Metal goods shelf capable of fixing goods conveniently

Abstract

The utility model discloses a metal goods shelf convenient to fix goods, which relates to the technical field of goods display and comprises a vertical table, corner tables are fixedly connected to the positions, close to the bottom, of the front side and the rear side of the vertical table, the vertical table is in a U shape, and four first sliding grooves which are symmetrical front and back are formed in the left side and the right side of the inner side of the vertical table. Lifting mechanisms are rotationally connected to the inner sides of the left wall and the right wall of the vertical table, cranks are fixedly connected to the positions, close to the bottoms, of the right front sides of the lifting mechanisms, a plurality of longitudinally-distributed fixing mechanisms are fixedly connected to the sides, close to each other, of the lifting mechanisms, and each lifting mechanism comprises a lead screw. According to the metal goods shelf convenient for fixing the goods, the crank is rotated to enable the screw rod to rotate, so that the placing plates move up and down, the placing plate at a high position moves to a lower position, a user can conveniently take and place the goods at the position, and the metal goods shelf is simple, convenient and rapid to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of goods display, in particular to a metal shelf which is convenient for fixing goods. Background Art

[0002] Shelves are an important tool for modern warehouses to improve efficiency. With the rapid economic development, foreign-funded enterprises have poured into the Yangtze River Delta and Pearl River Delta areas of my country, which not only promoted the development of the local economy, but also brought new management concepts and management technologies. The types of shelves used in corporate warehouses are becoming more and more automated and intelligent.

[0003] For example, the Chinese patent publication number CN213345094U discloses a metal shelf that is convenient for fixing goods, including a shelf bracket and an anti-dumping base, a protective cap is arranged above the shelf bracket, and a cargo fixing rope is arranged inside the protective cap, a second support plate is arranged below the first support plate, and a rotating baffle is arranged on the front end face of the second support plate, a fixed rotating shaft is arranged on the left side of the front end face of the rotating baffle, an extension rod is arranged on the right side of the rotating baffle, and a fixing pin is arranged behind the extension rod, a third support plate is arranged below the second support plate, and a fixing hole is opened on the front end face of the third support plate, a sliding baffle plate is arranged below the third support plate, and a fourth support plate is arranged below the sliding baffle plate, and the anti-dumping base is arranged below the shelf bracket. This metal shelf that is convenient for fixing goods is convenient for fixing objects of different volumes and has anti-dumping properties.

[0004] The existing technology has the following problems:

[0005] The first support plate in the metal shelf is at the highest position. When a user places or takes goods, it is difficult for the user to touch the support plate at this position, making it difficult for the user to place or take goods there, and an external device for climbing is needed for assistance. Utility Model Content

[0006] The utility model provides a metal shelf which is convenient for fixing goods, so as to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A metal shelf for fixing goods, comprising a stand, wherein corner stands are fixedly connected to the front and rear sides of the stand near the bottom, the stand is U-shaped, and four first sliding grooves symmetrically arranged on the left and right sides of the inner side of the stand are provided, a lifting mechanism is rotatably connected to the inner sides of the left and right walls of the stand, a crank is fixedly connected to the right front side of the lifting mechanism near the bottom, and a plurality of longitudinally distributed fixing mechanisms are fixedly connected to the sides of the lifting mechanisms close to each other.

[0009] Preferably, the lifting mechanism includes a screw rod, the upper and lower ends of which are rotatably connected to the upper and lower surfaces of the inner cavity of the left and right walls of the stand, and four screw rods are rectangularly distributed in the inner cavity of the left and right walls of the stand, the lower ends of the two screw rods located on the front side are fixedly connected to the first bevel gear, the right side surface of the inner cavity of the right wall of the stand is rotatably connected to the second bevel gear near the front lower side, the upper side of the second bevel gear is meshed and connected with the right side of the first bevel gear on the right side, the left side of the crank is fixedly connected to the right side axis of the second bevel gear, the outer wall of the screw rod is threadedly connected with two movable seats symmetrically distributed on the left and right sides, the inner sides of the fixing mechanisms on the left and right sides are slidably connected with a plurality of fixed seats symmetrically distributed on the left and right sides, the ends of the two fixed seats located on the uppermost sides that are away from each other are fixedly connected to the first side of the movable seats that are close to each other, the inner side of the lower wall of the stand is rotatably connected with a transmission rod, the left and right ends of the transmission rod are fixedly connected to the third bevel gear, the upper side of the third bevel gear is meshed and connected with the side of the first bevel gear that is close to each other, and the sides of the plurality of fixed seats away from the screw rod are fixedly connected with a mounting platform.

