Forklift gantry chain tensioning device

Abstract

The invention relates to the technical field of forklift door frames, and discloses a forklift door frame chain tensioning device which comprises a door frame body and is characterized in that chain tensioners are symmetrically arranged on the side walls of the door frame body; the portal frame body comprises an outer portal frame, a middle portal frame, an inner portal frame, a pallet fork frame, a pallet fork, a goods blocking frame, a front lifting oil cylinder, a front cylinder chain, a front cylinder chain wheel, a rear lifting oil cylinder, a rear cylinder chain and a rear cylinder chain wheel, a lower cross beam and a middle cross beam are fixed in the inner portal frame, the front lifting oil cylinder is fixed on the side wall of the lower cross beam, and the rear lifting oil cylinder is fixed on the side wall of the middle cross beam. A front cylinder chain hanging plate is fixed to the side wall of the middle of the front lifting oil cylinder, the front cylinder chain hanging plate and the middle cross beam are fixed through a threaded installation bolt and a penetrating nut, a piston rod is arranged at the top of the front lifting oil cylinder, and a front cylinder chain wheel is arranged at the top of the piston rod. The chain tensioner is additionally arranged, oil leakage faults of the oil cylinder are reduced, the product service life is prolonged, the application range is wide, and the assembly method is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of forklift mast, and particularly to a chain tensioning device for forklift mast. Background Art

[0002] The process of forklift operation is the process of the lifting and lowering of the forklift mast cylinder. According to the actual operation conditions of customers, masts with different configured heights are selected. There is a working condition where the customer uses the forklift forks to lift or stack bagged materials. In this working condition, when the customer operates the forklift to unload goods at a high position, in order to prevent the abnormal rubbing of the goods by the forks when the forklift retreats and the forks are withdrawn, resulting in the tipping of the goods, usually the forks are placed on the top of the goods and slid out until they are separated from the goods, rather than raising the forks to a certain height and then retreating the forklift to withdraw the forks. During this process, the driver continuously retreats the forklift. During the process of the forks sliding out, the forks and the fork carriage are supported by the goods in the vertical direction, that is, the mast chains are always in a slack state. When the driver continuously retreats the forklift and at the moment when the forks slide along the top surface of the goods until the fork tips are separated from the goods (the original slack state of the chains), the forks, together with the fork carriage and the chains, form a free fall under the action of gravity until the chains are tightened again. This process is likely to cause chain oscillation. When the chain oscillates, the chain connecting plate hits the piston rod of the cylinder, resulting in injury to the piston rod. As the lifting frequency of the cylinder increases, the cylinder seal is damaged by the injured piston rod until the cylinder leaks oil; To solve the above problems, a chain tensioning device for forklift mast is designed. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention provides a chain tensioning device for forklift mast.

[0004] The chain tensioning device for forklift mast provided by the present invention includes a mast body, and chain tensioners are symmetrically arranged on the side walls of the mast body; The mast body includes an outer mast, a middle mast, an inner mast, a fork carriage, forks, a goods retaining shelf, a front lifting cylinder, a front cylinder chain, a front cylinder sprocket, a rear lifting cylinder, a rear cylinder chain, and a rear cylinder sprocket; A lower cross beam and a middle cross beam are fixedly arranged inside the inner mast. The front lifting cylinder is fixed on the side wall of the lower cross beam. A front cylinder chain hanging plate is fixed on the middle side wall of the front lifting cylinder. The front cylinder chain hanging plate and the middle cross beam are fixed by a threaded mounting bolt and a through nut. A piston rod is arranged at the top of the front lifting cylinder. A front cylinder sprocket is arranged at the top of the piston rod. The front cylinder chain is wound around the surface of the front cylinder sprocket. One end of the front cylinder chain is fixed with a chain end joint. The other end of the front cylinder chain is fixedly connected with the fork carriage. The chain end joint penetrates through the front cylinder chain plate and extends into the chain tensioner. A chain double nut is threadedly mounted on the surface of the chain end joint and below the front cylinder chain plate; The chain tensioner includes a sleeve and a movable seat threadedly installed at the bottom of the chain end joint. A cover is fixed to the inner bottom of the sleeve. A screw is threadedly installed in the middle of the cover. A double nut is threadedly installed at the bottom of the screw and below the cover. A pull seat is threadedly installed at the top of the screw. A plurality of springs are sleeved between the pull seat and the movable seat.

