting rod also has a boss, and a buffer spring 24 is installed between the boss and the top plate 22. The number of the buffer springs 24 is provided in plurality, and they are distributed in a circular array around the axis of the connecting rod.

[0039] Specifically, after the connecting rod is extended into the interior of the connecting ring 21 and connected with the spherical bearing 23, the buffer spring 24 is arranged vertically on the boss, and then the top plate 22 is covered on the top of the connecting ring 21 to complete the limiting work of the connecting rod; based on this, it can be ensured that the riveting mechanism 4 can still be pressed down along the axial direction even if it is subjected to radial force, and when the riveting mechanism 4 contacts with the product, the kinetic energy generated by the collision can also be absorbed by the buffer spring 24, making the overall structure more reliable and stable.

[0040] like Figure 1-Figure 2 , Figure 8-Figure 10 As shown, the adjustment mechanism 3 includes a first adjustment plate 31 installed at the bottom of the support 13, the bottom of the first adjustment plate 31 is connected to the second adjustment plate 32, the second adjustment plate 32 is connected to the riveting mechanism 4, and the first adjustment plate 31 is connected to the second adjustment plate 32 and the support 13 through an oblong hole 35 structure.

[0041] An adjustment seat 33 for adjusting the horizontal position of the first adjustment plate 31 is installed at the bottom of the support 13 , and an adjustment seat 33 for adjusting the horizontal position of the second adjustment plate 32 is installed at the bottom of the first adjustment plate 31 , and the two adjustment seats 33 are located on two adjacent sides.

[0042] As mentioned above, the length directions of the oblong holes 35 on the first adjustment plate 31 and the second adjustment plate 32 are perpendicular to each other, and an adjusting screw is screwed on the adjustment seat 33. As the adjusting screw is screwed in or out, the position of the corresponding adjustment plate can be adjusted along the corresponding oblong hole 35, ultimately ensuring that the riveting mechanism 4 and the riveting point are well aligned.

[0043] Among them, the first adjustment plate 31 is also connected to the second adjustment plate 32 and the support 13 through a sliding key to play a guiding role; the first adjustment plate 31, the second adjustment plate 32 and the support 13 are all provided with key slots 36, and corresponding guide keys 37 are embedded in the corresponding key slots 36. The guide keys 37 are double-round flat keys, and the length of the guide keys 37 is less than the length of the key slots 36 to ensure that they can slide.

[0044] like Figure 2-Figure 7 As shown, the riveting mechanism 4 includes a support seat 42 connected to the press mechanism 1, and at least two riveting heads 46 parallel to the Z-axis direction are penetrated inside the support seat 42, and sockets 44 corresponding to the number and positions of the riveting heads 46 are also opened in the support seat 42; one end of the riveting head 46 extends to the outside of the support seat 42, and the other end can be moved into the socket 44; a plug plate 48 that can abut against the riveting head 46 is movably penetrated inside the socket 44, and each time the riveting mechanism 4 is pressed down, only one riveting head 46 abuts against the plug plate 48.

[0045] When the riveting head 46 abuts against the plug plate 48 in the socket 44, as the press body 12 is pressed down, the riveting head 46 performs riveting work at the riveting point; when one end of the riveting head 46 can move into the socket 44, the riveting head is in a floating state and does not participate in the riveting work, and each time the press body 12 is pressed down, one and only one riveting head 46 participates in the riveting work; this structure can meet the situation where the product needs to be riveted in batches, reduce equipment costs, and improve product quality.

[0046] As mentioned above, the support seat 42 includes a mounting seat 421, one end of which is provided with a base 422 connected to the press mechanism 1, and the other end is provided with a cover plate 423 for limiting; the socket 44 is enclosed and formed between the base 422 and the mounting seat 421, and the mounting seat 421 is provided with a mounting hole 43 for installing a riveting head 46, and the cover plate 423 is provided with a bottom hole 45 connected to the mounting hole 43; one end of the riveting head 46 passes through the bottom hole 45 to the outside of the support seat 42, and the other end can move along the mounting hole 43 to the socket 44.

[0047] The mounting hole 43 adopts a stepped hole structure, and its upper end diameter is smaller than the lower end diameter. At the same time, the diameter of the bottom hole 45 is also smaller than the lower end diameter of the mounting hole 43; the riveting head 46 adopts a stepped shaft structure and can move axially in the mounting hole 43; a return spring 47 is provided at one end of the mounting hole 43 close to the insertion hole 44, and the return spring 47 is sleeved on the upper part of the riveting head 46.

