A telescopic belt conveyor

Abstract

This utility model proposes a telescopic belt conveyor, including a main frame; a telescopic frame that can extend and retract relative to the main frame; a telescopic mechanism for driving the telescopic frame to reciprocate, including a motor mounted on the main frame and a gear and rack transmission assembly connected to the motor; and a belt conveying mechanism including an electric roller and a ring conveyor belt, the conveyor belt being wrapped around the main frame and the telescopic frame. The electric roller is mounted on the main frame, and the electric roller integrates the conveyor motor inside its cylinder, serving as the sole drive wheel for driving the conveyor belt. By using an electric roller, the belt conveying drive system is completely integrated inside the roller, eliminating the need for an external drive system and significantly saving space. At the same time, the telescopic drive part also adopts a compact gear and rack design, ultimately making the overall structure much more compact and lightweight than the traditional dual external motor solution.

Description

Technical Field

[0001] This utility model relates to the field of belt conveyor structure, and in particular to a telescopic belt conveyor. Background Technology

[0002] Telescopic belt conveyors, especially in emergency rescue fields such as fire fighting, have extremely high requirements for equipment compactness and reliability.

[0003] Existing telescopic belt conveyors typically employ two separate drive systems. One system, consisting of an external motor, reducer, and chain drive mechanism, is dedicated to the extension and retraction of the conveyor belt. The other system, consisting of a second external motor, reducer, and coupling, drives the conveyor belt. Both drive units are traditional combinations of motor, reducer, and transmission components, each occupying a significant amount of physical space. This results in a large overall size and increased weight, making integration into space-constrained vehicles such as fire trucks extremely difficult. Furthermore, the chain drive mechanism used for extension and retraction is prone to wear, stretching, and tooth skipping under frequent start-stop or heavy-load conditions, leading to unstable extension and retraction or even jamming. This necessitates frequent maintenance and hinders emergency response. Utility Model Content

[0004] The present invention aims to solve the problems of bulky overall structure, low space utilization and poor operational reliability caused by the use of two separate, external drive units and chain transmission in existing telescopic belt conveyors.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A telescopic belt conveyor includes: a main frame; a telescopic frame that can extend and retract relative to the main frame; a telescopic mechanism for driving the telescopic frame to reciprocate, including a motor mounted on the main frame and a gear and rack transmission assembly connected to the motor; and a belt conveying mechanism including an electric roller and an annular conveyor belt, the conveyor belt being wrapped around the main frame and the telescopic frame, the electric roller being mounted on the main frame, the electric roller integrating the conveyor motor inside its cylinder and serving as the sole drive wheel for driving the conveyor belt.

[0006] Furthermore, the gear and rack transmission assembly includes a gear and a rack, the output shaft of the motor is fixedly connected to at least one gear via a transmission shaft, the telescopic frame is fixed to the rack, and the gear and rack mesh for transmission.

[0007] Furthermore, the motors and electric rollers are both located at the bottom of the main frame.

[0008] Furthermore, the wrap angle of the conveyor belt on the electric roller is greater than 170 degrees.

[0009] Furthermore, it also includes a driven roller assembly, which consists of several driven rollers, some of which are mounted on the main frame and others on the telescopic frame. The driven roller assembly is used to dynamically tension the conveyor belt when the telescopic frame moves.

[0010] Furthermore, the driven roller assembly includes roller one, roller two, and roller three. Roller one is rotatably connected to the bottom of the main frame; roller two and roller three are rotatably connected to the front and rear ends of the bottom of the telescopic frame, respectively, and the conveyor belt is fitted onto the electric roller, roller one, roller two, and roller three.

[0011] Furthermore, the surfaces of the electric rollers, roller one, roller two, and roller three are tapered.

[0012] Furthermore, a guide rail assembly is provided between the main frame and the telescopic frame. The guide rail assembly includes a guide rail one fixed to the main frame and a guide rail two fixed to the telescopic frame, with guide rail one and guide rail two in sliding contact.

[0013] Furthermore, guide rail one and guide rail two are made of steel, and their contact surfaces are covered with a wear-resistant layer.

[0014] Furthermore, it also includes a limiting mechanism for restricting the travel of the telescopic frame.