[0005] Preferably, an assembly groove is formed at the bottom of the pull seat, and an assembly hole is formed on the surface of the cover.

[0006] Preferably, the middle gantry is embedded in the outer gantry, the inner gantry is embedded in the middle gantry, the fork carriage is embedded in the inner gantry, the side walls of the fork carriage are fixed with the forks and the goods retaining shelves, and main rollers and side rollers are installed between the outer gantry and the middle gantry, between the middle gantry and the inner gantry, and between the inner gantry and the fork carriage.

[0007] Preferably, the middle gantry is disposed between the outer gantry and the inner gantry, and the inner gantry, the middle gantry and the outer gantry are staggered by 10 mm in sequence.

[0008] Preferably, the rear lifting oil cylinder is fixed to the bottom side wall of the outer gantry. An upper cross beam is fixed inside the middle gantry. The rear cylinder sprocket is fixed to the side wall of the upper cross beam. The rear cylinder chain is wound around the surface of the rear cylinder sprocket. The two ends of the rear cylinder chain are respectively connected to the inner gantry and the outer gantry.

[0009] Preferably, the movable seat includes a movable base, and a plurality of movable support plates are fixed to the surface of the movable base. A lower sleeving hole is formed in the side wall of each movable support plate.

[0010] Preferably, the pull seat includes a pull base, and a plurality of pull support plates are fixed to the surface of the pull base. An upper sleeving hole is formed in the side wall of each pull support plate.

[0011] Preferably, the springs are sleeved between the upper sleeving holes and the lower sleeving holes corresponding to each other in the vertical direction.

[0012] Preferably, a through hole for sleeving the chain end joint is formed on the surface of the front cylinder hanging chain plate, and the diameter value of the through hole is smaller than the diameter value of the chain double nut.

[0013] Preferably, a pin hole is formed at the bottom of the chain end joint and below the movable seat, and a split pin is inserted into the pin hole.

[0014] Preferably, a chain limiting plate is fixed above the front cylinder sprocket.

[0015] Compared with the prior art, the beneficial technical effects of the present invention: 1. Add a chain tensioning device on the existing gantry. The original gantry structure does not need to be changed. Therefore, the chain tensioning device is applicable to existing products and new products, with a wide range of applications and a simple assembly method. 2. Adding a chain tensioner can prevent the chain from oscillating and generating an amplitude under abnormal working conditions, which may cause the chain to be hit. 3. Adding a chain tensioner enables the gantry to be applicable to special and harsh working conditions, improving the product reliability and expanding its applications. 4. Adding a chain tensioner can reduce the oil leakage failure of the oil cylinder and extend the service life of the product. Description of the Drawings

[0016] Figure 1 This is the front view of the overall structure of the forklift gantry chain tensioning device proposed by the present invention.

[0017] Figure 2 This is the left view of the overall structure of the forklift gantry chain tensioning device proposed by the present invention.

[0018] Figure 3 This is the partial cross-sectional view of the forklift gantry chain tensioning device proposed by the present invention.

[0019] Figure 4 This is the Figure 3 partial enlarged view at position A of the forklift gantry chain tensioning device proposed by the present invention.

[0020] Figure 5 This is the partial cross-sectional view of the chain tensioner of the forklift gantry chain tensioning device proposed by the present invention from the first perspective.

[0021] Figure 6 This is the partial cross-sectional view of the chain tensioner of the forklift gantry chain tensioning device proposed by the present invention from the second perspective.

[0022] Figure 7 This is the structural schematic diagram of the moving seat of the forklift gantry chain tensioning device proposed by the present invention.

[0023] Figure 8 This is the structural schematic diagram of the pulling seat of the forklift gantry chain tensioning device proposed by the present invention.

[0024] In the figure: 1. Fork; 2. Fork carrier; 3. Goods retaining shelf; 4. Outer gantry; 5. Middle gantry; 6. Inner gantry; 6-1. Middle cross beam; 7. Front lifting oil cylinder; 7-1. Piston rod; 7-2. Front cylinder chain hanging plate; 8. Front cylinder chain; 8-1. Chain end joint; 9. Front cylinder sprocket; 10. Main roller; 11. Side roller; 13. Rear lifting oil cylinder; 14. Rear cylinder chain; 15. Rear cylinder sprocket; 16. Chain limit plate; 17. Through nut; 18. Bolt; 19. Chain double nut; 20. Split pin; 21. Chain tensioner; 21-1. Moving seat; 21-1-1. Moving base; 21-1-2. Moving support plate; 21-2. Spring; 21-3. Pulling seat; 21-3-1. Pulling base; 21-3-2. Pulling support plate; 21-4. Sleeve; 21-5. Cover; 21-6. Double nut; 21-7. Screw. Detailed implementation manner

