Hydraulically-driven detachable oil cylinder type track guiding and tensioning device

Abstract

The hydraulic-driven detachable oil cylinder type track guiding and tensioning device comprises a mounting base and a tensioning oil cylinder, the mounting base comprises a shaft mounting part and a tensioning oil cylinder mounting part, the shaft mounting part is transversely arranged, and the tensioning oil cylinder mounting part is vertically arranged in the middle of the shaft mounting part and provided with a mounting hole; a tensioning oil cylinder is detachably installed in the installation hole and comprises a cylinder body inner barrel, a sealing seat is fixedly installed on an upper opening of the cylinder body inner barrel, a piston rod is arranged in the cylinder body inner barrel and the sealing seat, the upper portion of an inner hole of the sealing seat extends towards the center to form a sealing table, and a sealing piece is arranged between the sealing table and the piston rod. The sealing base forms a cavity for containing hydraulic oil below the sealing table, an oil inlet hole is vertically formed in the sealing base, an oil inlet channel is formed in the lower portion of the oil inlet hole and communicated with the cavity, and an oil inlet channel is formed in the upper portion of the oil inlet hole and connected with an oil inlet pipe arranged on the outer side of the sealing base. The device is stable and controllable in tensioning force and rapid in response, the tensioning oil cylinder can be rapidly replaced, and maintenance time is saved.

Description

Technical Field

[0001] This invention relates to the field of coal mining machinery technology, specifically to a hydraulically driven, detachable cylinder-type track guide tensioning device. Background Technology

[0002] Coal mining, as one of the main energy sources, still relies heavily on tunneling machines. During operation, tunneling machines frequently experience track chain loosening, causing power loss in the traveling mechanism. In severe cases, this can lead to the track chain detaching from the entire traveling mechanism. Therefore, it is necessary to install a guide tensioning device on the traveling mechanism to ensure that the track chain is always in contact with the track frame and remains within the normal suspension range.

[0003] Currently, the guide tensioning device of the tunneling machine's traveling mechanism uses grease tensioning. Furthermore, replacing the cylinder seal of the guide tensioning device requires disassembling the entire device, resulting in low tensioning efficiency and inconvenient maintenance. When operating underground in coal mines, the tunneling machine's traveling mechanism is often in a muddy or coal slurry environment. Combined with the demands of overall machine production, this poses a severe challenge to work efficiency and the ability to efficiently replace parts. Summary of the Invention

[0004] To address the technical problems of low tensioning efficiency and inconvenient cylinder seal replacement in current track guide tensioning devices for tunneling machines, which affect the production capacity of tunneling machines, this invention provides a hydraulically driven, detachable cylinder-type track guide tensioning device.

[0005] The technical solution adopted in this invention is a hydraulically driven detachable cylinder-type track guide tensioning device, including a mounting base and a tensioning cylinder. The mounting base consists of a T-shaped shaft mounting part and a tensioning cylinder mounting part. The shaft mounting part is arranged horizontally and has a through shaft hole. The tensioning cylinder mounting part is arranged vertically in the middle of the shaft mounting part and has a mounting hole. The tensioning cylinder is detachably installed in the mounting hole. The tensioning cylinder includes a cylinder inner cylinder. A sealing seat is fixedly installed at the upper opening of the cylinder inner cylinder. A piston rod is arranged inside the cylinder inner cylinder and the sealing seat. The upper part of the inner hole of the sealing seat extends towards the center to form a sealing platform. A sealing element is arranged between the sealing platform and the piston rod. The sealing seat forms a chamber for receiving hydraulic oil below the sealing platform. The sealing seat has a vertical oil inlet hole. An oil inlet passage is provided at the lower part of the oil inlet hole to connect to the chamber. An oil inlet passage is provided at the upper part of the oil inlet hole to connect to an oil inlet pipe arranged on the outside of the sealing seat. The oil inlet pipe extends to the outside of the tensioning cylinder mounting part.

[0006] Furthermore, a T-shaped notch is provided at the upper end of the tensioning cylinder mounting part, and the oil inlet pipe is set in the lower middle opening of the T-shaped notch. A baffle is provided at the upper opening of the T-shaped notch, and the baffle is fixed to the tensioning cylinder mounting part with fastening screws.

[0007] Furthermore, the inner cylinder and the sealing seat are connected by vertically arranged connecting screws evenly distributed around the upper end of the sealing seat, and a second O-ring is installed on the end face between the two. A guide wear-resistant ring, a left Conrem seal and a second dustproof ring are installed between the sealing platform and the piston rod from bottom to top.

[0008] Furthermore, the shaft hole has shoulders on both sides, bearings are installed in the shoulders, the shaft is connected to the bearings in the shaft hole, and guide wheels are installed at both ends of the shaft.

