Rotatable hydraulic toe-in fork

Abstract

The utility model relates to the technical field of fork truck, disclose a rotatable hydraulic distance adjusting fork, including fixed fork rest and rotating fork rest, the bottom middle of rotating fork rest is rotatably connected in the bottom middle of fixed fork rest through rotating axle assembly, and the top of rotating fork rest both ends is connected with the top of fixed fork rest through rotating oil cylinder respectively, and, two rotating oil cylinders are arranged to series connection form to be able to drive one side elongation when the other side synchronous shortening, be equipped with string axle on rotating fork rest, and the root of left fork and right fork can all be slidably sleeved on string axle, and the tip all extends along the direction perpendicular to rotating fork rest, and the middle section of left fork is connected with the right end of rotating fork rest through right distance adjusting oil cylinder, and the middle section of right fork is connected with the left end of rotating fork rest through left distance adjusting oil cylinder, it can effectively avoid the stress of single fork of fork truck, guarantee the service life of fork, simultaneously, reduced the operation difficulty of slope carrying and carrying oblique goods, and the scope of application is wider.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, specifically to a rotatable hydraulic adjustable fork. Background Technology

[0002] Forklifts are common industrial handling vehicles, mainly used for loading, unloading, stacking, and short-distance transportation of goods. They lift and move goods using their front forks and are widely used in warehouses, ports, factories, logistics centers, and other similar locations.

[0003] When handling goods at an incline, existing forklifts typically experience single-fork stress. Prolonged operation under such conditions severely shortens the lifespan of the forks and structural components, thus increasing forklift usage and maintenance costs. Furthermore, transporting horizontally placed goods on an incline presents significant challenges. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of existing technology, such as the impact of single-fork stress on the service life of forklifts and the difficulty of handling on slopes. This invention provides a rotatable hydraulic adjustable fork that can effectively avoid single-fork stress on the forklift, ensuring the service life of the fork. At the same time, it reduces the difficulty of handling on slopes and handling inclined goods, and has a wider range of applications.

[0005] To achieve the above objectives, this utility model provides a rotatable hydraulic adjustable fork, which includes a fixed fork carriage and a rotating fork carriage. The bottom center of the rotating fork carriage is rotatably connected to the bottom center of the fixed fork carriage via a rotating shaft assembly. The top two ends of the rotating fork carriage are respectively connected to the top of the fixed fork carriage via rotating cylinders. Furthermore, the two rotating cylinders are arranged in series so that when one side extends, the other side shortens simultaneously. The rotating fork carriage is provided with a connecting shaft, and the roots of the left and right forks can be slidably fitted onto the connecting shaft, with their tips extending in a direction perpendicular to the rotating fork carriage. The middle section of the left fork is connected to the right end of the rotating fork carriage via a right adjusting cylinder, and the middle section of the right fork is connected to the left end of the rotating fork carriage via a left adjusting cylinder.

[0006] Preferably, the rotatable hydraulic adjustable fork further includes a shunt baffle, which is detachably mounted on the rotating fork carriage by bolts and configured to limit the shunt.

[0007] Preferably, the bottom of both the left and right adjustable pitch cylinders is connected to the rotating fork carriage via adjustable pitch cylinder mounting pins and adjustable pitch cylinder baffles.

[0008] Preferably, the bottom of the rotary cylinder is connected to the fixed fork carriage via a rotary cylinder mounting pin and a rotary cylinder baffle, and the cylinder head is connected to the rotary fork carriage.

[0009] Preferably, the fixed fork carriage includes an upper cross plate and a lower cross plate, which, together with the vertical plate, form a fixed rectangular frame. A right upright plate and a left upright plate are arranged side-by-side vertically on the back of the fixed rectangular frame. The upper section of the right upright plate is connected to the upper cross plate via a right upright plate stiffener, the middle section via a horizontal stiffener, and the lower section via a horizontal stiffener. The upper end of the left upright plate is connected to the upper cross plate via a left upright plate stiffener, the middle section via a horizontal stiffener, and the lower section via a horizontal stiffener. Both ends of the back of the upper cross plate are provided with partition plates for installing partition plate connectors. The partition plate connectors are connected to the pipelines of the left and right adjusting cylinders. Furthermore, a chain mounting plate is provided near the partition plate for installing the chain.