[0025] Embodiment, refer to Figure 1-8 , a forklift gantry chain tensioning device, including a gantry body, and chain tensioners 21 are symmetrically arranged on the side walls of the gantry body; The gantry body includes an outer gantry 4, a middle gantry 5, an inner gantry 6, a fork carrier 2, a fork 1, a goods retaining shelf 3, a front lifting oil cylinder 7, a front cylinder chain 8, a front cylinder sprocket 9, a rear lifting oil cylinder 13, a rear cylinder chain 14, and a rear cylinder sprocket 15; A lower cross beam and a middle cross beam 6-1 are fixed inside the inner gantry 6. The front lifting oil cylinder 7 is fixed on the side wall of the lower cross beam. A front cylinder chain hanging plate 7-2 is fixed on the middle side wall of the front lifting oil cylinder 7. The front cylinder chain hanging plate 7-2 is fixed between the middle cross beam 6-1 by installing a bolt 18 and a through nut 17 through threads. A piston rod 7-1 is provided at the top of the front lifting oil cylinder 7. A front cylinder sprocket 9 is provided at the top of the piston rod 7-1. The front cylinder chain 8 is wound around the surface of the front cylinder sprocket 9. A chain end joint 8-1 is fixed at one end of the front cylinder chain 8. The other end of the front cylinder chain 8 is fixedly connected to the fork carrier 2. The chain end joint 8-1 penetrates through the front cylinder chain plate and extends into the chain tensioner 21. A chain double nut 19 is installed through threads on the surface of the chain end joint 8-1 and below the front cylinder chain plate. By installing the chain tensioner 21, the piston rod 7-1 is protected from being impacted by the front cylinder chain 8; The chain tensioner 21 includes a sleeve 21-4 and a movable seat 21-1 threadedly installed at the bottom of the chain end joint 8-1. A cover 21-5 is fixed to the inner bottom of the sleeve 21-4. A screw 21-7 is threadedly installed in the middle of the cover 21-5. A double nut 21-6 is threadedly installed at the bottom of the screw 21-7 and below the cover 21-5. A pull seat 21-3 is threadedly installed at the top of the screw 21-7. A plurality of springs 21-2 are sleeved between the pull seat 21-3 and the movable seat 21-1. The sleeve 21-4 is in pressing contact with the front cylinder chain hanging plate 7-2. Through the supporting installation of the chain end joint 8-1, the sleeve 21-4, and the spring 21-6, pressing contact is achieved. Among them, the limit travel distance of the chain end joint 8-1 (the travel distance is determined by the tightness of the front cylinder chain 8, that is, the distance that the front cylinder chain 8 needs to be moved downward from the relaxed state to the tensioned chain end joint 8-1) is less than the contraction length of the spring 21-2. The length of the sleeve 21-4 is determined according to the limit travel distance of the chain end joint 8-1 and the length of the spring 21-6. When properly matched, the chain end joint 8-1 moves down to the limit length to tension the front cylinder chain 8, and the sleeve 21-4 is still in pressing contact with the front cylinder chain hanging plate 7-2.

[0026] An assembly groove is formed at the bottom of the pull seat 21-3, and an assembly hole is formed on the surface of the cover 21-5. After the assembly is completed, the spring 21-2 may not be in a vertical state. When the spring 21-2 is stretched in a spiral shape, it may cause a plurality of springs 21-2 to be wound together and unable to be separated when the spring 21-2 is in a contracted state, resulting in the subsequent inoperability of the tensioning device. It is necessary to finely adjust the pull seat 21-3 after the assembly is completed. Refer to Figure 5 , during the assembly, a screwdriver can be inserted into the assembly hole and then into the assembly groove, and the screwdriver is swung to drive the pull seat 21-3 to rotate, thereby adjusting the position of the pull seat 21-3 to ensure that the pull support plate 21-3-2 and the movable support plate 21-1-2 are vertically aligned one by one to ensure that the spring 21-2 is in a vertical state after the assembly; it can also be adjusted during subsequent maintenance to facilitate maintenance.