[0009] Furthermore, a first O-ring is installed between the shaft and the guide wheel, a floating oil seal is installed between the guide wheel and the bearing, and an oil injection hole is opened at the end of the guide wheel, which is sealed by a screw plug and a washer.

[0010] Furthermore, a nut is installed at the outermost end of the shaft to fix the guide wheel on the shaft, and a pin hole is opened between the shaft and the nut, and a cotter pin is installed.

[0011] Furthermore, an extension block protrudes outward from the outer periphery of the upper end of the sealing seat, and a set screw hole is vertically provided on the extension block. The end side of the tensioning cylinder mounting part is provided with a mounting groove corresponding to the extension block. The tensioning cylinder can be pushed out by screwing the set screw hole with a set screw bolt.

[0012] Furthermore, four sets of extension blocks are arranged at equal angles to the mounting slots.

[0013] Furthermore, a first dustproof ring is provided between the outer ring of the sealing seat and the mounting hole.

[0014] Furthermore, the tensioning cylinder is powered by the hydraulic system of the tunneling machine.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention abandons the traditional grease tensioning method and adopts a hydraulically driven tensioning structure, which can directly realize the automatic tensioning and relaxation adjustment of the guide wheel through the hydraulic system. The tension force is stable and controllable, and the response is rapid. It avoids the problems of cumbersome manual grease application and uneven tensioning, and significantly improves the reliability and tensioning efficiency of the tunneling machine's walking system.

[0016] 2. This invention features a detachable tensioning cylinder in the tensioning cylinder mounting section, enabling quick assembly and disassembly via a set screw structure. When replacing the seal, it is not necessary to disassemble the entire guide tensioning device; only the cylinder needs to be removed for maintenance, significantly shortening maintenance time, reducing labor intensity, and improving downhole maintenance efficiency. The outer periphery of the sealing seat is equipped with four sets of equally angled extension blocks and set screw holes. When the tensioning cylinder needs to be disassembled, it can be smoothly ejected by rotating the set screw bolt, avoiding damage to components caused by knocking or prying, thus improving assembly and disassembly safety and operational convenience.

[0017] 3. In this invention, the tensioning cylinder is embedded within the tensioning cylinder mounting section of the guide device, making the overall structure more compact and reducing exposed parts. This facilitates installation in the confined spaces of underground coal mines and avoids the vulnerability of externally mounted cylinders to coal dust and mud contamination, thus extending the device's service life. The tensioning cylinder sealing system employs a multi-stage sealing structure (guide ring + Conrem seal + dustproof ring), effectively preventing impurities such as coal slurry and water vapor from entering the cylinder cavity. This ensures the cleanliness and stable sealing performance of the hydraulic system, extending the service life of the cylinder and the entire machine, and adapting to the complex environments of high humidity and high dust levels in underground coal mines. The guide wheel bearing utilizes a double-seal design (floating oil seal + O-ring) to effectively prevent the intrusion of mud and coal dust. Attached Figure Description

[0018] Figure 1 This is a half-sectional front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a front sectional view of the mounting base of the present invention; Figure 5 This is a top view of the mounting base of the present invention; Figure 6 This is a front sectional view of the tensioning cylinder of the present invention; Figure 7 This is a top view of the tensioning cylinder of the present invention.

[0019] In the diagram: 1. Tensioning cylinder; 2. First dustproof ring; 3. Mounting seat; 4. Guide wheel; 5. Floating oil seal; 6. Plug; 7. Washer; 8. Bearing; 9. Nut; 10. Shaft; 11. First O-ring; 12. Fastening screw; 13. Baffle; 14. Cotter pin; 101. Cylinder body; 102. Second O-ring; 103. Sealing seat; 104. Guide wear ring; 105. Connecting screw; 106. Left Conrem seal; 107. Second dustproof ring; 108. Piston rod. Detailed Implementation

[0020] To better understand the purpose, structure, and function of the present invention, a hydraulically driven detachable cylinder-type track guide tensioning device of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] like Figures 1-5As shown, a hydraulically driven, detachable cylinder-type track guide tensioning device includes a mounting base 3 and a tensioning cylinder 1. The mounting base 3 consists of a T-shaped shaft mounting part and a tensioning cylinder mounting part. The shaft mounting part is horizontally arranged and has a through shaft hole. The tensioning cylinder mounting part is vertically arranged in the middle of the shaft mounting part and has a circular mounting hole. The tensioning cylinder 1 is detachably installed in the mounting hole. Rectangular grooves are opened on the upper and lower end faces of the mounting base 3 for mounting and fixing the entire guide tensioning device on the track frame.

