A welding positioning device for a constant temperature bath

Abstract

The present invention relates to the technical field of welding, and specifically, to a welding positioning device for a constant temperature bath, which comprises a base. A first chassis for positioning the feet of the constant temperature bath is arranged inside the base. A positioning chamber is arranged on the inner side of the base. A positioning assembly for positioning the inner liner and the outer layer of the constant temperature bath is arranged inside the positioning chamber. A rotating rod for positioning the distance between the inner liner and the outer layer is arranged inside the positioning assembly. A clamping plate for fixing the inner liner is arranged inside the positioning assembly. A placement ring for restricting the position of the outer layer of the constant temperature bath is arranged inside the positioning assembly. By starting the positioning assembly, the present invention uses the rotating rod to complete the adjustment of the distance between the inner liner and the outer layer, and at the same time uses the placement ring to complete the restriction of the outer layer.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to a welding positioning device for a constant temperature bath. Background Art

[0002] A thermostatic bath, as the name implies, is a tank that can maintain a certain temperature range. Depending on the thermostatic medium, it can be divided into thermostatic air and thermostatic liquid. The thermostatic liquid bath can be further divided into low-temperature thermostatic baths (generally -40°C to 100°C) and super thermostatic baths (generally room temperature 100°C to 300°C) according to the temperature range. Since liquid media above 100°C cannot be used with water but with oil, thermostatic baths of 100°C to 300°C are usually called oil baths.

[0003] The Chinese announcement number is: CN221582443U, which discloses a high-precision positioning device for thermostatic bath welding, including a frame and a turntable with a pivot mounted thereon, with an outer stopper and an inner stopper fixed on the turntable; the outer stopper and the inner stopper are both provided with a pressing assembly for pressing the extension bar thereon, so that the extension bar arranged on the outer stopper is in close contact with the outer wall of the thermostatic bath and the extension bar arranged on the inner stopper is in close contact with the inner wall of the thermostatic bath; the frame is also provided with a pressing assembly for pressing the extension bar and the thermostatic bath tightly. The beneficial effects of this patent are mainly reflected in: the design is sophisticated, the outer stopper and the inner stopper cooperate with each other to accurately limit the thermostatic bath, the upper surface of the extension bar on the upper surface of the outer stopper and the inner stopper is at a level with the top height of the thermostatic bath, thereby facilitating subsequent welding by a welder and improving work efficiency; in addition, the outer stopper and the inner stopper can support the extension bar;

[0004] Although the above patent uses the outer stopper and the inner stopper to cooperate with each other to accurately limit the constant temperature bath and ensure the support of the extension bar, which is convenient for subsequent welding by the welder, it is considered that in addition to welding the extension bar, the constant temperature bath also needs to ensure the welding of the inner plug and the subsequent welding of each leg, and the position of each leg needs to be determined during the welding process to ensure the stability and accuracy of the welding;

[0005] In view of this, we propose a welding positioning device for a constant temperature bath. Summary of the Invention

[0006] The object of the present invention is to provide a welding positioning device for a constant temperature bath to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides a welding positioning device for a constant temperature bath, including a base. A first chassis for positioning the feet of the constant temperature bath is arranged inside the base. A positioning chamber is arranged on the inner side of the base. A positioning component for positioning the inner liner and the outer layer of the constant temperature bath is arranged inside the positioning chamber. A rotating rod for positioning the distance between the inner liner and the outer layer is arranged inside the positioning component. A clamping plate for fixing the inner liner is arranged inside the positioning component. A placement ring for restricting the position of the outer layer of the constant temperature bath is arranged inside the positioning component, where:

[0008] By starting the positioning component, the distance between the inner liner and the outer layer is adjusted by using the rotating rod, and at the same time, the outer layer is restricted by using the placement ring.

[0009] Preferably, square holes are opened at the tops of both sides of the positioning chamber of the base. The inside of the base is hollow. A plurality of telescopic columns are slidably connected to the bottom inner wall of the base. A foot support is slidably connected to the top of the telescopic column at the end far from the base. A stabilizing member is fixedly connected to the bottom of the telescopic column at the end far from the base.