[0027] The middle gantry 5 is embedded in the outer gantry 4, the inner gantry 6 is embedded in the middle gantry 5, the fork carriage 2 is embedded in the inner gantry 6. Forks 1 and a cargo retaining shelf 3 are fixed to the side wall of the fork carriage 2. Main rollers 10 and side rollers 11 are installed between the outer gantry 4 and the middle gantry 5, between the middle gantry 5 and the inner gantry 6, and between the inner gantry 6 and the fork carriage 2. The main rollers 10 are embedded in the channel steels of the outer gantry 4, the middle gantry 5, and the inner gantry 6. When the forklift gantry is carrying, the main rollers 10 act radially on the wing plate surfaces of the channel steels in the front and rear directions, limit the load bearing in the front and rear directions of the channel steel wing plates, and guide in the vertical direction inside the channel steel. When the forklift gantry is carrying, the side rollers 11 act radially on the web surfaces of the channel steels in the left and right directions, limit the load bearing in the left and right directions of the channel steel webs, and guide in the vertical direction inside the channel steel.

[0028] The middle mast 5 is placed between the outer mast 4 and the inner mast 6, and the inner mast 6, the middle mast 5 and the outer mast 4 are staggered by 10 mm in sequence.

[0029] The rear lifting cylinder 13 is fixed to the bottom side wall of the outer mast 4. An upper cross beam is fixed inside the middle mast 5. The rear cylinder sprocket 15 is fixed to the side wall of the upper cross beam. The rear cylinder chain 14 is wound around the surface of the rear cylinder sprocket 15. Both ends of the rear cylinder chain 14 are respectively connected to the inner mast 6 and the outer mast 4.

[0030] The moving seat 21-1 includes a moving base 21-1-1. A plurality of moving support plates 21-1-2 are fixed to the surface of the moving base 21-1-1. Lower sleeving holes are formed in the side walls of each moving support plate 21-1-2; the pulling seat 21-3 includes a pulling base 21-3-1. A plurality of pulling support plates 21-3-2 are fixed to the surface of the pulling base 21-3-1. Upper sleeving holes are formed in the side walls of each pulling support plate 21-3-2. The spring 21-2 is sleeved between the vertically corresponding upper sleeving holes and lower sleeving holes.

[0031] A through hole for sleeving the chain end joint 8-1 is formed in the surface of the front cylinder hanging chain plate 7-2. The diameter value of the through hole is smaller than the diameter value of the chain double nut 19, ensuring that the chain end joint 8-1 will not break away from the front cylinder hanging chain plate 7-2.

[0032] A pin hole is formed at the bottom of the chain end joint 8-1 and below the moving seat 21-1. A split pin 20 is inserted into the pin hole. The position of the moving seat 21-1 is restricted by inserting the split pin 20 to prevent the moving seat 21-1 from rotating and breaking away.

[0033] A chain limiting plate 16 is fixed above the front cylinder sprocket 9 to prevent the front cylinder chain 8 from breaking away from the front cylinder sprocket 9.

