Roller chain tensioning mechanism

Abstract

The utility model relates to a roller chain tensioning mechanism which comprises a tensioning frame, a hydraulic cylinder and a tensioning chain wheel, the tensioning chain wheel is arranged on the tensioning frame in a sliding mode, one end of the hydraulic cylinder is connected with the tensioning chain wheel, the other end of the hydraulic cylinder is fixed to the tensioning frame through a spring, and the hydraulic cylinder comprises a hydraulic cylinder body and a piston rod. The hydraulic cylinder body is arranged on one end face of the tensioning frame in a penetrating mode, the hydraulic cylinder body is sleeved with the spring, one end of the spring abuts against an outer flanging of the hydraulic cylinder body, the other end of the spring abuts against the end face of the tensioning frame, the piston rod is inserted into the hydraulic cylinder body, and a chain wheel frame is fixed to one end of the piston rod. According to the chain tensioning device, only lubricating oil needs to be injected into the hydraulic cylinder in the tensioning device, the piston rod can stretch out, the chain is tensioned easily, and meanwhile the tensioning device is provided with the tensioning spring with pretightening force to play a role in buffering and clinging.

Description

Technical Field

[0001] This utility model relates to the field of down-the-hole drill rig structure technology, and in particular to a roller chain tensioning mechanism. Background Technology

[0002] Down-the-hole drills are commonly used equipment in mining engineering. Their propulsion system includes guide rails and guide plates mounted on the guide rails. The power mechanism is mounted on the guide plate, and the power output shaft of the power mechanism is coaxially connected to the drill rod. When the power output shaft of the power mechanism rotates, it drives the drill rod to perform drilling actions. The guide plate moves along the guide rail to complete the propulsion and retraction actions.

[0003] Drilling rig propulsion mechanisms mostly use chains to drive sliding plate assemblies in a reciprocating motion to complete the drilling rig's feeding operation. After a period of use, these chains will loosen and need tensioning. Most existing chain drive systems use adjusting screws to adjust the chain tension. This screw adjustment method has several drawbacks: firstly, the adjusting screw will rotate under tension, requiring anti-rotation measures on the adjusting nut; secondly, the adjusting screw's adjustment stroke is relatively short, resulting in incomplete adjustment; and thirdly, this structure is inconvenient to operate during adjustment. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a roller chain tensioning mechanism, which makes the sprocket tensioning operation convenient and extends the overall service life.

[0005] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0006] A roller chain tensioning mechanism includes a tensioning frame, a hydraulic cylinder, and a tensioning sprocket. The tensioning sprocket is slidably mounted on the tensioning frame. One end of the hydraulic cylinder is connected to the tensioning sprocket, and the other end is fixed to the tensioning frame by a spring. The hydraulic cylinder includes a hydraulic cylinder body and a piston rod. The hydraulic cylinder body passes through one end face of the tensioning frame. The spring is sleeved on the hydraulic cylinder body, with one end abutting against the outer flange of the hydraulic cylinder body and the other end abutting against the end face of the tensioning frame. The piston rod is inserted into the hydraulic cylinder body, and a sprocket frame is fixed to one end of the piston rod.

[0007] As a preferred embodiment, the tensioning sprocket is tightly fitted onto the bearing, and the bearing has retaining rings on both sides of the tensioning sprocket. The inner ring of the bearing is tightly fitted onto the pin, and the two ends of the pin are inserted and fixed onto the sprocket frame.

[0008] As a preferred embodiment, one end of the pin is provided with a blind hole, an oil injection bolt is provided in the blind hole, and a spring washer is provided between the oil injection bolt and the blind hole. A straight oil cup is also provided on the outside of the oil injection bolt.

[0009] As a preferred embodiment, a sliding groove is provided on the side wall of one end of the tensioning frame, and the pin extends into the sliding groove.

[0010] As a preferred embodiment, one end of the hydraulic cylinder is connected to a filling conduit via a connector, and the filling conduit is connected to an oil cup via a tensioning filling seat.