[0010] Preferably, the lower horizontal plate has a through hole for the rotating shaft assembly to pass through.

[0011] Preferably, both the right column plate stiffener and the left column plate stiffener are provided with a base plate. One side of the base plate is connected to the column plate stiffener through a mounting plate stiffener, and the other side is provided with a rotary cylinder mounting plate for installing the rotary cylinder mounting pin and the rotary cylinder baffle.

[0012] Preferably, the top and bottom of the outer sides of the right column plate and the left column plate are provided with axle heads for mounting the main rollers. The main rollers are configured to roll within the mast of the forklift as the fixed fork carriage moves up and down. Furthermore, mounting holes for mounting side rollers are provided near the axle heads.

[0013] Preferably, the rotating fork carriage includes an upper crossbeam assembly and a lower crossbeam. The upper crossbeam assembly and the lower crossbeam, together with the side plates, form a rotating rectangular frame. The lower crossbeam has through holes and threaded holes. The rotating shaft assembly is configured to pass through the through holes on the lower crossbeam and the lower crossbeam in sequence and be fixed by bolts and threaded holes. A truss plate for installing a truss is provided between the two side plates. A pair of symmetrical rotating cylinder mounting plates for installing rotating cylinders are provided on the top inner side of the two side plates. Adjusting cylinder mounting support assemblies for installing the left adjusting cylinder and the right adjusting cylinder are provided on the middle and bottom inner sides, respectively.

[0014] Preferably, the rotating shaft assembly includes a fixed plate and a rotating shaft. The fixed plate has a central circular hole through which the rotating shaft passes and is welded and fixed. A pair of through holes for bolts to pass through are provided on both sides of the central circular hole.

[0015] The left side of the front end face of the rotating shaft is provided with a pin-pulling hole, which is used to pull the rotating shaft assembly out of the rotating fork carriage after the bolts are removed;

[0016] A lubrication hole is provided on the right side of the front end face of the rotating shaft for adding grease to the rotating mechanism;

[0017] The middle section of the rotating shaft has a stepped surface for storing grease; small round holes connected to lubrication holes are formed on the stepped surface for grease to flow out.

[0018] The two ends of the rotating shaft are chamfered for guiding installation.

[0019] According to the above technical solution, the bottom center of the rotating fork carriage is rotatably connected to the bottom center of the fixed fork carriage via a rotating shaft assembly. The top two ends of the rotating fork carriage are connected to the top of the fixed fork carriage via rotating hydraulic cylinders. The two rotating hydraulic cylinders are arranged in series to drive one side to extend while the other side retracts simultaneously. A connecting shaft is provided on the rotating fork carriage, and the roots of the left and right forks are slidably fitted onto the connecting shaft, with their tips extending perpendicular to the rotating fork carriage. The middle section of the left fork is connected to the right end of the rotating fork carriage via a right adjusting cylinder, and the middle section of the right fork is connected to the left end of the rotating fork carriage via a left adjusting cylinder. In this way, by controlling the extension and retraction of the two rotating hydraulic cylinders to rotate the rotating fork carriage, the height difference between the left and right forks can be changed. This prevents single-fork stress when picking up goods with a height difference between the left and right sides, thus extending the service life of the forks and structural components. Simultaneously, the distance between the left and right forks can be adjusted by extending and retracting the right and left adjusting cylinders, making this rotatable hydraulic adjustable fork more suitable for handling longer cylindrical goods (such as timber and steel pipes) compared to existing forks, thus broadening its application range. Furthermore, in conjunction with the aforementioned rotating fork carriage, the goods can be rotated slightly to keep them parallel to the ground, preventing them from falling and reducing the difficulty of handling goods on slopes and at an angle. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of the rotatable hydraulic adjustable fork provided by this utility model;

[0021] Figure 2 This is a rear view of the rotatable hydraulic adjustable fork provided according to this utility model;

[0022] Figure 3 This is a structural schematic diagram of the fixed fork carriage in the rotatable hydraulic adjustable fork provided by this utility model;