[0034] Working principle: The high-pressure hydraulic oil from the vehicle body in the mast is respectively supplied to the rear lifting cylinder 13 (the first group of hydraulic pipelines) and the front lifting cylinder 7 (the second group of hydraulic pipelines); the second group of hydraulic pipelines drives the front lifting cylinder 7 to lift, and drives the fork frame 2 and the fork 1 to lift through the front cylinder chain 8. After the stroke of the front lifting cylinder 7 is completed; then the first group of hydraulic pipelines makes the rear lifting cylinder 13 lift. The piston rod 7-1 of the rear lifting cylinder 13 jacks up the middle mast 5 to lift. After passing around the sprocket of the middle mast 5, the rear cylinder chain 14 drives the inner mast 6 to lift until the maximum lifting height is reached, meeting the requirements of the forklift fork 1 for shoveling and handling operations; The front lifting oil cylinder and the front cylinder hanging link plate 7-2 form a fixed assembly. Bolts 18 and through nuts 17 fasten the front cylinder hanging link plate 7-2 to the crossbeam of the inner gantry 6. The front cylinder chain 8 is in a tensioned state under the self-weight of the fork carriage 2 and the forks 1. The distance H2 is maintained between the seating surface C of the chain end joint 8-1 of the chain end joint 8-1 and the upper side D surface of the front cylinder hanging link plate 7-2 of the front cylinder hanging link plate 7-2. The vertical upper end surface of the chain tensioner 21 is tightly fastened against the lower side E surface of the front cylinder hanging link plate 7-2 of the front cylinder hanging link plate 7-2. The distance H1 between the vertical upper end surface of the chain tensioner 21 and the lower side surface B of the crossbeam of the inner gantry 6 of the inner gantry 6 only needs to satisfy H1≥0; Reference Figure 4 、 Figure 5 , the distance H2 between the seating surface C of the chain end joint 8-1 and the front cylinder hanging link plate 7-2. This state is the normal working state of the gantry. Since the front cylinder chain 8 is in a tensioned state, the chain double nut 19 abuts against the lower surface E of the front cylinder hanging link plate 7-2 to limit the chain end joint 8-1; in the chain tensioner 21, the moving seat 21-1 is arranged by screwing and abutting against the chain end joint 8-1 with the double nut 21-6. The lower end of the screw 21-7 is arranged in a vertically upward and mutually abutting manner in sequence through the double nut 21-6, the cover 21-5 and the sleeve 21-4 from bottom to top. The upper end of the screw 21-7 is threadedly connected to the pull seat 21-3. In the normal state of the gantry, one end of the spring 21-2 is connected to the moving seat 21-1 and the other end is connected to the pull seat 21-3, and the spring 21-2 is in a tensioned state. The magnitude of the force of the spring 21-2 depends on the self-weight of the chain and the friction between the chain and the sprocket. One end of the spring 21-2 in the sleeve 21-4 of the chain tensioner 21 is connected to the moving seat 21-1 and the other end is connected to the pull seat 21-3. The pulling force is transmitted to the sleeve 21-4 through the screw 21-7 and the pull seat 21-3, so that the sleeve 21-4 abuts tightly against the lower side E surface of the front cylinder hanging link plate 7-2 of the front cylinder hanging link plate 7-2. The threaded engagement length H4 between the screw 21-7 and the pull seat 21-3 is reliably connected. The cotter pin 20 of the chain end joint 8-1 is reasonably assembled to avoid interference with the surrounding spring 21-2; Reference Figure 3 、 Figure 6, the distance H2* between the seat surface C of the chain end joint 8-1 and the front cylinder chain hanging plate 7-2. This state is an abnormal working state of the gantry. When the forklift passes through obstacle blocks or bumpy road conditions, or when the customer is picking up bagged materials and other abnormal working states cause the chain to fight, loosen and vibrate, the chain is tightened under the action of the spring 21-2 of the chain tensioner 21 to prevent the chain product swing amplitude from hitting the piston rod 7-1 in this working condition. In this state, H2* < H2, and the chain double nut 19 on the surface of the chain end joint 8-1 instantaneously disengages from the front cylinder chain hanging plate 7-2 to generate a distance H3. The tension of the spring 21-2 is reasonably set so that the front cylinder chain 8 always clings to the sprocket and the front cylinder chain 8 is always in a tensioned state. Under special working conditions, the swing amplitude of the front cylinder chain 8 is greatly reduced or even eliminated, avoiding the phenomenon of piston injury. When the abnormal working state of the gantry returns to the normal working state, the distance between the seat surface C of the chain end joint 8-1 and the front cylinder chain hanging plate 7-2 tends from H2* to H2, H3 = 0, and the chain double nut 19 clings to the lower E surface of the front cylinder chain hanging plate 7-2.

[0035] Since the front cylinder chain 8 is in a tensioned state, the chain end joint 8-1 is limited by the chain double nut 19 clinging to the lower E surface of the front cylinder chain hanging plate 7-2; the moving seat 21-1 in the chain tensioner 21 is set by screwing with the chain end joint 8-1 and clinging to the double nut 21-6. The lower end of the screw 21-7 is sequentially and tightly arranged in the vertical direction from bottom to top through the double nut 21-6, the cover 21-5 and the sleeve 21-4. The upper end of the screw 21-7 is threadedly connected to the pull seat 21-3. In the normal state of the gantry, one end of the spring 21-2 is connected to the moving seat 21-1, and the other end is connected to the pull seat 21-3, and the spring 21-2 is in a tensioned state. The magnitude of the spring 21-2 force depends on the self-weight of the chain and the friction between the chain and the sprocket. One end of the spring 21-2 of the sleeve 21-4 of the chain tensioner 21 is connected to the moving seat 21-1, and the other end is connected to the pull seat 21-3. The tension is transmitted to the sleeve 21-4 through the screw 21-7 and the pull seat 21-3, so that the sleeve 21-4 clings to the lower E surface of the front cylinder chain hanging plate 7-2.