[0010] Preferably, the outer walls of the four screw rods are fixedly connected with sprockets near the lower ends, and the side surfaces of the front and rear two sprockets on the same side are meshedly connected with chains, and two chains are symmetrically distributed on the left and right.

[0011] Preferably, a connecting rod assembly is slidably connected to the left and right sides of two upper and lower adjacent fixed seats, and the connecting rod assembly includes a first connecting rod, and the first connecting rod is rotatably connected to the middle of a side away from the fixed seat, and four second sliding grooves distributed in a rectangular manner are slidably connected to the left and right sides of the fixed seat, and the two ends of the first connecting rod and the second connecting rod are slidably connected to the inner side of the second sliding groove on the side close to each other of the two upper and lower adjacent fixed seats, and two first connecting rods and two second connecting rods are symmetrically distributed on the left and right sides of the fixed seat.

[0012] Preferably, a cross bar is rotatably connected to the middle of the side where the two left and right first connecting rods are close to each other.

[0013] Preferably, the fixing mechanism includes a placing plate, and four circular holes in a rectangular distribution are opened on the upper side of the placing plate near the four corners, and the inner sides of the four circular holes are movably sleeved with fixing components, and the lower side of the fixing components is fixedly connected to the upper sides of two mounting platforms located on the same horizontal plane, and a plurality of support rods are fixedly connected to the sides of the left and right mounting platforms on the same horizontal plane that are close to each other, and the lower side of the placing plate is overlapped on the outer wall of the support rod.

[0014] Preferably, the fixing assembly includes a fixing sleeve, the lower end of the fixing sleeve is fixedly connected to the upper side of the mounting table, the outer wall of the fixing sleeve is movably sleeved on the inner side of the circular hole, the inner wall of the fixing sleeve is movably sleeved with a circular plate, the outer wall of the circular plate is fixedly connected with a movable sleeve through a connecting block, the inner side of the movable sleeve is movably sleeved with a rotating sleeve, the inner side of the fixed sleeve is movably sleeved with a spring, and the spring is located on the upper side of the circular plate, connecting grooves are provided on the front and rear sides of the inner sides of the four circular holes, limiting grooves are provided on the left and right sides of the four circular holes near the upper side, and the protrusions on the left and right sides of the rotating sleeve are movably sleeved on the inner side of the limiting grooves.

[0015] Preferably, the outer wall of the rotating sleeve is provided with friction patterns.

[0016] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0017] The utility model provides a metal shelf which is convenient for fixing goods. The utility model adopts the cooperation of a crank handle, a first slide groove, a lifting mechanism, a screw rod, a sprocket, a chain, a first bevel gear, a second bevel gear, a transmission rod, a third bevel gear, a movable seat, a connecting rod assembly, a first connecting rod, a second connecting rod, a second slide groove, a fixed seat, a mounting table and a placement plate. By turning the crank handle, the screw rod rotates, and then the placement plate moves up and down, so that the placement plate at a high place moves to a lower position, which is convenient for users to take and place goods at the place. The operation is simple, convenient and quick.

[0018] The utility model provides a metal shelf which is convenient for fixing goods. The utility model adopts the cooperation of a fixing mechanism, a placing plate, a fixing assembly, a fixing sleeve, a circular plate, a movable sleeve, a rotating sleeve, a spring, a circular hole, a connecting groove, a limiting groove and a supporting rod. By rotating the rotating sleeve, a convex block on the rotating sleeve is aligned with the connecting groove, so that the placing plate is disassembled, which is convenient for users to maintain the shelf, such as cleaning dust, etc., and the disassembly is convenient and the installation is quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 It is a partial cross-sectional three-dimensional structural schematic diagram of the utility model;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the lifting mechanism of the utility model;

[0022] Figure 4 This is an enlarged structural diagram of part A of the utility model;

[0023] Figure 5 It is a partial cross-sectional three-dimensional structural schematic diagram of the fixing mechanism of the utility model;

[0024] Figure 6 It is a schematic diagram of the enlarged structure of part B of the utility model.

