An automatic conveyor chain tensioning device for special vehicles

Abstract

The invention discloses an automatic conveyor chain tensioning device for special vehicles, wherein two driving device base sliding guide rails are respectively arranged at both ends of an inner side of a frame, a driving device base is arranged between the two driving device base sliding guide rails, a driving device is arranged above the driving device base, two driving device base sliding wear-resistant sleeves are respectively connected to the outer sides of both ends of the driving device base, the two driving device base sliding wear-resistant sleeves are respectively in contact with the two driving device base sliding guide rails, two tensioning device articulated frames are respectively arranged at both ends of the driving device, and the two tensioning device articulated frames are respectively connected to two tensioning hydraulic cylinder piston rods through pin shafts. The invention can effectively prevent tooth jumping, chain dropping failure and conveyor chain roller derailment failure, has a simple structure and reliable operation, and can automatically adjust the conveyor chain tensioning force during normal unidirectional operation of the conveyor chain and forward and reverse conversion processes.

Description

Technical Field

[0001] The invention relates to the technical field of special vehicles, in particular to an automatic conveyor chain tensioning device for special vehicles. Background Art

[0002] Special vehicles refer to vehicles whose overall dimensions, weight, etc. exceed the design vehicle limits and vehicles for special purposes. They are specially made or modified, equipped with fixed devices and equipment, and whose main function is not to carry people or goods. Special vehicles generally have special signs or special models. They refer to vehicles that perform special duties and hang special vehicle license plates, and are equipped with sirens and sign lights, such as ambulances, fire trucks, police cars, engineering rescue vehicles, military supervision vehicles, etc.

[0003] Some special vehicles such as dump trucks use conveyor chains to drive unloading devices to unload materials in the vehicle. The traditional tensioning system that changes the slack and verticality of the conveyor chain on one side is not easy to adjust, especially when the center distance between the main and driven sprocket shafts is large and the tensioning adjustment stroke is limited by the installation space. For example, under vehicle-mounted conditions, and when forward and reverse reciprocating operation is required, the tensioning system cannot achieve the expected tensioning effect, causing the conveyor chain to run unsteadily, make loud noises, shorten its service life, and even cause tooth skipping, chain failure, and roller derailment failure.

[0004] Therefore, in order to overcome the shortcomings of the above-mentioned technology, a tensioning device was designed to effectively prevent tooth jumping, chain falling failure and conveyor chain roller derailment failure. The device has a simple structure and reliable operation. It can automatically adjust the tensioning force of the conveyor chain during normal unidirectional operation of the conveyor chain and during forward and reverse conversion. This is exactly the problem that the inventor wants to solve. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an automatic conveyor chain tensioning device for special vehicles, which can effectively prevent tooth jumping, chain falling failure and conveyor chain roller derailment failure, has a simple structure and reliable operation, and can automatically adjust the conveyor chain tensioning force during normal unidirectional operation of the conveyor chain and forward and reverse conversion processes.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an automatic conveyor chain tensioning device for special vehicles, which includes a driving device base sliding guide rail, a driving device base sliding wear-resistant sleeve, a driving device base, a tensioning hydraulic cylinder piston rod, a tensioning hydraulic cylinder cylinder barrel, a driving device base adjustable limit block, a driving device base limit baffle, a frame, and a limit block fixing bolt. The tensioning hydraulic cylinder piston rod and the tensioning hydraulic cylinder cylinder barrel constitute a tensioning hydraulic cylinder, two driving device base sliding guide rails are respectively arranged at the inner ends of the frame, a driving device base is arranged between the two driving device base sliding guide rails, and a driving device is arranged above the driving device base. Two drive device base sliding wear-resistant sleeves are respectively connected to the outer sides of both ends of the drive device base, and the two drive device base sliding wear-resistant sleeves are respectively in contact with two drive device base sliding guide rails, and two tensioning device articulated frames are respectively provided at both ends of the drive device, and the two tensioning device articulated frames are respectively connected to two tensioning hydraulic cylinder piston rods through pin shafts, one end of the two tensioning hydraulic cylinder piston rods are respectively arranged on the inner sides of the two tensioning hydraulic cylinder cylinder barrels, and the bottom ends of the two tensioning hydraulic cylinder cylinder barrels are respectively hingedly connected to the cross beams on the frame, and the drive device is provided with a drive device base limit baffle, and a drive device base adjustable limit block is provided on the side of the drive device base limit baffle, and the drive device base adjustable limit block is connected and fixed to the frame through the limit plate fixing bolts, and the drive device base adjustable limit block is in contact with the drive device base limit baffle.

[0007] Furthermore, when the driving device is in a transition state of switching between forward and reverse motion, there is a gap between the adjustable limit block of the driving device base and the limit baffle of the driving device base, and the piston rods of the two tensioning hydraulic cylinders are extended to respectively support the two tensioning device articulated frames arranged on the driving device.

[0008] Furthermore, the driving device can slide on the inner side of the sliding guide rail of the driving device base through the sliding wear-resistant sleeve of the driving device base.

