Aluminum alloy end spherical surface grinding device

Abstract

The invention relates to the technical field of aluminum alloy polishing, in particular to an aluminum alloy end spherical surface polishing device which comprises a polishing table, a material conveying mechanism and a separation mechanism, a connecting table is fixedly connected to the polishing table, and polishing assemblies are arranged on the connecting table and the polishing table. The material conveying mechanism is used for conveying workpieces to the grinding assembly for grinding operation, uniform distribution of the workpieces is facilitated, accumulation is avoided, and it is ensured that the workpieces move according to a preset path, and the separation mechanism is used for intermittently separating and feeding the workpieces on the material conveying mechanism. According to the separation mechanism, through the connecting strips symmetrically arranged above the connecting table in a staggered mode and the separation rods symmetrically arranged on the connecting strips, intermittent separation feeding of the workpieces can be achieved, interference between the workpieces is reduced, the waiting time between the workpieces is shortened, the grinding process is smoother, and therefore the overall production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy grinding, in particular to a device for grinding the spherical surface of an aluminum alloy end. Background Art

[0002] Aluminum alloys, based on aluminum with a certain amount of other alloying elements, are the most widely used nonferrous structural materials in industry. While aluminum alloys offer advantages such as light weight, high strength, and excellent corrosion resistance, processing processes such as casting, forging, and cutting can produce burrs, oxide layers, weld slag, and other processing marks on the spherical surfaces of the endpieces. These defects not only affect the appearance of the workpiece but can also adversely affect subsequent assembly and operation. Polishing effectively removes these surface defects, resulting in a smoother, flatter workpiece surface.

[0003] Aluminum alloys are used in aluminum cosmetic packaging, typically as product covers or accessories. These covers typically feature a spherical top and a hollow interior. During polishing, they must be secured to a fixture of a specific size and then polished with a grinding wheel until the spherical end is flat and smooth. Compared to other metals, aluminum alloys have lower hardness and elastic modulus, meaning they are more susceptible to plastic deformation when subjected to the same external force. Because polishing equipment generates a certain degree of vibration during operation, workpieces can collide during transportation due to vibration, inertia, or uncoordinated mechanical movement. The softness of aluminum alloys can cause localized dents on the spherical surface or edge deformation. These localized dents or edge deformations can affect the workpiece's sealing, assembly accuracy, and appearance. For product packaging, these defects can lead to product leakage or assembly difficulties. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for grinding the spherical surface of an aluminum alloy end portion to solve the problems raised by the above-mentioned background technology.

[0005] The technical solution adopted by the present application to solve the technical problem is: a device for grinding the spherical surface of an aluminum alloy end, comprising: a grinding table, a connecting table fixedly connected to the grinding table, a grinding assembly provided on the connecting table and the grinding table, and further comprising: A feeding mechanism is provided on the connecting platform, and comprises a square column fixedly provided above the grinding platform, wherein a through slot is provided through the square column, and a feeding slot is further provided on the square column, wherein the feeding slot and the through slot are connected to each other, and the feeding mechanism is used to feed the workpiece to the grinding assembly for grinding operation; The separating mechanism is arranged on the feeding mechanism, and the separating mechanism includes connecting strips that are symmetrically arranged above the connecting platform, and the connecting strips are symmetrically provided with separating rods. The separating mechanism is used to intermittently separate and load the workpieces on the feeding mechanism.

[0006] Preferably, the grinding assembly includes a circular chain rotatably arranged on the grinding table, a plurality of connecting seats are fixed and equidistantly arranged on the circular chain, a sleeve rod is fixedly arranged on the connecting seat, a fixed seat is fixedly arranged on the connecting table, a drive motor is fixedly connected to the fixed seat, and the drive shaft of the drive motor is connected to the grinding wheel.