[0023] Figure 4 This is a rear view of the fixed fork carriage in the rotatable hydraulic adjustable fork provided by this utility model;

[0024] Figure 5 This is a structural schematic diagram of the rotating fork carriage in the rotatable hydraulic adjustable fork provided by this utility model;

[0025] Figure 6This is a structural schematic diagram of the rotating shaft assembly in the rotatable hydraulic adjustable fork provided by this utility model;

[0026] Figure 7 yes Figure 6 Enlarged view of the middle fixing plate structure;

[0027] Figure 8 yes Figure 6 Enlarged view of the structure of the central rotation axis;

[0028] Figure 9 This is a diagram showing the usage state of the rotatable hydraulic adjustable fork provided by this utility model.

[0029] Explanation of reference numerals in the attached figures

[0030] 1-Fixed fork carriage 2-Rotating fork carriage

[0031] 3-Twin shaft 4-Left adjusting cylinder

[0032] 5-Right adjustable cylinder; 6-Left fork

[0033] 7-Right fork 8-Adjustable cylinder mounting pin

[0034] 9-Adjustable pitch cylinder baffle 10-Twin shaft baffle

[0035] 11-Rotary cylinder 12-Rotary cylinder mounting pin

[0036] 13-Rotary cylinder baffle 14-Rotary shaft assembly

[0037] 111-Upper horizontal plate 112-Lower horizontal plate

[0038] 113-Right column slab reinforcement 114-Left column slab reinforcement

[0039] 115-Right column panel 116-Left column panel

[0040] 117-Transverse rib plate 118-Chain plate

[0041] 119-Baffle 120-Shaft Head

[0042] 121-Vertical plate 122-Base plate

[0043] 123-Rotary cylinder mounting plate 124-Mounting plate stiffener

[0044] 211-Upper crossbeam assembly 212-Side plate

[0045] 213-Lower crossbeam 214-Shaft plate

[0046] 215-Adjustable cylinder mounting bracket assembly 141-Fixing plate

[0047] 142-Rotating Shaft Detailed Implementation

[0048] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0049] In this utility model, unless otherwise stated, directional words such as "upper," "middle," "lower," "top," "bottom," "center," "left," and "right" contained in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the terminology.

[0050] See Figure 1 This utility model provides a rotatable hydraulic adjustable fork, which includes a fixed fork carriage 1 and a rotating fork carriage 2. The bottom center of the rotating fork carriage 2 is rotatably connected to the bottom center of the fixed fork carriage 1 via a rotating shaft assembly 14. The top two ends of the rotating fork carriage 2 are respectively connected to the top of the fixed fork carriage 1 via rotating cylinders 11. The two rotating cylinders 11 are arranged in series so that when one side extends, the other side shortens synchronously. The rotating fork carriage 2 is provided with a connecting shaft 3. The roots of the left fork 6 and the right fork 7 can be slidably sleeved on the connecting shaft 3, and the tips of both extend in a direction perpendicular to the rotating fork carriage 2. The middle section of the left fork 6 is connected to the right end of the rotating fork carriage 2 via a right adjusting cylinder 5, and the middle section of the right fork 7 is connected to the left end of the rotating fork carriage 2 via a left adjusting cylinder 4.

[0051] Through the above technical solution, the bottom center of the rotating fork carriage 2 is rotatably connected to the bottom center of the fixed fork carriage 1 via a rotating shaft assembly 14. The top two ends of the rotating fork carriage 2 are connected to the top of the fixed fork carriage 1 via rotating cylinders 11, and the two rotating cylinders 11 are arranged in series to drive one side to extend while the other side retracts simultaneously. A connecting shaft 3 is provided on the rotating fork carriage 2, and the roots of the left fork 6 and right fork 7 are slidably fitted onto the connecting shaft 3, with their tips extending perpendicular to the rotating fork carriage 2. The middle section of the left fork 6 is connected to the right end of the rotating fork carriage 2 via a right adjusting cylinder 5, and the middle section of the right fork 7 is connected to the left end of the rotating fork carriage 2 via a left adjusting cylinder 4. In this way, by controlling the extension and retraction of the two rotary cylinders 11 to rotate the rotary fork carriage 2, the height difference between the left fork 6 and the right fork 7 can be changed. This prevents the rotatable hydraulic adjustable fork from bearing force on a single fork when picking up goods with a height difference between the left and right sides, thus extending the service life of the forks and structural components. Simultaneously, the distance between the left fork 6 and the right fork 7 can be adjusted by extending and retracting the right adjustable cylinder 5 and the left adjustable cylinder 4. This makes the rotatable hydraulic adjustable fork more suitable for picking up long cylindrical goods (such as timber, steel pipes, etc.) compared to existing forks. See [link to product description]. Figure 9It has a wider range of applications. In addition, when used with the aforementioned rotating fork carriage 2, the goods can be rotated slightly to keep them parallel to the ground, making them less likely to fall to the ground and reducing the difficulty of handling goods on slopes and at an angle.