[0048] After the riveting head 46 is installed into the mounting hole 43 from the bottom of the mounting seat 421, the cover plate 423 is fixed to the bottom of the mounting seat 421, while allowing the riveting head 46 to move axially, it can also be ensured that it will not fall off, that is, the cover plate 423 plays a limiting role here.

[0049] Among them, when the riveting head 46 moves up along the axial direction, it will squeeze the reset spring 47 to compress it and store elastic potential energy. After the working riveting head 46 completes the riveting work, the pressing mechanism 1 moves up. Under the action of the reset spring 47, the riveting head 46 with one end located in the socket 44 returns to the mounting hole 43 again, avoiding jamming and affecting the normal sliding of the plug plate 48.

[0050] Furthermore, a support plate 41 is fixedly mounted on one side of the mounting seat 421 , and a telescopic component 49 for driving the plug plate 48 to move along the plug hole 44 is provided on the support plate 41 , and an output end of the telescopic component 49 is connected to the plug plate 48 .

[0051] The telescopic component 49 preferably adopts a cylinder. As the output end of the cylinder is extended and retracted, the position of the corresponding plug plate 48 in the plug hole 44 can be adjusted, that is, the corresponding mounting hole 43 is blocked as needed to ensure that the riveting head 46 in the mounting hole 43 participates in the riveting work.

[0052] As mentioned above, the plug plate 48 includes a plate body 481 , one end of which is connected to the output end of the telescopic assembly 49 , and the other end of which is provided with a notch 482 , and one end of the riveting head 46 can move into the notch 482 .

[0053] Driven by the telescopic assembly 49, the plug plate 48 can move along the plug hole 44; driven by the press mechanism 1, the riveting mechanism 4 is pressed down, and the riveting head 46 contacts the product. At this time, if the plate body 481 of the plug plate 48 moves to the top of the mounting hole 43, the upper end of the riveting head 46 in the mounting hole 43 abuts against the plate body 481, and with the support of the plug plate 48, the riveting head 46 participates in the riveting work; if the notch 482 of the plug plate 48 moves to the top of the mounting hole 43, the riveting head 46 in the mounting hole 43 can float into the notch 482 and does not participate in the riveting work.

[0054] like Fig.11As shown, a connecting plate 5 is installed on the top of the support seat 42 , and two L-shaped plates 34 are arranged opposite to each other at the bottom of the adjustment mechanism 3 , and the connecting plate 5 can be embedded between the two L-shaped plates 34 .

[0055] The two L-shaped plates 34 are relatively fixedly installed at the bottom of the second adjustment plate 32, and form a mounting groove for the connecting plate 5 to be inserted; a limit plate is also provided on one side of the second adjustment plate 32 to realize the positioning of the connecting plate 5; and in order to prevent the connecting plate 5 from escaping from the mounting groove during operation, a pin rod 6 is also vertically penetrated on the connecting plate 5, one end of the pin rod 6 can pass through the second adjustment plate 32 and can achieve self-locking through an elastic pin, thereby completing the relative locking between the connecting plate 5 and the second adjustment plate 32.

[0056] like Figure 1-Figure 12 As shown, two riveting heads 46 are provided, that is, two corresponding mounting holes 43, plug holes 44, bottom holes 45, return springs 47, plug plates 48 and telescopic components 49 are provided. Since the telescopic components 49 adopt cylinders, the two cylinders can be controlled by a solenoid valve 491 through different air pipe connection methods; when one of the telescopic components 49 retracts, the other telescopic component 49 extends; in this way, it is ensured that when the solenoid valve 491 fails, only one riveting head 46 is involved in the riveting work at the same time.

[0057] Working principle:

[0058] With the support of the frame 11, the press body 12 is pressed down, driving the riveting mechanism 4 to be pressed down as a whole; one of the telescopic components 49 drives the corresponding plug plate 48 to extend, and the corresponding riveting head 46 is blocked by the plate body 481 of the extended plug plate 48, and cannot float to participate in the riveting work; the other telescopic component 49 drives the corresponding plug plate 48 to retract, and the corresponding riveting head 46 can pass through the notch 482 and float under the action of the reset spring 47 without participating in the riveting work; when the pressure output by the press body 12 reaches the preset value, the riveting mechanism 4 moves up, and the two riveting heads 46 change the floating state, and continue to perform the riveting work at a single point. After two rivetings are completed, the press body 12 moves up and the riveting process ends.

[0059] In summary, this riveting device is switched by means of PLC program control, and two cylinders are controlled by a solenoid valve 491, and the extension and retraction gas paths of the two cylinders are opposite (refer to Fig.13 ), the action of the cylinder is used to control whether the riveting head 46 can float, and the riveting head 46 is adjusted and aligned in the X-axis and Y-axis directions through the adjustment mechanism 3 to ensure that the riveting head 46 and the riveting point of the workpiece are well aligned.