[0025] In the figure: 1. stand; 2. angle platform; 3. crank; 4. first slide; 5. lifting mechanism; 51. screw; 52. sprocket; 53. chain; 54. first bevel gear; 55. second bevel gear; 56. transmission rod; 57. third bevel gear; 58. moving seat; 59. connecting rod assembly; 591. first connecting rod; 592. second connecting rod; 593. second slide; 510. fixed seat; 511. mounting table; 6. fixing mechanism; 61. placing plate; 62. fixing assembly; 621. fixing sleeve; 622. round plate; 623. moving sleeve; 624. rotating sleeve; 625. spring; 63. round hole; 64. connecting groove; 65. limiting groove; 66. supporting rod. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0027] like Figure 1 , Figure 2 As shown, a metal shelf for fixing goods includes a stand 1, and corner stands 2 are fixedly connected to the front and rear sides of the stand 1 near the bottom. The stand 1 is U-shaped, and four first slide grooves 4 are symmetrical on the left and right sides of the inner side of the stand 1. A lifting mechanism 5 is rotatably connected to the inner sides of the left and right walls of the stand 1, and a crank 3 is fixedly connected to the right front side of the lifting mechanism 5 near the bottom, and a plurality of longitudinally distributed fixing mechanisms 6 are fixedly connected to the side of the lifting mechanism 5 close to each other.

[0028] It should be noted that the corner platform 2 is used to increase the contact area between the stand 1 and the ground to prevent the stand 1 from tipping over.

[0029] like Figure 3-Figure 5As shown, the lifting mechanism 5 includes a screw rod 51, the upper and lower ends of which are rotatably connected to the upper and lower surfaces of the inner cavity of the left and right walls of the stand 1, and four screw rods 51 are rectangularly distributed in the inner cavity of the left and right walls of the stand 1, the lower ends of the two screw rods 51 located on the front side are fixedly connected to the first bevel gear 54, and the right side surface of the inner cavity of the right wall of the stand 1 is rotatably connected to the second bevel gear 55 near the front lower side, the upper side of the second bevel gear 55 is meshed and connected with the right side of the first bevel gear 54 on the right side, the left side of the crank 3 is fixedly connected to the right side axis of the second bevel gear 55, and the outer wall of the screw rod 51 is threadedly connected to Two movable seats 58 are symmetrically distributed on the left and right, and the inner sides of the left and right fixing mechanisms 6 are slidably connected with a plurality of fixed seats 510 symmetrically distributed on the left and right. The ends of the two uppermost fixed seats 510 that are away from each other are fixedly connected to the first side of the movable seats 58 that are close to each other. A transmission rod 56 is rotatably connected to the inner side of the lower wall of the stand 1. The left and right ends of the transmission rod 56 are fixedly connected with the third bevel gear 57. The upper side of the third bevel gear 57 is meshed and connected with the side of the first bevel gear 54 that is close to each other. The sides of the plurality of fixed seats 510 that are away from the screw rod 51 are fixedly connected with the mounting platform 511.

[0030] It should be noted that, when the crank 3 is rotated, the second bevel gear 55 is rotated, and when the second bevel gear 55 is rotated, it drives the first bevel gear 54 on the right and the third bevel gear 57 on the right to rotate, and when the first bevel gear 54 on the right is rotated, it drives the screw rod 51 on the right front side to rotate, and the rotation of the third bevel gear 57 on the right side relies on the transmission rod 56 to make the third bevel gears 57 on both sides rotate synchronously, thereby making the screw rods 51 on the left and right sides rotate synchronously, causing the moving seats 58 on both sides to move up and down synchronously.