[0015] Compared with the prior art, the beneficial effects of this utility model include: 1. This utility model integrates the belt conveyor drive system (motor and reducer) into the inside of the roller by using an electric roller, completely eliminating the external drive system and saving a lot of space; at the same time, the telescopic drive part also adopts a compact gear and rack design, which makes the whole machine structure much more compact and lightweight than the traditional dual external motor solution.

[0016] 2. The telescopic function of this utility model adopts a rigid and precise gear + rack transmission, which eliminates the inherent defects of chain transmission and ensures smooth, accurate and long-lasting telescopic movement. The belt conveyor function adopts a mature electric roller 41, reducing external transmission links and thus lowering the failure rate.

[0017] 3. This utility model achieves dynamic automatic tensioning of the conveyor belt by utilizing the movement of the telescopic frame 2, ensuring stable conveying throughout the entire stroke range. Attached Figure Description

[0018] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The structural diagram shows the part of the belt conveyor with the main frame below it hidden.

[0019] Figure 2 for Figure 1 A magnified view of A in the middle.

[0020] Figure 3 This is a schematic diagram showing the position of the limiting mechanism relative to the belt conveyor.

[0021] Figure 4 This is a schematic diagram of the belt conveyor in the extended state.

[0022] Figure 5 This is a simplified diagram showing the positions of each roller in the extended state of the belt conveyor.

[0023] Figure 6 This is a schematic diagram of the belt conveyor in the retracted state.

[0024] Figure 7 This is a simplified diagram showing the positions of each roller in the retracted state of the belt conveyor.

[0025] Numbering on the map: 1. Main frame; 2. Telescopic frame; 3. Telescopic mechanism; 31. Motor; 32. Gear; 33. Rack; 4. Belt conveyor mechanism; 41. Electric roller; 42. Driven roller group; 421. Roller 1; 422. Roller 2; 423. Roller 3; 5. Limiting mechanism; 51. Front limit switch; 52. Rear limit switch; 53. Adjusting groove. Detailed Implementation

[0026] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0027] like Figures 1-7 The main frame 1 is the base of the entire equipment and is usually fixed to the ground of a fire truck or a designated factory area. The telescopic frame 2 is fitted inside or outside the main frame 1 and achieves smooth reciprocating linear movement between the two through a guide rail assembly, allowing the telescopic frame 2 to extend or retract relative to the main frame 1.

[0028] The telescopic mechanism 3 is responsible for driving the telescopic frame 2 to extend or retract relative to the main frame 1, and includes a motor 31, a gear 32, and a rack 33.

[0029] The motor 31 is installed in the bottom space of the main frame 1. The output shaft of the motor 31 drives a transmission shaft that spans the main frame 1 to rotate through a coupling or other transmission components. This driving method is existing technology. One or more gears 32 are fixed on the transmission shaft, and a rack 33 is fixed on the side wall or bottom surface of the telescopic frame 2. The gears 32 and rack 33 mesh and transmit power.

[0030] When the telescopic drive motor 31 is working, it drives the transmission shaft and gear 32 to rotate. The gear 32 drives the rack 33 to move, thereby pushing / pulling the telescopic frame 2 to extend or retract relative to the main frame 1. Compared with chain drive, this gear and rack meshing transmission method has higher transmission efficiency and more precise positioning.

[0031] The belt conveyor system 4 is responsible for material transfer and includes an electric roller 41 and a driven roller group 42.

[0032] The driven roller group 42 includes roller one 421, roller two 322, and roller three 423.

[0033] A large-diameter electric roller 41 is mounted on the bottom side of the main frame 10, for example, near the operating end. This electric roller 41 integrates the motor and reducer entirely inside the roller, resulting in a very compact structure. A circular conveyor belt passes over the electric roller 41 and the driven roller assembly 42 located below the main frame 1 and the telescopic frame 2. To ensure sufficient driving force and prevent conveyor belt slippage, the wrap angle of the conveyor belt on the electric roller 41 is designed to be greater than 170 degrees, approaching 180 degrees. When the electric roller 41 rotates, it drives the entire conveyor belt in a cyclical motion.

[0034] Roller 1 421 is rotatably connected to the bottom of the main frame 11, while rollers 2 422 and 3 423 are rotatably connected to the front and rear ends of the bottom of the telescopic frame 2, respectively. When the telescopic frame 2 extends / retracts, the distance between rollers 1 421 and 3 423 decreases / increases, allowing the conveyor belt wound on the electric roller 41 and driven roller group 42 to maintain appropriate tension, enabling the belt to have a dynamic automatic tensioning function and allowing the belt conveyor to work stably at any length.