[0007] Preferably, the feeding mechanism also includes a rotating shaft rotatably arranged at the top of the connecting platform, a centrifugal disc is fixedly arranged on the outer surface of the rotating shaft, a fence is fixedly arranged at the top of the connecting platform, a pad is fixedly arranged at the opening of the fence, a fixed plate is fixedly arranged on the top of the fence, a fixed rod is fixedly arranged on the bottom of the fixed plate, and an arc-shaped piece is fixedly connected to the fixed rod.

[0008] Preferably, the feeding mechanism also includes a vertical plate symmetrically fixed on the top of the connecting platform, and grooves are provided on the opposite sides of the vertical plate. A conveyor belt with opposite rotation directions is provided in the groove, and one end opening of the vertical plate is connected to the enclosure, and the other end opening of the vertical plate is connected to the feeding trough.

[0009] Preferably, the partition mechanism further comprises a connecting frame fixedly arranged above the connecting platform, the connecting frame is located above the vertical plate, a linear cylinder is fixedly arranged on the connecting frame, and an output shaft is movably arranged on the linear cylinder.

[0010] Preferably, a movable groove is formed through the connecting frame, a movable block is slidably provided in the movable groove, and an outer surface of the movable block is fixedly connected to the output shaft of the linear cylinder.

[0011] Preferably, a movable plate is fixedly connected to the bottom of the movable block, the top of the movable plate is attached to the bottom of the connecting frame, and a protrusion is fixedly provided in the middle of the movable block, and the protrusion is arranged in three sections.

[0012] Preferably, a plurality of connecting rods are symmetrically fixedly arranged on the connecting frame, a connecting plate is fixedly connected to the bottom of the connecting rods, a movable rod is movably arranged through the connecting plate, and the movable rods are symmetrically arranged.

[0013] Preferably, a limiting block is fixedly provided on the top of the moving rod, and a spring is sleeved on the outer surface of the moving rod, and the spring is located between the limiting block and the connecting plate.

[0014] Preferably, a roller is rotatably provided on the top of the limit block, the outer surface of the roller is fitted on the convex block, and the bottom of the moving rod is fixedly connected to the connecting bar.

[0015] The beneficial effects of this application are: The present application provides a device for grinding the spherical surface of an aluminum alloy end, which drives the centrifugal disk to rotate synchronously when the rotating shaft rotates, so that the material above the centrifugal disk is centrifuged, and then it is prompted to gradually approach the arc-shaped sheet. Under the restriction of the arc-shaped sheet and the enclosure, the workpiece gradually approaches the conveyor belt and is transported in an orderly manner to the feed trough by the conveyor belt. The workpiece at the feed trough falls along the feed trough onto the sleeve rod that passes through the middle of the trough, so that the workpiece can be accurately placed and enter the state to be ground.

[0016] The present application provides a spherical surface grinding device for an aluminum alloy end, which starts a linear cylinder, prompting the output shaft of the linear cylinder to pull the movable block to slide in the movable groove, thereby causing the movable plate at the bottom of the movable block to drive the protrusion to move synchronously. While the protrusion moves, its bottom surface will be in a state of squeezing the roller, prompting the movable rod at the bottom of the roller to slide up and down in an offset manner. When the movable rod slides, the connecting strip at its bottom drives the separating rod to separate the workpieces one by one, thereby controlling the loading rhythm of the workpieces. By symmetrically displaced connecting strips arranged above the connecting table and symmetrically arranged separating rods on the connecting strips, intermittent separation and loading of the workpieces can be achieved. The intermittent separation loading is then matched with the operating speed of the circular chain to ensure that the workpieces can be accurately transported to the grinding assembly for grinding, thereby improving the accuracy and consistency of the grinding. This reduces interference and waiting time between workpieces, makes the grinding process smoother, and thus improves overall production efficiency.

[0017] In addition to the above-described purposes, features and advantages, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the enlarged structure at A in the middle; Figure 3 It is a schematic structural diagram of the overall present invention from another perspective; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at B in the middle; Figure 5 It is a schematic diagram of the partial structure of the feeding mechanism of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of a square column of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at C in the middle; Figure 8 It is a schematic diagram of the overall structure of the separation mechanism of the present invention; Figure 9 This is a schematic diagram of the cross-section structure of the separation mechanism of the present invention.