[0010] Preferably, a first chassis is fixedly connected to the central position of the base. A hydraulic rod is fixedly connected to the top of the first chassis. Sliding blocks are slidably connected to both sides of the first chassis. Springs are fixedly connected to one side of both sliding blocks close to the telescopic column. The springs are fixedly connected to one side of the lower end of the telescopic column at the end far from the sliding blocks.

[0011] Preferably, an inner partition is fixedly connected to the inner side of the positioning chamber. A second chassis is fixedly connected to the bottom inner wall of the positioning chamber. A plurality of slide rails are fixedly connected to the bottom inside of the positioning chamber. The plurality of slide rails are circularly arrayed around the second chassis, where:

[0012] The bottom of the second chassis is fixedly connected to the upper end of the hydraulic rod.

[0013] Preferably, a pressing plate is slidably connected to the outer wall at the lower end of the positioning chamber. The pressing plate is slidably connected to the inner side of the base. A circular hole is opened at the bottom of the pressing plate. The sliding block is located inside the circular hole.

[0014] Preferably, the positioning component includes a motor. The output end of the motor is fixedly connected to a rotating rod. A gear column is fixedly connected to the outer wall of the rotating rod at the end close to the motor. A first thread groove is opened on the outer wall of the middle end of the rotating rod. A second thread groove is opened on the outer wall of the rotating rod at the end far from the motor. The second thread groove and the first thread groove are distributed in the opposite direction.

[0015] Preferably in the present invention, a fixed disk is fixedly connected to the top of the second chassis through a column. A plurality of rings are fixedly connected to the outer wall of the fixed disk. The rings are threadedly connected to the first thread groove and the second thread groove on the rotating rod. A placement table is fixedly connected to the top of the fixed disk.

[0016] Preferably in the present invention, a plurality of fixed columns are fixedly connected to the top of the second chassis. A sliding column is slidably connected to the outer wall of the fixed column. A rack is fixedly connected to one side of the sliding column. The rack is meshed with a gear column. The tops of a plurality of the sliding columns are fixedly connected with a placement ring. The sliding columns and the fixed columns are circularly arrayed around the second chassis. The sliding columns and the fixed columns are located inside the inner partition.

[0017] Preferably in the present invention, a plurality of sliding plates are slidably connected to the top of the slide rail. The motor is fixedly connected to the outer wall of the sliding plate. The rotating rod is rotatably connected to the inside of the sliding plate. A first telescopic rod is fixedly connected to the inside of the sliding plate. The first telescopic rod is fixedly connected to a clamping plate at the end far from the sliding plate. The clamping plate penetrates the inner partition. A second telescopic rod is fixedly connected between the two sliding plates.

[0018] Preferably in the present invention, a limiting column is arranged between the two sliding plates. The limiting column is fan-shaped. A plurality of the limiting columns are fixedly connected to the peripheral position of the bottom inner wall of the positioning chamber. A strip-shaped hole is formed in the outer wall of the limiting column. The width of the strip-shaped hole matches the diameter of the second telescopic rod. The second telescopic rod is slidably connected to the inside of the strip-shaped hole.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In the welding positioning device of this constant temperature bath, driven by the motor, the rotating rod rotates. Under the restriction of the second thread groove and the ring, the rotating rod slides deeply towards the inside of the fixed disk, and at the same time drives the sliding plate to slide inwards on the slide rail. Among them, the sliding plate will drive the first telescopic rod and the clamping plate to slide inwards together. At this time, the bottom of the inner tank of the constant temperature bath is fixed by the clamping plate. At this time, because a plurality of clamping plates clamp the inner tank inwards at the same time, the center of the inner tank always corresponds to the center of the second chassis, and the position of the inner tank is positioned first.