Claims

1. Forklift mast chain tensioning device, including a mast body, characterized in that, Chain tensioners are symmetrically arranged on the side walls of the gantry body; The gantry body includes an outer gantry, a middle gantry, an inner gantry, a fork carriage, forks, a goods retaining shelf, a front lifting oil cylinder, a front cylinder chain, a front cylinder sprocket, a rear lifting oil cylinder, a rear cylinder chain, and a rear cylinder sprocket; A lower cross beam and a middle cross beam are fixedly installed inside the inner gantry. The front lifting oil cylinder is fixed on the side wall of the lower cross beam. A front cylinder chain hanging plate is fixedly installed on the middle side wall of the front lifting oil cylinder. The front cylinder chain hanging plate is fixed between the middle cross beam by a threaded mounting bolt and a through nut. A piston rod is provided at the top of the front lifting oil cylinder. A front cylinder sprocket is provided at the top of the piston rod. The front cylinder chain is wound around the surface of the front cylinder sprocket. One end of the front cylinder chain is fixed with a chain end joint. The other end of the front cylinder chain is fixedly connected to the fork carriage. The chain end joint penetrates through the front cylinder chain plate and extends into the chain tensioner. A chain double nut is threadedly installed on the surface of the chain end joint and below the front cylinder chain plate; The chain tensioner includes a sleeve and a moving seat threadedly installed at the bottom of the chain end joint. A sealing cover is fixedly installed at the inner bottom of the sleeve. A screw is threadedly installed in the middle of the sealing cover. A double nut is threadedly installed at the bottom of the screw and below the sealing cover. A pulling seat is threadedly installed at the top of the screw. A plurality of springs are sleeved between the pulling seat and the moving seat.

2. The forklift mast chain tensioning device according to claim 1, characterized in that, An assembly groove is formed at the bottom of the pulling seat, and an assembly hole is formed on the surface of the sealing cover.

3. The forklift mast chain tensioning device according to claim 1, characterized in that, The middle gantry is embedded inside the outer gantry, the inner gantry is embedded inside the middle gantry, the fork carriage is embedded inside the inner gantry. The side walls of the fork carriage are fixed with the forks and the goods retaining shelf. Main rollers and side rollers are installed between the outer gantry and the middle gantry, between the middle gantry and the inner gantry, and between the inner gantry and the fork carriage.

4. The forklift mast chain tensioning device according to claim 1, characterized in that, The middle gantry is placed between the outer gantry and the inner gantry, and the inner gantry, the middle gantry, and the outer gantry are staggered by 10 mm in sequence.

5. The forklift mast chain tensioning device according to claim 1, characterized in that, The rear lifting oil cylinder is fixed on the bottom side wall of the outer gantry. An upper cross beam is fixedly installed inside the middle gantry. The rear cylinder sprocket is fixed on the side wall of the upper cross beam. The rear cylinder chain is wound around the surface of the rear cylinder sprocket. The two ends of the rear cylinder chain are respectively connected to the inner gantry and the outer gantry.

6. The forklift mast chain tensioning device according to claim 1, characterized in that, The moving seat includes a moving base, and a plurality of moving support plates are fixedly installed on the surface of the moving base. Lower sleeve holes are formed on the side walls of each of the moving support plates.

7. The forklift mast chain tensioning device according to claim 6, characterized in that, The pulling seat includes a pulling base, and a plurality of pulling support plates are fixedly installed on the surface of the pulling base. Upper sleeve holes are formed on the side walls of each of the pulling support plates.

8. The forklift mast chain tensioning device according to claim 7, characterized in that, The springs are sleeved between the upper sleeve holes and the lower sleeve holes corresponding to each other in the vertical direction.

9. The forklift mast chain tensioning device according to claim 1, characterized in that, A through hole for sleeving the chain end joint is formed on the surface of the front cylinder chain hanging plate, and the diameter value of the through hole is smaller than the diameter value of the chain double nut.

10. The forklift mast chain tensioning device according to claim 1, characterized in that, A pin hole is formed at the bottom of the chain end joint and below the moving seat, and a split pin is inserted into the pin hole.

11. The forklift mast chain tensioning device according to claim 1, characterized in that, A chain limiting plate is fixed above the front cylinder sprocket.

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