[0019] Description of the figure number: 1. Grinding table; 2. Connecting table; 3. Grinding assembly; 4. Loop chain; 5. Connecting seat; 6. Sleeve rod; 7. Fixed seat; 8. Drive motor; 9. Grinding wheel; 10. Feeding mechanism; 11. Rotating shaft; 12. Centrifugal disc; 13. Enclosure; 14. Pad; 15. Fixed plate; 16. Fixed rod; 17. Arc sheet; 18. Vertical plate; 19. Groove; 20. Conveyor belt; 21. Square column; 22. Through slot; 23. Feeding trough; 24. Separation mechanism; 25. Connecting frame; 26. Linear cylinder; 27. Output shaft; 28. Movable slot; 29. Movable block; 30. Movable plate; 31. Bump; 32. Connecting rod; 33. Connecting plate; 34. Moving rod; 35. Limit block; 36. Spring; 37. Roller; 38. Connecting strip; 39. Separation rod. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to enable those skilled in the art to better understand the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0022] Please refer to Figures 1 to 9 , a device for grinding the spherical surface of an aluminum alloy end, comprising: a grinding table 1, a connecting table 2 fixedly connected to the grinding table 1, a grinding assembly 3 provided on the connecting table 2 and the grinding table 1, the grinding assembly 3 comprising a circular chain 4 rotatably provided on the grinding table 1, the circular chain 4 being the core transmission component of the grinding assembly 3. The circular chain 4 is composed of a plurality of chain links, forming a closed-loop structure, and can operate continuously under the action of a driving device. A plurality of connecting seats 5 are fixedly and equidistantly provided on the circular chain 4, a sleeve rod 6 is fixedly provided on the connecting seat 5, and the sleeve rod 6 is used to install and fix the spherical workpiece of the aluminum alloy end to be ground. A fixed seat 7 is fixedly provided on the connecting table 2, a drive motor 8 is fixedly connected to the fixed seat 7, and a grinding wheel 9 is connected to the drive shaft of the drive motor 8.

[0023] By starting the drive motor 8, the grinding wheel 9 begins to rotate. The drive device of the circular chain 4 is then activated, causing the circular chain 4 to begin operating, driving the aluminum alloy end spherical workpiece on the sleeve rod 6 to move to the grinding area. When the workpiece moves to the grinding area, the rotating grinding wheel 9 contacts the workpiece surface and grinds the workpiece. By adjusting parameters such as the rotational speed, feed rate, and grinding time of the grinding wheel 9, the accuracy and efficiency of the grinding can be controlled. When the workpiece is polished, the circular chain 4 continues to operate, carrying the polished workpiece away from the grinding area and simultaneously bringing a new workpiece to be polished into the grinding area for the next round of grinding.

[0024] Please refer to the Figures 1 to 2 as well as Figures 5 to 7 , a device for grinding the spherical surface of an aluminum alloy end portion, further comprising: a feeding mechanism 10, the feeding mechanism 10 being arranged on a connecting platform 2, the feeding mechanism 10 comprising a square column 21 fixedly arranged above the grinding platform 1, a through groove 22 being penetrated through the square column 21, the square column 21 also being provided with a feeding groove 23, the feeding groove 23 being connected to the through groove 22, the feeding mechanism 10 being used to transport the workpiece to the grinding assembly 3 for grinding operation.

[0025] The feeding mechanism 10 further comprises a rotating shaft 11 rotatably mounted on the top of the connecting platform 2, a centrifugal disc 12 being fixedly mounted on the outer surface of the rotating shaft 11, a fence 13 being fixedly mounted on the top of the connecting platform 2, a pad 14 being fixedly mounted at the opening of the fence 13, a fixing plate 15 being fixedly mounted on the top of the fence 13, a fixing rod 16 being fixedly mounted on the bottom of the fixing plate 15, and an arc-shaped piece 17 being fixedly mounted on the fixing rod 16. The feeding mechanism 10 further comprises a vertical plate 18 symmetrically fixedly mounted on the top of the connecting platform 2, a groove 19 being formed on the opposite surface of the vertical plate 18, a conveyor belt 20 rotating in the opposite direction being mounted in the groove 19, one end opening of the vertical plate 18 being connected to the fence 13, and the other end opening of the vertical plate 18 being connected to the feeding trough 23.