[0022] The shaft hole has shoulders on both sides, and bearings 8 are installed in the shoulders. A shaft 10 is installed in the shaft hole and connects with the bearings 8. Guide wheels 4 are installed at both ends of the shaft 10, and the guide wheels 4 roll through the shaft 10 and the two bearings 8. A first O-ring 11 is installed between the shaft 10 and the guide wheels 4. A floating oil seal 5 is installed between the guide wheels 4 and the bearings 8. An oil injection hole is opened at the end of the guide wheel 4, which is sealed by a screw plug 6 and a washer 7. A nut 9 is installed at the outermost end of the shaft 10 to fix the guide wheel 4 on the shaft 10. A pin hole is opened between the shaft 10 and the nut 9, and a cotter pin 14 is installed to further prevent the nut 9 from loosening and causing the guide wheel 4 to fall off.

[0023] A first dustproof ring 2 is installed between the tensioning cylinder 1 and the mounting hole. The first dustproof ring 2 is held in place between the tensioning cylinder 1 and the mounting hole by the force between them, effectively preventing impurities from entering the mounting hole. Figure 6 and Figure 7 As shown, the tensioning cylinder 1 includes an inner cylinder cylinder 101, a second O-ring 102, a sealing seat 103, a guide wear-resistant ring 104, a connecting screw 105, a left Conrem seal 106, a second dust seal 107, and a piston rod 108. The inner cylinder cylinder 101 and the sealing seat 103 are connected by the connecting screw 105 to form the outer cylinder of the tensioning cylinder, and the second O-ring 102 is installed on the end face between the inner cylinder cylinder 101 and the sealing seat 103. The piston rod 108 is disposed inside the outer cylinder of the tensioning cylinder.

[0024] Four outwardly protruding extension blocks are provided at equal angles on the outer periphery of the upper end of the sealing seat 103. Each extension block has a vertically positioned set screw hole. A mounting groove is provided on the end side of the tensioning cylinder mounting part corresponding to the extension blocks, providing a set screw support surface for the tensioning cylinder 1. By connecting a set screw bolt through the set screw hole, the tensioning cylinder 1 inside the guide tensioning device can be quickly disassembled.

[0025] The upper part of the inner hole of the sealing seat 103 extends towards the center to form a sealing platform. A guide wear-resistant ring 104, a left Conrem seal 106, and a second dust seal 107 are sequentially installed between the sealing platform and the piston rod 108 from bottom to top, ensuring that the hydraulic oil in the tension cylinder 1 is in a sealed state. Below the sealing platform, the sealing seat 103 forms a chamber to accommodate hydraulic oil. An oil inlet pipe is welded to the side of the sealing seat 103 near its upper end. A vertical oil inlet hole is provided on the sealing seat 103. An oil inlet passage is provided below the oil inlet hole to connect to the chamber, and an oil inlet passage is provided above the oil inlet hole to connect to the oil inlet pipe located on the outside of the sealing seat 103.

[0026] The oil inlet pipe extends to the outside of the tension cylinder mounting part. A T-shaped notch is provided at the upper end of the tension cylinder mounting part, and the oil inlet pipe is set in the lower middle opening of the T-shaped notch. A baffle 13 is provided at the upper opening of the T-shaped notch. The baffle 13 is fixed to the tension cylinder mounting part with fastening screws 12 to prevent the tension cylinder 1 from slipping off during transportation.

[0027] When the track guide tensioning device operates in a non-operating condition, it supports the tunneling machine's shovel and rear support, and the traveling mechanism is in an unloaded state. The hydraulic system of the tunneling machine provides the hydraulic power source, injecting hydraulic oil into the oil inlet of the tensioning cylinder 1 of the guide tensioning device. The hydraulic oil passes through the oil inlet passage in the sealing seat 103 and is injected into the chamber between the sealing seat 103 and the piston rod 108. This chamber is divided into upper and lower chambers. Hydraulic oil enters the upper chamber first, followed by the lower chamber in the initial state. Pre-pressure is provided, and then hydraulic oil continuously enters the lower chamber through the U-shaped groove. At this time, the bottom of the piston rod 108 is pushed outward under the continuous pressure of the hydraulic oil. During the extension of the piston rod 108, the first O-ring 11 between the sealing seat 103 and the inner cylinder 101, the second dustproof ring 107 between the sealing seat 103 and the piston rod 108, the left Conrem seal 106, and the guide wear-resistant ring 104 work together to seal the hydraulic oil in the tensioning cylinder 1 formed by the sealing seat 103, the inner cylinder 101, and the piston rod 108. After the guide tensioning device provides the required tension force to the track chain, the tensioning cylinder 1 acts between the track frame of the traveling mechanism and the mounting seat 3 of the guide tensioning device, and is in a static tension state. The external hydraulic system automatically closes the hydraulic oil supply line at this time, and the hydraulic tensioning operation of the tunneling machine's traveling mechanism track is completed.