[0031] like Figure 3-Figure 5 As shown, the outer walls of the four screw rods 51 are fixedly connected to sprockets 52 near the lower ends, and the sides of the front and rear sprockets 52 on the same side are meshedly connected to chains 53, and two chains 53 are symmetrically distributed on the left and right.

[0032] It should be noted that when the screw rod 51 at the front side rotates, it drives the sprocket 52 at the front side to rotate. By relying on the chain 53, the four screw rods 51 rotate synchronously, thereby making the front and rear sides of the moving seat 58 balanced in force.

[0033] like Figure 5As shown, the left and right sides of the two adjacent upper and lower fixed seats 510 are slidably connected with a connecting rod assembly 59, and the connecting rod assembly 59 includes a first connecting rod 591, and the first connecting rod 591 is rotatably connected with a second connecting rod 592 in the middle of a side away from the fixed seat 510, and the left and right sides of the fixed seat 510 are slidably connected with four second sliding grooves 593 distributed in a rectangular manner, and both ends of the first connecting rod 591 and the second connecting rod 592 are slidably connected to the inner side of the second sliding groove 593 on the side where the two adjacent upper and lower fixed seats 510 are close to each other, and two first connecting rods 591 and two second connecting rods 592 are symmetrically distributed on the left and right sides of the fixed seat 510.

[0034] It should be noted that when the fixed seat 510 located on the upper side moves upward, the fixed seat 510 located on the upper side drives the upper ends of the first connecting rod 591 and the second connecting rod 592 to move upward, and the upper ends of the first connecting rod 591 and the second connecting rod 592 slide on the inner side of the second sliding groove 593. When the upper end of the first connecting rod 591 and the upper end of the second connecting rod 592 move to one end of the second sliding groove 593 close to the middle of the fixed seat 510, the first connecting rod 591 and the second connecting rod 592 pull the fixed seat 510 located on the lower side to move upward.

[0035] like Figure 5 As shown, a cross bar is rotatably connected to the middle of the side where the two left and right first connecting rods 591 are close to each other.

[0036] It should be noted that the cross bar is used to strengthen the strength between the first connecting rods 591 on both sides, so that the first connecting rod 591 and the second connecting rod 592 can withstand greater tension.

[0037] like Figure 5 , Figure 6 As shown, the fixing mechanism 6 includes a placing plate 61, and four circular holes 63 with rectangular distribution are opened on the upper side of the placing plate 61 near the four corners, and the inner sides of the four circular holes 63 are movably sleeved with fixing components 62, and the lower side of the fixing components 62 is fixedly connected to the upper sides of two mounting platforms 511 located on the same horizontal plane, and a plurality of support rods 66 are fixedly connected to the sides of the left and right mounting platforms 511 on the same horizontal plane that are close to each other, and the lower side of the placing plate 61 is overlapped on the outer wall of the support rods 66.

[0038] It should be noted that the placement plate 61 is used to place goods, the support rod 66 is used to support the placement plate 61, and the upper surface of the placement plate 61 is sunken toward the middle to prevent the goods from sliding off the placement plate 61.

[0039] like Figure 6As shown, the fixing assembly 62 includes a fixing sleeve 621, the lower end of which is fixedly connected to the upper side of the mounting platform 511, the outer wall of the fixing sleeve 621 is movably sleeved on the inner side of the circular hole 63, the inner wall of the fixing sleeve 621 is movably sleeved with a circular plate 622, the outer wall of the circular plate 622 is fixedly connected with a movable sleeve 623 through a connecting block, the inner side of the movable sleeve 623 is movably sleeved with a rotating sleeve 624, the inner side of the fixing sleeve 621 is movably sleeved with a spring 625, and the spring 625 is located on the upper side of the circular plate 622, connecting grooves 64 are provided on the front and rear sides of the inner sides of the four circular holes 63, limiting grooves 65 are provided on the left and right sides of the four circular holes 63 near the upper side, and the protrusions on the left and right sides of the rotating sleeve 624 are movably sleeved on the inner side of the limiting grooves 65.