[0026] When the rotating shaft 11 rotates, the centrifugal disc 12 is driven to rotate synchronously, so that the material above the centrifugal disc 12 is centrifuged, and then gradually approaches the arc-shaped piece 17. Under the restriction of the arc-shaped piece 17 and the enclosure 13, the workpiece gradually approaches the conveyor belt 20 and is transported in an orderly manner to the feed trough 23 by the conveyor belt 20. The workpiece at the feed trough 23 falls along the feed trough 23 onto the sleeve rod 6 that passes through the middle of the trough 22, so that the workpiece can be accurately placed and enter the state to be polished, which helps to evenly distribute the workpiece, avoid accumulation, ensure that the workpiece moves according to the predetermined path, and avoid deviation or confusion of the workpiece during transportation.

[0027] Please refer to the Figure 1 、 Figures 3 and 4 as well as Figures 8 and 9, a spherical surface grinding device for an aluminum alloy end portion, further comprising: a separating mechanism 24, the separating mechanism 24 being arranged on the feeding mechanism 10, the separating mechanism 24 comprising connecting bars 38 symmetrically arranged above the connecting platform 2, the connecting bars 38 being symmetrically provided with separating rods 39, the separating mechanism 24 being used to intermittently separate and load the workpieces on the feeding mechanism 10.

[0028] The separator mechanism 24 utilizes connecting bars 38, symmetrically positioned above the connecting platform 2, and separator rods 39, symmetrically positioned on the connecting bars 38, to achieve intermittent, separate loading of workpieces. This intermittent, separate loading, coordinated with the operating speed of the circular chain 4, ensures that workpieces are accurately delivered to the polishing assembly 3 for polishing, thereby improving polishing accuracy and consistency. This reduces interference and waiting time between workpieces, facilitating a smoother polishing process and improving overall production efficiency. Accurate workpiece delivery to the polishing assembly 3 avoids workpiece accumulation or poor delivery.

[0029] The partition mechanism 24 further includes a connecting frame 25 fixedly mounted above the connecting platform 2. The connecting frame 25 is located above the vertical plate 18. A linear cylinder 26 is fixedly mounted on the connecting frame 25, and an output shaft 27 is movably mounted on the linear cylinder 26. A movable groove 28 is provided through the connecting frame 25, and a movable block 29 is slidably mounted in the movable groove 28. The outer surface of the movable block 29 is fixedly connected to the output shaft 27 of the linear cylinder 26. A movable plate 30 is fixedly mounted at the bottom of the movable block 29, and the top of the movable plate 30 is attached to the bottom of the connecting frame 25. A protrusion 31 is fixedly mounted in the middle of the movable block 29, and the protrusion 31 is arranged in a three-stage undulating manner. A number of connecting rods 32 are symmetrically fixedly mounted on the connecting frame 25. The bottoms of the connecting rods 32 are commonly fixedly mounted to a connecting plate 33. Moving rods 34 are movably mounted through the connecting plate 33, and the moving rods 34 are symmetrically arranged. A limit block 35 is fixedly mounted on the top of the moving rod 34. A spring 36 is sleeved on the outer surface of the moving rod 34 and is located between the limit block 35 and the connecting plate 33. A roller 37 is rotatably mounted on the top of the limit block 35. The outer surface of the roller 37 fits against the protrusion 31. The bottom of the moving rod 34 is fixedly connected to the connecting bar 38.