[0021] 2. In the welding positioning device of this constant temperature bath, when the hydraulic rod contracts, the positioning chamber and the lower pressing plate move down together. The lower pressing plate squeezes the sliding block inside, causing the sliding block to slide inwards and pulling the two telescopic columns on both sides to slide inwards in the square hole through the spring and the connecting rod. At this time, the stabilizing member regularizes the outer layer of the constant temperature bath inside it, making the outer layer of the constant temperature bath neatly placed on the placement ring and concentric with the inner tank, which regularizes the inner tank and the outer layer of the constant temperature bath.

[0022] 3. In the welding positioning device of the thermostat, when the rotating rod is driven by the motor to rotate, it will drive the gear column to rotate. Blocked by the rack around the sliding column, the sliding column will be driven to slide upward. During the upward sliding of the sliding column, the outer layer of the thermostat on the placing ring will move upward and separate from the outer wall of the inner tank, causing the inner tank and the outer layer of the thermostat to separate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an overall three-dimensional schematic diagram of the welding positioning device of the thermostat of the present invention;

[0024] Figure 2 is a transverse sectional schematic diagram of the welding positioning device of the thermostat of the present invention;

[0025] Figure 3 is a longitudinal sectional schematic diagram of the welding positioning device of the thermostat of the present invention;

[0026] Figure 4 is a schematic diagram of the interior of a quarter section of the welding positioning device of the thermostat of the present invention;

[0027] Figure 5 is an unfolded three-dimensional schematic diagram of the interior of the welding positioning device of the thermostat of the present invention;

[0028] Figure 6 is a three-dimensional schematic diagram of the positioning component of the welding positioning device of the thermostat of the present invention;

[0029] Figure 7 is a schematic diagram of the internal details of the positioning component of the welding positioning device of the thermostat of the present invention;

[0030] Figure 8 is a three-dimensional schematic diagram of the contraction column of the welding positioning device of the thermostat of the present invention;

[0031] The meanings of the various reference numerals in the figure are as follows:

[0032] 1. Base; 11. Square hole; 12. Telescopic column; 121. Support leg; 122. Stabilizer; 13. First chassis; 131. Sliding block; 132. Spring; 14. Hydraulic rod; 2. Positioning chamber; 21. Inner partition; 22. Second chassis; 23. Slide rail; 24. Pressing plate;

[0033] 3. Positioning component; 31. Motor; 32. Rotating rod; 321. Gear column; 322. First thread groove; 323. Second thread groove; 33. Fixed disk; 331. Ring; 332. Placing table; 34. Fixed column; 341. Sliding column; 3411. Placing ring; 342. Rack; 35. Limit column; 351. Strip hole; 36. Slide plate; 361. First telescopic rod; 362. Clamping plate; 363. Second telescopic rod. DETAILED DESCRIPTION OF THE INVENTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] Embodiment 1

[0037] Please refer to Figures 1-8 As shown, this embodiment provides a welding positioning device for a constant temperature bath, including a base 1. A first chassis 13 for positioning the feet of the constant temperature bath is arranged inside the base 1. A positioning chamber 2 is arranged on the inner side of the base 1. A positioning component 3 for positioning the inner tank and the outer layer of the constant temperature bath is arranged inside the positioning chamber 2. A rotating rod 32 for positioning the distance between the inner tank and the outer layer is arranged inside the positioning component 3. A clamping plate 362 for fixing the inner tank is arranged inside the positioning component 3. A placing ring 3411 for restricting the position of the outer layer of the constant temperature bath is arranged inside the positioning component 3. Among them: by starting the positioning component 3, the distance between the inner tank and the outer layer is adjusted by using the rotating rod 32, and at the same time, the outer layer is restricted by using the placing ring 3411.

[0038] As Figures 2-3 shown, the base 1 is provided with square holes 11 at the tops of both sides of the positioning chamber 2. The inside of the base 1 is hollow. A plurality of telescopic columns 12 are slidably connected to the bottom inner wall of the base 1. A foot support 121 is slidably connected to the top of the far end of the telescopic column 12 away from the base 1. A stabilizing member 122 is fixedly connected to the bottom of the far end of the telescopic column 12 away from the base 1. A first chassis 13 is fixedly connected to the central position of the base 1. A hydraulic rod 14 is fixedly connected to the top of the first chassis 13. Sliding blocks 131 are slidably connected to both sides of the first chassis 13. Springs 132 are fixedly connected to the sides of both sliding blocks 131 close to the telescopic columns 12. The springs 132 are fixedly connected to the lower side of the telescopic column 12 at the end away from the sliding blocks 131.