[0028] During later maintenance, the set screw is screwed into the set screw hole. Under the reaction force of the mounting seat 3, the set screw pushes the tension cylinder 1 out of the mounting hole, realizing the quick replacement of the tension cylinder 1, thereby saving maintenance time and improving the production capacity of the tunneling machine.

[0029] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A hydraulically driven detachable cylinder track guide tensioning device, characterized in that, The mounting seat (3) is composed of a T-shaped shaft mounting portion and a tensioning oil cylinder mounting portion, the shaft mounting portion is horizontally arranged and provided with a shaft hole, the tensioning oil cylinder mounting portion is vertically arranged at the middle of the shaft mounting portion and provided with a mounting hole, and the tensioning oil cylinder (1) is detachably mounted in the mounting hole.

2. The hydraulically driven demountable cylinder track guide tensioning device of claim 1, wherein, The tensioning oil cylinder (1) comprises a cylinder inner tube (101), a sealing seat (103) is fixedly mounted on the upper opening of the cylinder inner tube (101), a piston rod (108) is arranged in the cylinder inner tube (101) and the sealing seat (103), the inner hole of the sealing seat (103) is upwardly extended to form a sealing platform, a sealing element is arranged between the sealing platform and the piston rod (108), a chamber for containing hydraulic oil is formed below the sealing platform, an oil inlet hole is vertically arranged on the sealing seat (103), an oil inlet oil channel is arranged in the lower part of the oil inlet hole and connected with the chamber, and an oil inlet oil pipe is arranged on the upper part of the oil inlet hole and connected with the outer side of the sealing seat (103), and the oil inlet oil pipe extends to the outer side of the tensioning oil cylinder mounting portion.

3. The hydraulically driven demountable cylinder track guide tensioning device of claim 1, wherein, A T-shaped notch is formed at the upper end of the tensioning oil cylinder mounting portion, the oil inlet oil pipe is arranged in the lower middle opening of the T-shaped notch, and a baffle (13) is arranged in the upper opening of the T-shaped notch and fixed on the tensioning oil cylinder mounting portion by a fastening screw (12).

4. The hydraulically driven demountable cylinder track guide tensioning device of claim 1, wherein, The cylinder inner tube (101) and the sealing seat (103) are connected by a connecting screw (105) which is vertically arranged on the upper end of the sealing seat (103) and uniformly distributed around the sealing seat (103), and a second O-shaped ring (102) is arranged on the end face between the cylinder inner tube (101) and the sealing seat (103), and a guide wear-resistant ring (104), a left Konle seal (106) and a second dustproof ring (107) are sequentially arranged from bottom to top between the sealing platform and the piston rod (108).

5. The hydraulically driven demountable cylinder track guide tensioning device of claim 4, wherein, Shoulder holes are arranged on both sides of the shaft hole, bearings (8) are arranged in the shoulder holes, a shaft (10) is arranged in the shaft hole and connected with the bearings (8), and guide wheels (4) are arranged on both ends of the shaft (10).

6. The hydraulically driven demountable cylinder track guide tensioning device of claim 5, wherein, A first O-shaped ring (11) is arranged between the shaft (10) and the guide wheels (4), a floating oil seal (5) is arranged between the guide wheels (4) and the bearings (8), and an oil injection hole is formed in the end of the guide wheel (4) and closed by a screw plug (6) matched with a gasket (7).

7. The hydraulically driven demountable cylinder track guide tensioning device of claim 1, wherein, A nut (9) is arranged on the outermost end of the shaft (10) to fix the guide wheels (13) on the shaft (10), a pin hole is formed between the shaft (10) and the nut (9), and a split pin (14) is arranged in the pin hole.

8. The hydraulically driven demountable cylinder track guide tensioning device of claim 7, wherein, An extension block is protruded outwardly from the outer periphery of the upper end of the sealing seat (103), a top screw hole is vertically arranged on the extension block, an installation groove is arranged on the end side of the tensioning oil cylinder mounting portion corresponding to the extension block, and the tensioning oil cylinder (1) can be pushed out by screwing the top screw hole with a top screw bolt.

9. The hydraulically driven demountable cylinder track guide tensioning device of claim 1, wherein, Four groups of the extension blocks and the installation grooves are arranged at equal angles.

10. The hydraulically driven demountable cylinder track guide tensioning device according to any one of claims 1 to 9, characterized in that A first dustproof ring (2) is arranged between the outer circle of the sealing seat (103) and the mounting hole. The tensioning oil cylinder (1) is provided with a hydraulic power source by a hydraulic system of a tunneling machine.

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