[0040] It should be noted that when the protrusions on the outside of the rotating sleeve 624 are aligned with the connecting groove 64, the placement plate 61 can be movably sleeved on the outside of the rotating sleeve 624. When the protrusions on both sides of the rotating sleeve 624 are located on the inside of the limiting groove 65, the rotating sleeve 624 cannot rotate. The spring 625 pushes the circular plate 622 downward, so that the placement plate 61 is fixed. The rotating sleeve 624 is pulled upward, so that the rotating sleeve 624 can be separated from the limiting groove 65.

[0041] like Figure 6 As shown, the outer wall of the rotating sleeve 624 is provided with friction patterns.

[0042] It should be noted that the friction pattern is used to increase the friction force of the hand on the rotating sleeve 624 , making it easier for the user to pull the rotating sleeve 624 .

[0043] The working principle of the utility model is as follows: first, the crank 3 is rotated to rotate the second bevel gear 55. When the second bevel gear 55 rotates, it drives the first bevel gear 54 on the right and the third bevel gear 57 on the right to rotate. When the first bevel gear 54 on the right rotates, it drives the screw rod 51 on the right front side to rotate. The third bevel gear 57 on the right rotates by the transmission rod 56, so that the third bevel gears 57 on both sides rotate synchronously, thereby making the screw rods 51 on the left and right sides rotate synchronously, causing the moving seats 58 on both sides to move up and down synchronously. When the screw rod 51 at the front side rotates, it drives the sprocket 52 at the front side to rotate. Relying on the chain 53, the four screw rods 51 rotate synchronously, so that the front and rear sides of the movable seat 58 are subjected to balanced forces. When the fixed seat 510 at the upper side moves upward, the fixed seat 510 at the upper side drives the upper ends of the first connecting rod 591 and the second connecting rod 592 to move upward. The upper ends of the first connecting rod 591 and the second connecting rod 592 slide on the inner side of the second sliding groove 593. When the upper end of the first connecting rod 591 and the upper end of the second connecting rod 592 When the second slide groove 593 moves to one end near the middle of the fixed seat 510, the first connecting rod 591 and the second connecting rod 592 pull the fixed seat 510 located at the lower side to move upward, and the screw rod 51 is rotated by turning the crank 3, so that the placement plate 61 moves up and down, causing the placement plate 61 at a high position to move to a lower position, which is convenient for users to take and place goods there. The operation is simple, convenient and fast. Finally, when the protrusion on the outer side of the rotating sleeve 624 is aligned with the connecting groove 64, the placement plate 61 can be movably sleeved on the rotating sleeve 6 24, when the protrusions on both sides of the rotating sleeve 624 are located on the inner side of the limiting groove 65, the rotating sleeve 624 cannot rotate, and the spring 625 presses the circular plate 622 downward, so that the placement plate 61 is fixed, and the rotating sleeve 624 is pulled upward to make the rotating sleeve 624 disengage from the limiting groove 65. By rotating the rotating sleeve 624, the protrusions on the rotating sleeve 624 are aligned with the connecting groove 64, so that the placement plate 61 is removed, which is convenient for users to maintain the shelf, such as cleaning dust, etc., and the removal is convenient and the installation is quick.

[0044] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A metal shelf for fixing goods, comprising a stand (1), characterized in that: The stand (1) is fixedly connected to a corner platform (2) at positions near the bottom on both the front and rear sides. The stand (1) is in a U-shape. Four first sliding grooves (4) are provided on the inner left and right sides of the stand (1) in a front-to-back symmetrical manner. A lifting mechanism (5) is rotatably connected to the inner sides of the left and right walls of the stand (1). A crank (3) is fixedly connected to the right front side of the lifting mechanism (5) at a position near the bottom. A plurality of longitudinally distributed fixing mechanisms (6) are fixedly connected to the sides of the lifting mechanism (5) close to each other.