[0039] Among them: The sliding block 131 sliding on the top of the first chassis 13 will slide to the inner side of the first chassis 13. Then, during the working process, when the pressing plate 24 is driven to move downward, it will squeeze the inclined surface on one side of the sliding block 131, causing the surrounding sliding blocks 131 to contract inward. An extendable connecting rod for stretching is arranged inside the spring 132.

[0040] As Figures 4-5 Shown in the figure, an inner partition 21 is fixedly connected to the inner side of the positioning chamber 2. A second chassis 22 is fixedly connected to the bottom inner wall of the positioning chamber 2. A plurality of slide rails 23 are fixedly connected to the inner bottom of the positioning chamber 2. The plurality of slide rails 23 are circularly arrayed around the second chassis 22. Among them: The bottom of the second chassis 22 is fixedly connected to the upper end of the hydraulic rod 14. The lower outer wall of the positioning chamber 2 is slidably connected with a pressing plate 24. The pressing plate 24 is slidably connected to the inner side of the base 1. A circular hole is opened at the bottom of the pressing plate 24. The sliding block 131 is located inside the circular hole.

[0041] Among them: The slide rails 23 are used to limit the sliding plate 36 to always slide on the track of the slide rails 23, and the ends of the slide rails 23 are located on the outer wall of the second chassis 22.

[0042] As Figure 7 Shown in the figure, the positioning assembly 3 includes a motor 31. The output end of the motor 31 is fixedly connected with a rotating rod 32. A gear column 321 is fixedly connected to the outer wall of the rotating rod 32 near the motor 31. A first thread groove 322 is opened on the outer wall of the middle end of the rotating rod 32. A second thread groove 323 is opened on the outer wall of the end of the rotating rod 32 away from the motor 31. The second thread groove 323 and the first thread groove 322 are distributed in the opposite direction. The top of the second chassis 22 is fixedly connected with a fixed plate 33 through a column. A plurality of rings 331 are fixedly connected to the outer wall of the fixed plate 33. The rings 331 are threadedly connected with the first thread groove 322 and the second thread groove 323 on the rotating rod 32. A placing table 332 is fixedly connected to the top of the fixed plate 33. A plurality of fixing columns 34 are fixedly connected to the top of the second chassis 22. The outer wall of the fixing column 34 is slidably connected with a sliding column 341. A rack 342 is fixedly connected to one side of the sliding column 341. The rack 342 is meshed with the gear column 321. The tops of the plurality of sliding columns 341 are fixedly connected with a placing ring 3411. The sliding columns 341 and the fixing columns 34 are both circularly arrayed around the second chassis 22. The sliding columns 341 and the fixing columns 34 are located inside the inner partition 21.

[0043] Among them: Restricted by the rings 331 around the fixed plate 33, the rotating rod 32 rotates under the drive of the motor 31 and slides under the restriction of the rings 331. During the sliding process, it will drive the sliding plate 36 to slide on the slide rails 23. At the same time, when the rotating rod 32 rotates, the gear column 321 will drive the sliding column 341 to slide up and down.

[0044] AsFigure 8 As shown, the top of the slide rail 23 is slidably connected to a plurality of sliding plates 36, the motor 31 is fixedly connected to the outer wall of the sliding plate 36, the rotating rod 32 is rotatably connected to the inner side of the sliding plate 36, and the inner side of the sliding plate 36 is fixedly connected to a No. 1 telescopic rod 361, and the No. 1 telescopic rod 361 is fixedly connected to a splint 362 at the end away from the sliding plate 36, and the splint 362 passes through the inner partition 21, and a No. 2 telescopic rod 363 is fixedly connected between the two sliding plates 36, and a limiting column 35 is arranged between the two sliding plates 36. The limiting column 35 is fan-shaped, and a plurality of limiting columns 35 are fixedly connected to the peripheral positions of the bottom inner wall of the positioning chamber 2, and a strip hole 351 is opened on the outer wall of the limiting column 35, and the width of the strip hole 351 matches the diameter of the No. 2 telescopic rod 363, and the No. 2 telescopic rod 363 is slidably connected to the inner side of the strip hole 351.