[0030] By activating the linear cylinder 26, the output shaft 27 of the linear cylinder 26 pulls the movable block 29 to slide within the movable groove 28, thereby causing the movable plate 30 at the bottom of the movable block 29 to drive the protrusion 31 to move synchronously. As the protrusion 31 moves, its bottom surface squeezes the roller 37, causing the movable rod 34 at the bottom of the roller 37 to slide up and down. As the movable rod 34 slides, the connecting bar 38 at its bottom drives the separator rod 39 to separate the workpieces one by one, controlling the loading rhythm of the workpieces, avoiding equipment failure or downtime caused by workpiece accumulation or poor conveying, and enhancing the stability and reliability of the equipment. Each workpiece can be quickly and accurately conveyed to the grinding assembly 3, reducing production stagnation and waste, thereby improving overall production efficiency.

[0031] Through all the above embodiments, the working principle of the present invention is: By starting the drive motor 8, the grinding wheel 9 begins to rotate. The drive device of the circular chain 4 is then activated, causing the circular chain 4 to begin operating, driving the aluminum alloy end spherical workpiece on the sleeve rod 6 to move to the grinding area. When the workpiece moves to the grinding area, the rotating grinding wheel 9 contacts the workpiece surface and grinds the workpiece. By adjusting parameters such as the rotational speed, feed rate, and grinding time of the grinding wheel 9, the accuracy and efficiency of the grinding can be controlled. When the workpiece is polished, the circular chain 4 continues to operate, carrying the polished workpiece away from the grinding area and simultaneously bringing a new workpiece to be polished into the grinding area for the next round of grinding. When the rotating shaft 11 rotates, the centrifugal disc 12 is driven to rotate synchronously, causing the material above the centrifugal disc 12 to be centrifuged, thereby causing it to gradually approach the arc-shaped piece 17. Under the restrictive effect of the arc-shaped piece 17 and the enclosure 13, the workpiece gradually approaches the conveyor belt 20 and is transported in an orderly manner to the feed trough 23 by the conveyor belt 20. The workpiece at the feed trough 23 falls along the feed trough 23 onto the sleeve rod 6 in the middle of the through-groove 22, so that the workpiece can be accurately placed and enter the state to be polished. Through the cooperation of the centrifugal disc 12 and the conveyor belt 20, the workpiece can be transported to the feed trough 23 in an orderly and accurate manner, avoiding confusion and accumulation of the workpiece during the transportation process. The setting of the feed trough 23, the through-groove 22 and the conveyor belt 20 ensures that the workpiece can be accurately placed on the sleeve rod 6. When the feeding mechanism 10 is feeding, the linear cylinder 26 is activated, causing the output shaft 27 of the linear cylinder 26 to pull the movable block 29 to slide within the movable groove 28, thereby causing the movable plate 30 at the bottom of the movable block 29 to drive the protrusion 31 to move synchronously. As the protrusion 31 moves, its bottom surface will appear to squeeze the roller 37. Under the force of the spring 36, the movable rod 34 at the bottom of the roller 37 will slide up and down. As the movable rod 34 slides, the connecting bar 38 at its bottom drives the separation rod 39 to separate the workpieces one by one, controlling the feeding rhythm of the workpieces, avoiding equipment failure or downtime caused by workpiece accumulation or poor conveying, and enhancing the stability and reliability of the equipment. Each workpiece can be quickly and accurately conveyed to the grinding assembly 3, reducing stagnation and waste in production, thereby improving overall production efficiency.

[0032] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative, and within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0033] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for polishing the spherical surface of an aluminum alloy end, comprising: A grinding table (1), wherein a connecting table (2) is fixedly connected to the grinding table (1), and a grinding assembly (3) is provided on the connecting table (2) and the grinding table (1), and is characterized in that it further comprises: A feeding mechanism (10), wherein the feeding mechanism (10) is arranged on the connecting platform (2), and the feeding mechanism (10) comprises a square column (21) fixedly arranged above the grinding platform (1), wherein a through groove (22) is formed through the square column (21), and the square column (21) is further provided with a feeding groove (23), wherein the feeding groove (23) and the through groove (22) are communicated with each other, and the feeding mechanism (10) is used to feed the workpiece to the grinding assembly (3) for grinding; A separation mechanism (24) is provided on the feeding mechanism (10), the separation mechanism (24) comprises connecting bars (38) symmetrically arranged above the connecting platform (2), and the connecting bars (38) are symmetrically provided with separation rods (39), and the separation mechanism (24) is used for intermittently separating and loading workpieces on the feeding mechanism (10).