[0052] In this embodiment, in order to ensure the stability of the left fork 6 and the right fork 7 when sliding left and right along the tandem shaft 3, preferably, the rotatable hydraulic adjustable fork also includes a tandem shaft baffle 10. The tandem shaft baffle 10 is detachably mounted on the rotating fork carriage 2 by bolts and is configured to limit the movement of the tandem shaft 3.

[0053] In this embodiment, to facilitate quick and easy installation and disassembly of the adjusting cylinder, and to ensure the stability of the adjusting cylinder after installation, thus guaranteeing its efficient adjustment of the angle of the rotating fork carriage 2, as follows: Figure 2 As shown, preferably, the bottom of both the left adjusting cylinder 4 and the right adjusting cylinder 5 are connected to the rotating fork carriage 2 through adjusting cylinder mounting pins 8 and adjusting cylinder baffles 9.

[0054] Similarly, in order to facilitate quick and easy installation and disassembly of the rotary cylinder 11, and to ensure the stability of the rotary cylinder 11 after installation, so that its extension or shortening is smooth and seamless, it is preferable to connect the bottom of the rotary cylinder 11 to the fixed fork carriage 1 through the rotary cylinder mounting pin 12 and the rotary cylinder baffle 13, and connect the cylinder head to the rotary fork carriage 2.

[0055] See Figure 3 and Figure 4 In this embodiment, the fixed fork carriage 1 preferably includes an upper horizontal plate 111 and a lower horizontal plate 112. The upper horizontal plate 111 and the lower horizontal plate 112 cooperate with the vertical plate 121 to form a fixed rectangular frame. A right column plate 115 and a left column plate 116 are arranged side by side along the vertical direction on the back of the fixed rectangular frame. The upper section of the right column plate 115 is connected to the upper horizontal plate 111 through a right column plate stiffener 113, the middle section is connected to the upper horizontal plate 111 through a horizontal stiffener 117, and the lower section is connected to the upper horizontal plate 111 through the horizontal stiffener 117. The upper end of the left column plate 116 is connected to the upper horizontal plate 111 via the left column plate stiffener 114, the middle section is connected to the upper horizontal plate 111 via the horizontal stiffener 117, and the lower section is connected to the lower horizontal plate 112 via the horizontal stiffener 117. Both ends of the back of the upper horizontal plate 111 are provided with partition plates 119 for installing partition plate joints. The partition plate joints are connected to the left adjusting cylinder 4 and the right adjusting cylinder 5 via pipelines. Furthermore, a chain hanging plate 118 for installing the chain is provided near the partition plate 119.

[0056] In addition, in order to install the rotating shaft assembly 14 in conjunction with the rotating fork carriage 2, it is preferable to have a through hole in the lower cross plate 112 for the rotating shaft assembly 14 to pass through.

[0057] Furthermore, preferably, both the right column plate stiffener 113 and the left column plate stiffener 114 are provided with a base plate 122. One side of the base plate 122 is connected to the column plate stiffener through a mounting plate stiffener 124, and the other side is provided with a rotary cylinder mounting plate 123 for mounting the rotary cylinder mounting pin 12 and the rotary cylinder baffle 13.