[0045] The plurality of sliding plates 36 are combined to form a regular octagon, and the plurality of sliding plates 36 slide around the limiting pillar 35 and gradually approach each other until they slide to the end of the strip hole 351 .

[0046] It can be seen from this that during the welding process of the double-layer thermostatic bath, the inner and outer layers of the thermostatic bath need to be positioned first, such as Figures 5-8 When the locking cam 331 is unlocked, the locking cam 332 is unlocked, and the locking cam 333 is unlocked.

[0047] It should be noted that, as the rotating rod 32 moves deeper into the inner side, the second thread groove 323 will gradually separate from the ring 331, and the first thread groove 322 will slide to the inner side of the ring 331. After the welding is completed, the motor 31 will rotate outward under the restriction of the first thread groove 322 and the ring 331, thereby loosening the inner container.

[0048] Meanwhile, when the staff sets the outer layer of the constant temperature bath outside the inner tank, the hydraulic rod 14 contracts, causing the positioning chamber 2 and the lower pressing plate 24 to move downward together. At this time, the inner wall of the circular hole at the bottom of the lower pressing plate 24 will squeeze the inner sliding block 131. By squeezing the inclined surface of the sliding block 131, the two sliding blocks 131 will slide inward. During the inward sliding process of the sliding block 131, the two telescopic columns 12 will be pulled inward in the square hole 11 through the spring 132 and the connecting rod. At this time, the stabilizing member 122 on the telescopic column 12 will regularize the outer layer of the constant temperature bath inside it, making the outer layer of the constant temperature bath regular on the placing ring 3411 and concentric with the inner tank. This makes the inner tank and the outer layer of the constant temperature bath regular;

[0049] It should be noted that when the outer layer is placed outside the inner tank, the outer layer of the constant temperature bath is in contact with the outer wall of the inner tank. If welding is required, they need to be separated. During the rotation of the rotating rod 32 driven by the motor 31, the gear column 321 will be driven to rotate. Since the gear column 321 is at a constant horizontal plane, during its rotation, it will be blocked by the rack 342 around the sliding column 341, driving the sliding column 341 to slide upward. During the upward sliding process of the sliding column 341, the outer layer of the constant temperature bath on the placing ring 3411 will be driven to move upward and separate from the outer wall of the inner tank, separating the inner tank and the outer layer of the constant temperature bath;