[0035] Furthermore, in order to improve the conveying stability, the electric roller 41 and rollers 421, 322, and 423 in this embodiment are all designed as drum-shaped rollers or hammer-shaped rollers with a slight taper (i.e., the middle diameter is slightly larger than the diameters at both ends). This shape helps the conveyor belt to automatically center itself during operation and effectively prevents it from running off-center.

[0036] The guide rail assembly is used to ensure the smoothness and accuracy of the movement of the telescopic frame 20, and includes guide rail 11 and guide rail 21.

[0037] On the inner wall of the main frame 1, a guide rail 11, serving as a load-bearing and guiding reference, is bolted together. The guide rail 11 is made of high-strength materials such as 45# steel to ensure rigidity and durability. On the inner wall of the telescopic frame 2, a matching guide rail 21 is installed. The guide rail 21 is also made of high-strength materials such as 45# steel.

[0038] Preferably, the surfaces of guide rail 11 and guide rail 21 that come into contact with each other are coated with ultra-high molecular weight polyethylene material. By utilizing the extremely low coefficient of friction and excellent wear resistance of ultra-high molecular weight polyethylene, the extension and retraction process has low resistance and low noise, and no lubrication is required, which is superior to the traditional metal roller guide structure.

[0039] The design of the limiting mechanism 5 prevents the telescopic frame 2 from moving beyond its limits.

[0040] A front limit switch 51, a rear limit switch 52, and an adjustment groove 53 are provided on the main frame 1. The adjustment groove 53 is formed on the main frame 1, and the front limit switch 51 and the rear limit switch 52 are installed along the extension direction of the adjustment groove 53. The front / rear limit switches 51 and 52 are both located on the moving path of the guide rail 21. The positions of these two switches can be adjusted by means of bolts or other methods to adapt to the travel requirements under different working conditions.

[0041] Preferably, the front limit switch 51 and the rear limit switch 52 can be inductive / capacitive non-contact proximity switches.

[0042] Preferably, the front limit switch 51 and the rear limit switch 52 can be selected as contact-type micro switches or limit switches.

[0043] This embodiment preferably uses a non-contact switch with no mechanical wear, which has a longer service life and higher operational reliability.

[0044] The front limit switch 51 and the rear limit switch 52 are fixedly mounted on the side wall of the stationary main frame 1. One or more trigger blocks are fixedly mounted on the corresponding side wall of the moving guide rail 21. The material and size of the trigger block depend on the type of limit switch selected. This embodiment uses an inductive proximity switch, with the trigger block being a metal block located on one side of the adjustment groove 53 and the limit switch located on the other side. When the metal block moves to the adjustment groove 53, it will be sensed by the corresponding limit switch.

[0045] Specifically, the operation of the limit device 5 involves the following process: Retraction Limit State: The rear limit switch 52 is installed near the tail end of the main frame 1. When the telescopic frame 2 retracts inward, its trigger block gradually approaches the rear limit switch 52. When the distance between them reaches the sensing range of the switch, the rear limit switch 52 is triggered, outputting a signal to the control system. Upon receiving the signal, the control system immediately cuts off the power supply to the telescopic drive motor 31 in the retraction direction, the motor stops rotating, and thus precisely stops the telescopic frame 20 at the fully retracted position.

[0046] Extension limit state: The front limit switch 51 is installed near the front end of the main frame 1. Similarly, when the telescopic frame 2 extends outward to the predetermined length, the trigger block will trigger the front limit switch 51, and the control system will then cut off the power supply of the motor to the extension direction, completing the extension action.

[0047] Stroke adjustment: When it is necessary to change the maximum extension length of the belt conveyor to adapt to different working spaces, the operator only needs to loosen the locking bolt on the mounting base of the front limit switch 51, and then slide the switch back and forth along the adjustment groove 53, and then tighten it again. For example, moving the front limit switch 51 towards the tail end of the main frame will shorten the extension stroke; conversely, moving it towards the tail end will lengthen it.

[0048] The above operation involves using a switch to output a signal to the control system, and the control system then controls the start and stop status of motor 31. This operation method is based on PLC design and is existing technology, so it will not be described in detail.