[0058] In practical use, the rotatable hydraulic adjustable fork is mounted on the forklift mast. To ensure that the rotating fork carriage 2 moves synchronously when the fixed fork carriage 1 moves, and to guarantee the stability and smoothness of the reciprocating motion, it is preferable to have axle heads 120 for mounting main rollers on the top and bottom of the outer sides of the right column plate 115 and the left column plate 116. The main rollers are configured to roll within the forklift mast as the fixed fork carriage 1 moves up and down. Furthermore, mounting holes for mounting side rollers are provided near the axle heads 120. In this way, multiple side rollers can be added to assist the original main roller rolling, making the rotatable hydraulic adjustable fork more stable and efficient when moving or adjusting.

[0059] See Figure 5 and Figure 6 In this embodiment, the preferred rotating fork carriage 2 includes an upper crossbeam assembly 211 and a lower crossbeam 213. The upper crossbeam assembly 211 and the lower crossbeam 213 are fitted together with the side plate 212 to form a rotating rectangular frame. The lower crossbeam 213 has through holes and threaded holes. The rotating shaft assembly 14 is configured to pass through the through holes on the lower crossbeam 213 and the lower cross plate 112 in sequence and be fixed by bolts and threaded holes. A truss plate 214 for installing the truss 3 is provided between the two side plates 212. A pair of symmetrical rotating cylinder mounting plates 123 for installing the rotating cylinder 11 are provided on the top inner side of the two side plates 212. Adjusting cylinder mounting support assemblies 215 for installing the left adjusting cylinder 4 and the right adjusting cylinder 5 are provided on the middle and bottom inner sides, respectively.

[0060] like Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, the aforementioned rotating shaft assembly 14 preferably includes a fixing plate 141 and a rotating shaft 142. The fixing plate 141 has a central circular hole, through which the rotating shaft 142 passes and is welded and fixed. A pair of through holes for bolts to pass through are provided on both sides of the central circular hole.

[0061] The left side of the front end face of the rotating shaft 142 is provided with a pin-pulling hole, which is used to pull the rotating shaft assembly 14 out of the rotating fork carriage 2 after the bolts are removed, so as to facilitate disassembly, adjustment and maintenance of parts;

[0062] The right side of the front end face of the rotating shaft 142 is provided with a lubrication hole for adding grease to the rotating mechanism for lubrication.

[0063] The middle section of the rotating shaft 142 has a stepped surface for storing grease; a small round hole connected to the lubrication hole is formed on the stepped surface for the grease to flow out.

[0064] The two ends of the rotating shaft 142 are chamfered for guiding installation, avoiding difficulty in inserting and passing through the through hole, and reducing the difficulty of operation.

[0065] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A rotatable hydraulic pitch fork, characterized in that, The rotatable hydraulic adjustable fork includes a fixed fork carriage (1) and a rotating fork carriage (2). The bottom center of the rotating fork carriage (2) is rotatably connected to the bottom center of the fixed fork carriage (1) via a rotating shaft assembly (14). The top two ends of the rotating fork carriage (2) are respectively connected to the top of the fixed fork carriage (1) via rotating cylinders (11). Furthermore, the two rotating cylinders (11) are arranged in series to drive one side to extend while the other side extends. The side is shortened synchronously; the rotating fork carriage (2) is provided with a spool (3), the roots of the left fork (6) and the right fork (7) can be slidably sleeved on the spool (3), and the tips of both extend in a direction perpendicular to the rotating fork carriage (2). The middle section of the left fork (6) is connected to the right end of the rotating fork carriage (2) through the right adjustment cylinder (5), and the middle section of the right fork (7) is connected to the left end of the rotating fork carriage (2) through the left adjustment cylinder (4).

2. The rotatable hydraulic pitch fork of claim 1, wherein, The rotatable hydraulic adjustable fork also includes a spool baffle (10), which is detachably mounted on the rotating fork carriage (2) by bolts and is configured to limit the spool (3).

3. The rotatable hydraulic pitch fork of claim 1, wherein, The bottom of both the left adjusting cylinder (4) and the right adjusting cylinder (5) are connected to the rotating fork carriage (2) through adjusting cylinder mounting pins (8) and adjusting cylinder baffles (9).