[0050] Similarly, during the inward sliding process of the telescopic column 12, the support leg 121 will also be in contact with the outer wall of the outer layer. At this time, the staff can fix the support leg on the support leg 121 for welding.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding positioning device for a constant temperature bath, comprising a base (1), characterized in that: A first chassis (13) for positioning the feet of the thermostat is provided inside the base (1). A positioning chamber (2) is provided on the inner side of the base (1). A positioning assembly (3) for positioning the inner tank and the outer layer of the thermostat is provided inside the positioning chamber (2). A rotating rod (32) for positioning the distance between the inner tank and the outer layer is provided inside the positioning assembly (3). A clamping plate (362) for fixing the inner tank is provided inside the positioning assembly (3). A placement ring (3411) for restricting the position of the outer layer of the thermostat is provided inside the positioning assembly (3). Wherein: By starting the positioning assembly (3), the distance between the inner tank and the outer layer is adjusted by using the rotating rod (32), and at the same time, the outer layer is restricted by using the placement ring (3411); An inner partition (21) is fixedly connected to the inner side of the positioning chamber (2). A second chassis (22) is fixedly connected to the bottom inner wall of the positioning chamber (2). A plurality of slide rails (23) are fixedly connected to the inner bottom of the positioning chamber (2). The plurality of slide rails (23) are circularly arrayed around the second chassis (22); The positioning assembly (3) includes a motor (31). The output end of the motor (31) is fixedly connected to a rotating rod (32). A gear column (321) is fixedly connected to the outer wall of the rotating rod (32) near the motor (31). A first threaded groove (322) is formed in the outer wall of the middle end of the rotating rod (32). A second threaded groove (323) is formed in the outer wall of the rotating rod (32) far from the motor (31). The second threaded groove (323) is distributed in the opposite direction to the first threaded groove (322); A fixed disk (33) is fixedly connected to the top of the second chassis (22) through a column. A plurality of rings (331) are fixedly connected to the outer wall of the fixed disk (33). The rings (331) are threadedly connected to the first threaded groove (322) and the second threaded groove (323) on the rotating rod (32). A placement table (332) is fixedly connected to the top of the fixed disk (33); A plurality of fixed columns (34) are fixedly connected to the top of the second chassis (22). A sliding column (341) is slidably connected to the outer wall of the fixed column (34). A rack (342) is fixedly connected to one side of the sliding column (341). The rack (342) is meshed with the gear column (321). A placement ring (3411) is fixedly connected to the top of the plurality of sliding columns (341). The sliding columns (341) and the fixed columns (34) are both circularly arrayed around the second chassis (22). The sliding columns (341) and the fixed columns (34) are located inside the inner partition (21); A plurality of sliding plates (36) are slidably connected to the top of the slide rail (23). The motor (31) is fixedly connected to the outer wall of the sliding plate (36). The rotating rod (32) is rotatably connected to the inner side of the sliding plate (36). A first telescopic rod (361) is fixedly connected to the inner side of the sliding plate (36). The first telescopic rod (361) is fixedly connected to a clamping plate (362) at the end away from the sliding plate (36). The clamping plate (362) penetrates through the inner partition plate (21). A second telescopic rod (363) is fixedly connected between the two sliding plates (36).

2. The welding positioning device of a constant temperature bath according to claim 1, characterized in that: Square holes (11) are formed in the top sides of both sides of the positioning chamber (2) of the base (1). The inside of the base (1) is hollow. A plurality of telescopic columns (12) are slidably connected to the bottom inner wall of the base (1). A support leg frame (121) is slidably connected to the top of the end of the telescopic column (12) away from the base (1). A stabilizing member (122) is fixedly connected to the bottom of the end of the telescopic column (12) away from the base (1).

3. The welding positioning device of a constant temperature bath according to claim 2, characterized in that: A first chassis (13) is fixedly connected to the central position of the base (1). A hydraulic rod (14) is fixedly connected to the top of the first chassis (13). Sliding blocks (131) are slidably connected to both sides of the first chassis (13). Springs (132) are fixedly connected to the sides of both sliding blocks (131) close to the telescopic columns (12). The springs (132) are fixedly connected to one side of the lower end of the telescopic column (12) at the end away from the sliding blocks (131).

4. A welding positioning device for a constant temperature bath according to claim 3, characterized in that: The bottom of the second chassis (22) is fixedly connected to the upper end of the hydraulic rod (14).

5. The welding positioning device of a constant temperature bath according to claim 4, characterized in that: A pressing disc (24) is slidably connected to the outer wall of the lower end of the positioning chamber (2). The pressing disc (24) is slidably connected to the inside of the base (1). A circular hole is formed in the bottom of the pressing disc (24). The sliding block (131) is located inside the circular hole.

6. The welding positioning device of a constant temperature bath according to claim 5, characterized in that: A limiting column (35) is arranged between the two sliding plates (36). The limiting column (35) is fan-shaped. A plurality of limiting columns (35) are fixedly connected to the peripheral position of the bottom inner wall of the positioning chamber (2). A strip-shaped hole (351) is formed in the outer wall of the limiting column (35). The width of the strip-shaped hole (351) is adapted to the diameter of the second telescopic rod (363). The second telescopic rod (363) is slidably connected to the inside of the strip-shaped hole (351).

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