[0009] Furthermore, one end of the tensioning oil hydraulic cylinder barrel is connected to the output end of the hydraulic system.

[0010] The beneficial effects of the present invention are:

[0011] 1. The present invention adopts a movable driving device, which cooperates with a hydraulic cylinder fixed on the frame. When the conveyor chain operates in forward and reverse directions, the driving device is provided with tensioning force to control the tension of the chain, thereby effectively preventing tooth jumping, chain falling failure and conveyor chain roller derailment failure. The present invention has a simple structure and reliable operation, and can automatically adjust the tension of the conveyor chain during normal unidirectional operation of the conveyor chain and the forward and reverse conversion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Figure 2 yes Figure 1 Section view at AA in the middle.

[0014] Figure 3 yes Figure 1 Cross-sectional view at BB in the middle.

[0015] Figure 4 It is a schematic diagram of the structure of the forward and reverse conversion transition state of the present invention.

[0016] Explanation of the reference numerals: 1-sliding guide rail of the driving device base; 2-sliding wear-resistant sleeve of the driving device base; 3-driving device base; 4-tensioning hydraulic cylinder piston rod; 5-tensioning hydraulic cylinder cylinder barrel; 6-adjustable limit block of the driving device base; 7-limit baffle of the driving device base; 8-upper side of the conveying chain; 9-lower side of the conveying chain; 10-frame; 11-limit block fixing bolt. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with specific embodiments, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

[0018] See also Figures 1 to 4 It is a schematic diagram of the structure of the present invention. Figure 1 Sectional view at AA, Figure 1The cross-sectional view at the middle BB, the schematic diagram of the structure of the forward and reverse transition states, which includes the driving device base sliding guide rail, the driving device base sliding wear-resistant sleeve, the driving device base, the tensioning hydraulic cylinder piston rod, the tensioning hydraulic cylinder cylinder barrel, the driving device base adjustable limit block, the driving device base limit baffle, the frame, the limit block fixing bolts, the tensioning hydraulic cylinder piston rod and the tensioning hydraulic cylinder cylinder barrel constitute the tensioning hydraulic cylinder, two driving device base sliding guide rails are respectively arranged at the inner ends of the frame, the driving device base is arranged between the two driving device base sliding guide rails, and the driving device is arranged above the driving device base. Two driving device base sliding wear-resistant sleeves are respectively connected to the outer sides of both ends of the driving device base, and the two driving device base sliding wear-resistant sleeves are respectively in contact with the two driving device base sliding guide rails, and two tensioning device articulated frames are respectively provided at both ends of the driving device, and the two tensioning device articulated frames are respectively connected to two tensioning hydraulic cylinder piston rods through pin shafts, one end of the two tensioning hydraulic cylinder piston rods are respectively arranged on the inner sides of the two tensioning hydraulic cylinder cylinder barrels, and the bottom ends of the two tensioning hydraulic cylinder cylinder barrels are respectively hingedly connected to the cross beams on the frame, and a driving device base limit baffle is provided on the driving device, and an adjustable driving device base limit block is provided on the side of the driving device base limit baffle, and the adjustable driving device base limit block is connected and fixed to the frame through the limit plate fixing bolts, and the adjustable driving device base limit block is in contact with the driving device base limit baffle.

[0019] When the driving device is in a transition state of switching between forward and reverse motion, there is a gap between the adjustable limit block of the driving device base and the limit baffle of the driving device base, and the piston rods of the two tensioning hydraulic cylinders are extended to respectively support the two tensioning device articulated frames arranged on the driving device. The driving device can slide on the inner side of the sliding guide rail of the driving device base through the sliding wear-resistant sleeve of the driving device base, and one end of the cylinder barrel of the tensioning oil hydraulic cylinder is connected to the output end of the hydraulic system.

[0020] The technical solution of the present invention is as follows: the piston rod and cylinder barrel of the conveyor chain tensioning hydraulic cylinder are respectively hinged to the fixed hinge support fixed on the drive device base and the frame through the locking shaft, and the drive device base together with its sliding wear-resistant sleeve can slide forward and backward along its sliding guide rail (fixed on the left side of the frame and the lower part of the front end of the longitudinal beam). During installation, adjust the working pressure of the tensioning hydraulic cylinder hydraulic circuit so that the piston rod extends a certain stroke from the cylinder barrel, so that the conveyor chain reaches the preset tensioning force. At this time, adjust the longitudinal position of the limit block by adjusting the drive device base so that it contacts the limit baffle fixed on the drive device base and then adjusts it to a certain distance H, and fixes it to the frame with a bolt group. When the conveyor sprocket and chain are running forward or reverse, the reaction force of the longitudinal traction force on the tight side of the conveyor chain exceeds the preset tensioning force, so that the drive device base (the upper limit plate) moves to the frame (the upper limit block) by an "empty stroke" H and then contacts each other, and the conveyor chain reaches an appropriate initial tensioning state and continues to operate unidirectionally, that is, the normal conveyor chain traction force work process is completed. Figure 1 shown.