2. The device for polishing the spherical surface of an aluminum alloy end portion according to claim 1, characterized in that: The grinding assembly (3) comprises a circular chain (4) rotatably arranged on the grinding table (1), a plurality of connecting seats (5) fixedly arranged at equal intervals on the circular chain (4), a sleeve rod (6) fixedly arranged on the connecting seat (5), a fixed seat (7) fixedly arranged on the connecting table (2), a driving motor (8) fixedly connected to the fixed seat (7), and a driving shaft of the driving motor (8) connected to a grinding wheel (9).

3. The aluminum alloy end spherical surface grinding device according to claim 1, characterized in that: The feeding mechanism (10) further comprises a rotating shaft (11) rotatably arranged at the top of the connecting platform (2), a centrifugal disc (12) being fixedly arranged on the outer surface of the rotating shaft (11), a fence (13) being fixedly arranged at the top of the connecting platform (2), a pad (14) being fixedly arranged at the opening of the fence (13), a fixing plate (15) being fixedly arranged at the top of the fence (13), a fixing rod (16) being fixedly arranged at the bottom of the fixing plate (15), and an arc-shaped piece (17) being fixedly connected to the fixing rod (16).

4. The aluminum alloy end spherical surface grinding device according to claim 3, characterized in that: The feeding mechanism (10) further comprises a vertical plate (18) symmetrically fixedly arranged on the top of the connecting platform (2), and grooves (19) are provided on opposite sides of the vertical plate (18), and a conveyor belt (20) with opposite rotation directions is provided in the groove (19), and an opening at one end of the vertical plate (18) is connected to the enclosure (13), and an opening at the other end of the vertical plate (18) is connected to the feeding trough (23).

5. The aluminum alloy end spherical surface grinding device according to claim 1, characterized in that: The separation mechanism (24) further comprises a connecting frame (25) fixedly arranged above the connecting platform (2), the connecting frame (25) being located above the vertical plate (18), a linear cylinder (26) being fixedly arranged on the connecting frame (25), and an output shaft (27) being movably arranged on the linear cylinder (26).

6. The device for polishing the spherical surface of an aluminum alloy end portion according to claim 5, characterized in that: A movable groove (28) is formed through the connecting frame (25), a movable block (29) is slidably provided in the movable groove (28), and an outer surface of the movable block (29) is fixedly connected to the output shaft (27) of the linear cylinder (26).

7. The aluminum alloy end spherical surface grinding device according to claim 6, characterized in that: The bottom of the movable block (29) is fixedly connected to a movable plate (30), the top of the movable plate (30) is attached to the bottom of the connecting frame (25), and a protrusion (31) is fixedly provided in the middle of the movable block (29), and the protrusion (31) is arranged in three sections.

8. The device for polishing the spherical surface of an aluminum alloy end portion according to claim 7, characterized in that: A plurality of connecting rods (32) are symmetrically fixedly arranged on the connecting frame (25), a connecting plate (33) is fixedly connected to the bottom of the connecting rods (32), and a movable rod (34) is movably arranged through the connecting plate (33), and the movable rods (34) are symmetrically arranged.

9. The aluminum alloy end spherical surface grinding device according to claim 8, characterized in that: A limit block (35) is fixedly provided on the top of the moving rod (34), and a spring (36) is sleeved on the outer surface of the moving rod (34). The spring (36) is located between the limit block (35) and the connecting plate (33).

10. The aluminum alloy end spherical surface grinding device according to claim 9, characterized in that: A roller (37) is rotatably provided on the top of the limit block (35), and the outer surface of the roller (37) is fitted on the protrusion (31). The bottom of the moving rod (34) is fixedly connected to the connecting bar (38).

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