[0049] The operation process of this equipment is as follows: When the conveyor belt needs to be extended, the operator starts motor 31, and gear 32 rotates to drive the telescopic frame 2 to extend smoothly until it reaches the predetermined position or triggers the front limit switch 51. When materials need to be conveyed, the electric roller 41 is started, and the conveyor belt begins to run; the retraction process is the reverse operation. The extension and conveying actions can be controlled independently or simultaneously.

[0050] In summary, the advantages of this equipment over existing telescopic belt conveyors are: 1. This utility model integrates the belt conveyor drive system (motor and reducer) into the inside of the roller by using an electric roller 41, completely eliminating the external drive system and saving a lot of space; at the same time, the telescopic drive part also adopts a compact gear and rack design, which makes the whole machine structure much more compact and lightweight than the traditional dual external motor solution.

[0051] 2. The telescopic function of this utility model adopts a rigid and precise gear 32 + rack 33 transmission, which eliminates the inherent defects of chain drive and ensures smooth, accurate and long-lasting telescopic movement. The belt conveyor function adopts a mature electric roller 41, reducing external transmission links and thus reducing the failure rate.

[0052] 3. This utility model achieves dynamic automatic tensioning of the conveyor belt by utilizing the movement of the telescopic frame 2, ensuring stable conveying throughout the entire stroke range.

[0053] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A telescopic belt conveyor, characterized in that, include: Main frame (1); The telescopic frame (2) can extend or retract relative to the main frame (1); The telescopic mechanism (3) is used to drive the telescopic frame (2) to reciprocate, including a motor (31) mounted on the main frame (1) and a gear and rack transmission assembly connected to the motor (31). The belt conveyor mechanism (4) includes an electric roller (41) and an annular conveyor belt, which is wrapped around the main frame (1) and the telescopic frame (2). The electric roller (41) is mounted on the main frame (1). The electric roller (41) integrates the conveyor motor inside its cylinder and serves as the sole drive wheel for driving the conveyor belt.

2. The telescopic belt conveyor according to claim 1, characterized in that, The gear and rack transmission assembly includes a gear (32) and a rack (33). The output shaft of the motor (31) is fixedly connected to at least one gear (32) via a transmission shaft. The telescopic frame (2) and the rack (33) are fixed together, and the gear (32) and the rack (33) mesh and transmit power.

3. A telescopic belt conveyor according to claim 1, characterized in that, The motor (31) and the electric roller (41) are both located at the bottom of the main frame (1).

4. A telescopic belt conveyor according to claim 1, characterized in that, The wrap angle of the conveyor belt on the electric roller (41) is greater than 170 degrees.

5. A telescopic belt conveyor according to claim 1, characterized in that, It also includes a driven roller group (42), which includes several driven rollers, some of which are mounted on the main frame (1) and others are mounted on the telescopic frame (2). The driven roller group (42) is used to dynamically tension the conveyor belt when the telescopic frame (2) moves.

6. A telescopic belt conveyor according to claim 5, characterized in that, The driven roller group (42) includes roller one (421), roller two (422) and roller three (423). Roller one (421) is rotatably connected to the bottom of the main frame (1); roller two (422) and roller three (423) are rotatably connected to the front and rear ends of the bottom of the telescopic frame (2), respectively. The conveyor belt is sleeved on the electric roller (41), roller one (421), roller two (422) and roller three (423).

7. A telescopic belt conveyor according to claim 6, characterized in that, The roller surfaces of the electric rollers (41), roller one (421), roller two (422) and roller three (423) are tapered.

8. A telescopic belt conveyor according to claim 1, characterized in that, A guide rail assembly is provided between the main frame (1) and the telescopic frame (2). The guide rail assembly includes a first guide rail (11) fixed to the main frame (1) and a second guide rail (21) fixed to the telescopic frame (2). The first guide rail (11) and the second guide rail (21) are in sliding contact.

9. A telescopic belt conveyor according to claim 8, characterized in that, The guide rail one (11) and guide rail two (21) are made of steel, and the contact surfaces of the two are covered with a wear-resistant layer.

10. A telescopic belt conveyor according to claim 1, characterized in that, It also includes a limiting mechanism (5) for limiting the travel of the telescopic frame (2).

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