4. The rotatable hydraulic pitch fork of claim 1, wherein, The bottom of the rotary cylinder (11) is connected to the fixed fork carriage (1) through a rotary cylinder mounting pin (12) and a rotary cylinder baffle (13), and the cylinder head is connected to the rotary fork carriage (2).

5. The rotatable hydraulic pitch fork of claim 4, wherein, The fixed forklift (1) includes an upper horizontal plate (111) and a lower horizontal plate (112). The upper horizontal plate (111) and the lower horizontal plate (112) cooperate with the vertical plate (121) to form a fixed rectangular frame. The back of the fixed rectangular frame is provided with a right column plate (115) and a left column plate (116) arranged side by side along the vertical direction. The upper section of the right column plate (115) is connected to the upper horizontal plate (111) through a right column plate stiffener (113), the middle section is connected to the upper horizontal plate (111) through a horizontal stiffener (117), and the lower section is connected to the lower horizontal plate (116) through a horizontal stiffener (117). 12) The upper end of the left column plate (116) is connected to the upper horizontal plate (111) through the left column plate stiffener (114), the middle section is connected to the lower horizontal plate (112) through the horizontal stiffener (117), and the lower section is connected to the lower horizontal plate (112) through the horizontal stiffener (117). Both ends of the back of the upper horizontal plate (111) are provided with partition plates (119) for installing partition plate joints. The partition plate joints are connected to the pipelines of the left adjusting cylinder (4) and the right adjusting cylinder (5). Furthermore, a chain hanging plate (118) for installing chains is provided near the partition plate (119).

6. The rotatable hydraulic pitch fork of claim 5, wherein, The lower horizontal plate (112) has a through hole for the rotating shaft assembly (14) to pass through.

7. The rotatable hydraulic pitch fork of claim 5, wherein, Both the right column plate stiffener (113) and the left column plate stiffener (114) are provided with a base plate (122). One side of the base plate (122) is connected to the column plate stiffener through a mounting plate stiffener (124), and the other side is provided with a rotary cylinder mounting plate (123) for mounting the rotary cylinder mounting pin (12) and the rotary cylinder baffle (13).

8. The rotatable hydraulic pitch fork of claim 5, wherein, The top and bottom of the outer sides of the right column plate (115) and the left column plate (116) are provided with axle heads (120) for mounting the main rollers. The main rollers are configured to roll within the mast of the forklift as the fixed fork carriage (1) moves up and down. Furthermore, mounting holes for mounting side rollers are provided near the axle heads (120).

9. The rotatable hydraulic pitch fork of claim 6, wherein, The rotating fork frame (2) includes an upper crossbeam assembly (211) and a lower crossbeam (213). The upper crossbeam assembly (211) and the lower crossbeam (213) are fitted together with the side plate (212) to form a rotating rectangular frame. The lower crossbeam (213) has through holes and threaded holes. The rotating shaft assembly (14) is configured to pass through the through holes on the lower crossbeam (213) and the lower cross plate (112) in sequence and be fixed with bolts to the threaded holes. A spool plate (214) for installing the spool (3) is provided between the two side plates (212). A pair of symmetrical rotating cylinder mounting plates (123) for installing the rotating cylinder (11) are provided on the top inner side of the two side plates (212). Adjusting cylinder mounting support assemblies (215) for installing the left adjusting cylinder (4) and the right adjusting cylinder (5) are provided in the middle and bottom inner sides, respectively.

10. The rotatable hydraulic pitch fork of claim 9, wherein, The rotating shaft assembly (14) includes a fixed plate (141) and a rotating shaft (142). The fixed plate (141) has a central circular hole, through which the rotating shaft (142) passes and is welded and fixed. A pair of through holes for bolts to pass through are provided on both sides of the central circular hole. The left side of the front end face of the rotating shaft (142) is provided with a pin-pulling hole for pulling out the rotating shaft assembly (14) after the bolts are removed from the rotating fork carriage (2); The right side of the front end face of the rotating shaft (142) is provided with a lubrication hole for adding grease to the rotating mechanism; The middle section of the rotating shaft (142) has a stepped surface for storing the grease; a small round hole connected to the lubrication hole is formed on the stepped surface for the grease to flow out. The two ends of the rotating shaft (142) are chamfered for guiding installation.

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