[0021] When the conveyor sprocket and chain are switched from the forward or reverse running state, the reaction force of the longitudinal traction force of the conveyor chain undergoes a process of changing from large to small and then from small to large because the tight side and loose side of the conveyor chain enter a mutual switching state. During this transition process, initially, when the reaction force of the longitudinal traction force of the conveyor chain is less than the preset tensioning force of the tensioning hydraulic cylinder, the piston rod is pushed out until it reaches a balance with the preset tensioning force. The longitudinal spacing between the adjustable limit block of the drive device base and the limit baffle fixed on the drive device base is H, and the reaction force of the longitudinal traction force of the conveyor chain continues to increase, causing the drive device base (the upper limit plate) to move the "empty stroke" H toward the frame (the upper limit block) and then contact each other. The conveyor chain reaches the appropriate initial tensioning state again, completing the reversal of the conveyor sprocket and chain, that is, the transition process of the tight side and loose side of the conveyor chain. Continue unidirectional operation, that is, enter the next normal conveyor chain traction force work process. If Figure 2 shown.

[0022] Since the conveyor chain is properly tensioned regardless of whether it is in a unidirectional operation state or in a transition state between forward and reverse operation, the meshing movement of the sprocket and the chain can be carried out smoothly, which not only effectively prevents tooth jumping, chain falling failure and roller derailment failure during the operation of the conveyor chain, but also reduces the operation noise of the conveyor chain and extends the service life of the conveyor chain.

[0023] The present invention adopts a movable driving device in conjunction with a hydraulic cylinder fixed on a frame, and provides tensioning force to the driving device when the conveyor chain operates in forward and reverse directions, thereby controlling the tension of the chain, and effectively preventing tooth jumping, chain falling failure, and conveyor chain roller derailment failures. The present invention has a simple structure and reliable operation, and can automatically adjust the conveyor chain tensioning force during normal unidirectional operation of the conveyor chain and the forward and reverse conversion process.

Claims

1. An automatic conveyor chain tensioning device for special vehicles, characterized in that: It includes a driving device base sliding guide rail, a driving device base sliding wear-resistant sleeve, a driving device base, a tensioning hydraulic cylinder piston rod, a tensioning hydraulic cylinder cylinder barrel, an adjustable limit block of the driving device base, a driving device base limit baffle, a frame, and a limit block fixing bolt. The tensioning hydraulic cylinder piston rod and the tensioning hydraulic cylinder cylinder barrel constitute a tensioning hydraulic cylinder. Two driving device base sliding guide rails are respectively arranged at both ends of the inner side of the frame, a driving device base is arranged between the two driving device base sliding guide rails, a driving device is arranged above the driving device base, two driving device base sliding wear-resistant sleeves are respectively connected to the outer sides of the two ends of the driving device base, and the two driving device base sliding wear-resistant sleeves are respectively in contact with the two driving device base sliding guide rails, two tensioning device articulated frames are respectively arranged at both ends of the driving device, and the two tensioning device articulated frames are respectively connected to two tensioning hydraulic cylinder piston rods through pin shafts, one end of the two tensioning hydraulic cylinder piston rods are respectively arranged on the inner sides of the two tensioning hydraulic cylinder cylinder barrels, and the bottom ends of the two tensioning hydraulic cylinder cylinder barrels are respectively hingedly connected to the crossbeams on the frame, and the driving device A limit baffle plate of a driving device base is arranged on the top, and an adjustable limit block of the driving device base is arranged on the side of the limit baffle plate of the driving device base. The adjustable limit block of the driving device base is connected and fixed to the frame through the limit plate fixing bolts. The adjustable limit block of the driving device base contacts the limit baffle plate of the driving device base. When the driving device is in a transition state of switching between forward and reverse motions, there is a gap between the adjustable limit block of the driving device base and the limit baffle plate of the driving device base. The piston rods of the two tensioning hydraulic cylinders are extended to respectively support the limit blocks arranged on the driving device. The two tensioning device articulated frames, during this transition process, initially, when the reaction force of the longitudinal traction force of the conveyor chain is less than the preset tensioning force of the tensioning hydraulic cylinder, the piston rod is pushed out until it reaches a balance with the preset tensioning force. The longitudinal spacing between the adjustable limit block of the drive device base and the limit baffle fixed on the drive device base is H, and the reaction force of the longitudinal traction force of the conveyor chain continues to increase, causing the limit plate of the drive device base to move toward the frame limit block after an empty stroke H and then contact each other, and the conveyor chain reaches the appropriate initial tensioning state again, completing the reversal of the conveyor sprocket and chain.

2. According to claim 1, the automatic conveyor chain tensioning device for special vehicles is characterized in that: The driving device can slide on the inner side of the driving device base sliding guide rail through the driving device base sliding wear-resistant sleeve.

3. The automatic conveyor chain tensioning device for special vehicles according to claim 1, characterized in that: One end of the tensioning hydraulic cylinder barrel is connected to the output end of the hydraulic system.

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