[0060] Just put the product on the tooling and press the start button, the equipment will run automatically, the tooling will automatically clamp the product, and the disc will rotate the tooling to the riveting station. The press starts working and rivets the product. The pressure and displacement fed back by the press are used to determine whether the riveting is in place. After two riveting operations, the disc will rotate the tooling out and take out the product.

[0061] The device can ensure that only one riveting head 46 is in working state at the same time, and other riveting heads 46 can float, and only one point is riveted at a time to prevent uneven force from being applied to two or more points at the same time, which affects product quality. The whole process only requires the product to be placed in the tooling and the start button to be pressed. The degree of automation is very high, and the efficiency of loading and unloading is very high; by optimizing the speed and output force of the press, the height of the riveting points of each product after riveting can be ensured to be basically consistent, and the product will not be damaged during the process; the position accuracy of the tooling and the riveting head 46 is high, which can meet the position accuracy requirements of the product at the riveting station; the whole set of equipment is generally added as a separate module to one or more lines, which can well realize the riveting function. Physical equipment has been manufactured, and the efficiency, accuracy, stability, etc. have been verified.

[0062] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A riveting device with a switchable pressing head, comprising a pressing mechanism (1), wherein an output end of the pressing mechanism (1) is connected to a riveting mechanism (4) that can move along the Z-axis direction, Features: The riveting mechanism (4) comprises a support seat (42) connected to the press mechanism (1), at least two riveting heads (46) parallel to the Z-axis direction are inserted into the support seat (42), and the support seat (42) is also provided with insertion holes (44) corresponding to the number and positions of the riveting heads (46); One end of the riveting head (46) extends to the outside of the support seat (42), and the other end can be moved into the insertion hole (44); a plug plate (48) capable of abutting against the riveting head (46) is movably provided inside the insertion hole (44), and each time the riveting mechanism (4) is pressed down, only one of the riveting heads (46) abuts against the plug plate (48).

2. The riveting device with a switchable pressing head according to claim 1, Features: The support seat (42) comprises a mounting seat (421), one end of the mounting seat (421) is provided with a base (422) connected to the press mechanism (1), and the other end is provided with a cover plate (423) for limiting position; The insertion hole (44) is formed between the base (422) and the mounting seat (421); a mounting hole (43) for mounting the riveting head (46) is provided on the mounting seat (421); and a bottom hole (45) communicating with the mounting hole (43) is provided on the cover plate (423); One end of the riveting head (46) passes through the bottom hole (45) to the outside of the support seat (42), and the other end can move along the mounting hole (43) into the insertion hole (44).

3. The riveting device with a switchable pressing head according to claim 2, Features: A return spring (47) is provided at one end of the mounting hole (43) close to the insertion hole (44), and the return spring (47) is sleeved on the upper part of the riveting head (46).

4. The riveting device with a switchable pressing head according to claim 3, Features: A support plate (41) is fixedly mounted on one side of the mounting seat (421), and a telescopic component (49) is provided on the support plate (41) for driving the plug plate (48) to move along the plug hole (44), and an output end of the telescopic component (49) is connected to the plug plate (48).

5. The riveting device with a switchable pressing head according to claim 4, Features: The plug plate (48) comprises a plate body (481), one end of the plate body (481) is connected to the output end of the telescopic assembly (49), and the other end is provided with a notch (482), and one end of the riveting head (46) can move into the notch (482).

6. The riveting device with a switchable pressing head according to claim 1, Features: The press mechanism (1) comprises a frame (11), a press body (12) is mounted on the frame (11), an output end of the press body (12) is connected to a support (13) via a buffer mechanism (2), the riveting mechanism (4) is arranged below the support (13), and an adjustment mechanism (3) for adjusting the centering position of the riveting mechanism (4) is also arranged between the support (13) and the riveting mechanism (4).

7. The riveting device with a switchable pressing head according to claim 6, Features: The buffer mechanism (2) comprises a connecting ring (21) connected to the support (13), and a top plate (22) is fixedly mounted on the top of the connecting ring (21); The output end of the press body (12) extends into the connecting ring (21), and the lower part of the output end of the press body (12) is connected to the connecting ring (21) via a spherical bearing (23), and the upper part is connected to the top plate (22) via a buffer spring (24).

8. The riveting device with a switchable pressing head according to claim 6, Features: A connecting plate (5) is installed on the top of the support seat (42), two L-shaped plates (34) are arranged opposite to each other at the bottom of the adjustment mechanism (3), and the connecting plate (5) can be embedded between the two L-shaped plates (34).

Images