2. A metal shelf for fixing goods according to claim 1, characterized in that: The lifting mechanism (5) comprises a screw rod (51), the upper and lower ends of which are rotatably connected to the upper and lower surfaces of the inner cavity of the left and right walls of the stand (1), and four screw rods (51) are rectangularly distributed in the inner cavity of the left and right walls of the stand (1), the lower ends of the two screw rods (51) located on the front side are fixedly connected to the first bevel gear (54), the right side surface of the inner cavity of the right wall of the stand (1) is rotatably connected to the second bevel gear (55) at a position close to the front lower side, the upper side of the second bevel gear (55) is meshed and connected with the right side of the first bevel gear (54) on the right side, the left side of the crank (3) is fixedly connected to the right side axis of the second bevel gear (55), and the outer wall of the screw rod (51) is threadedly connected to the right side of the inner cavity of the right wall of the stand (1). There are two movable seats (58) symmetrically distributed on the left and right sides, and the inner sides of the fixing mechanisms (6) on the left and right sides are slidably connected to a plurality of fixed seats (510) symmetrically distributed on the left and right sides, and the ends of the two fixed seats (510) located on the uppermost sides that are away from each other are fixedly connected to the movable seats (58) and close to each other on the first side, and the inner side of the lower wall of the stand (1) is rotatably connected to a transmission rod (56), and the left and right ends of the transmission rod (56) are fixedly connected to a third bevel gear (57), and the upper side of the third bevel gear (57) is meshed and connected with the side of the first bevel gear (54) that is close to each other, and the sides of the plurality of fixed seats (510) that are away from the screw rod (51) are fixedly connected to a mounting table (511).

3. A metal shelf for fixing goods according to claim 2, characterized in that: The outer walls of the four screw rods (51) are fixedly connected to sprockets (52) near the lower ends, and the side surfaces of the two front and rear sprockets (52) on the same side are meshedly connected to chains (53), and two chains (53) are symmetrically distributed on the left and right.

4. A metal shelf for fixing goods according to claim 2, characterized in that: The left and right sides of the two upper and lower adjacent fixed seats (510) are slidably connected with a connecting rod assembly (59), and the connecting rod assembly (59) includes a first connecting rod (591), and the first connecting rod (591) is rotatably connected with a second connecting rod (592) at the middle of a side away from the fixed seat (510), and the left and right sides of the fixed seat (510) are slidably connected with four second sliding grooves (593) distributed in a rectangular shape, and the two ends of the first connecting rod (591) and the second connecting rod (592) are slidably connected to the inner side of the second sliding groove (593) on the side close to each other of the two upper and lower adjacent fixed seats (510), and two first connecting rods (591) and two second connecting rods (592) are symmetrically distributed on the left and right sides of the fixed seat (510).

5. A metal shelf for fixing goods according to claim 4, characterized in that: A crossbar is rotatably connected to the middle of the mutually adjacent sides of the two left and right first connecting rods (591).

6. A metal shelf for fixing goods according to claim 2, characterized in that: The fixing mechanism (6) comprises a placement plate (61), and four circular holes (63) arranged in a rectangular arrangement are provided on the upper side of the placement plate (61) near the four corners. The inner sides of the four circular holes (63) are movably sleeved with fixing components (62), and the lower side of the fixing components (62) is fixedly connected to the upper sides of two mounting platforms (511) located on the same horizontal plane. A plurality of support rods (66) are fixedly connected to the sides of the left and right mounting platforms (511) located on the same horizontal plane that are close to each other, and the lower side of the placement plate (61) is overlapped on the outer wall of the support rods (66).

7. A metal shelf for fixing goods according to claim 6, characterized in that: The fixing assembly (62) comprises a fixing sleeve (621), the lower end of which is fixedly connected to the upper side of the mounting platform (511), the outer wall of which is movably sleeved on the inner side of the circular hole (63), the inner wall of which is movably sleeved with a circular plate (622), the outer wall of which is fixedly connected with a moving sleeve (623) via a connecting block, the inner side of which is movably sleeved with a rotating sleeve (624), the inner side of which is movably sleeved with a spring (625), and the spring (625) is located on the upper side of the circular plate (622), the inner sides of the four circular holes (63) are provided with connecting grooves (64), the left and right sides of the four circular holes (63) are provided with limiting grooves (65) near the upper side, and the protrusions on the left and right sides of the rotating sleeve (624) are movably sleeved on the inner side of the limiting grooves (65).

8. A metal shelf for fixing goods according to claim 7, characterized in that: The outer wall of the rotating sleeve (624) is provided with friction patterns.

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