[0011] As a preferred embodiment, the sprocket frame is U-shaped as a whole, and an anti-chain slippage baffle is fixed on the upper surface of the sprocket frame.

[0012] As a preferred embodiment, the inner wall of the opening of the hydraulic cylinder is provided with multiple sealing rings, and a mounting seat is provided between the spring and the end face of the tensioning frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention only requires injecting lubricating oil into the hydraulic cylinder of the tensioning device, which extends the piston rod and easily tensions the chain. Simultaneously, the tensioning device is equipped with a pre-tensioned spring for cushioning and sealing. During drilling, the propulsion motor rotates forward, pulling the slide plate assembly forward via the propulsion sprocket, roller chain, and tensioning sprocket. Due to the pre-tensioned spring, this mechanism absorbs the alternating vibration load transmitted from the impactor along the drill pipe, thus protecting the propulsion motor and the entire propulsion beam system. Attached Figure Description

[0015] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0016] Figure 1 This is a schematic diagram of the overall structure of the tensioning mechanism of this utility model;

[0017] Figure 2 This is an exploded structural diagram of the tensioning mechanism of this utility model;

[0018] Figure 3 This is a schematic diagram of the tensioning component of this utility model;

[0019] Figure 4 This is a cross-sectional structural diagram of the tensioning component of this utility model.

[0020] The attached figures are labeled as follows: 21, tensioning frame; 221, hydraulic cylinder body; 222, piston rod; 2221, sealing ring; 223, sprocket frame; 224, spring; 225, mounting base; 23, tensioning sprocket; 231, bearing; 232, retaining ring; 233, spacer ring; 24, pin; 241, spring washer; 242, oil injection bolt; 243, straight-through oil cup; 25, anti-chain baffle; 26, connector; 27, oil filling pipe; 28, tensioning oil filling seat; 29, oil cup. Detailed Implementation

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] like Figures 1 to 4 As shown, a roller chain tensioning mechanism includes a tensioning frame 21, a hydraulic cylinder, and a tensioning sprocket 23. The tensioning sprocket 23 is slidably mounted on the tensioning frame 21. One end of the hydraulic cylinder is connected to the tensioning sprocket 23, and the other end is fixed to the tensioning frame 21 by a spring 224.

[0029] The hydraulic cylinder includes a hydraulic cylinder body 221 and a piston rod 222. The hydraulic cylinder body 221 passes through one end face of the tensioning frame 21. The spring 224 is sleeved on the outside of the hydraulic cylinder body 221, with one end abutting against the outer flange of the hydraulic cylinder body 221 and the other end abutting against the end face of the tensioning frame 21. A mounting seat 225 is also provided between the spring 224 and the end face of the tensioning frame 21. The piston rod 222 is inserted into the hydraulic cylinder body 221. Multiple sealing rings 2221 are also provided on the inner side wall of the opening of the hydraulic cylinder body 221. The sealing rings 2221 abut against the piston rod to prevent hydraulic oil leakage.

[0030] One end of the piston rod 222 is fixed with a sprocket frame 223, which is U-shaped and has an anti-chain slippage baffle 25 fixed on its upper surface. One end of the hydraulic cylinder body 221 is connected to an oil filling conduit 27 via a connector 26, and the oil filling conduit 27 is connected to an oil cup 29 via a tensioning oil filling seat 28.

[0031] The tensioning sprocket 23 is tightly fitted onto the bearing 231, and the bearing 231 has retaining rings 232 on both sides of the tensioning sprocket 23. The inner ring of the bearing 231 is tightly fitted onto the pin 24, and the two ends of the pin 24 are inserted and fixed onto the sprocket frame 223. The pin 24 is also provided with spacer rings 233.

[0032] The bearing is a double-row cylindrical roller bearing. One end of the pin 24 has a blind hole, and an oil injection bolt 242 is installed in the blind hole. A spring washer 241 is placed between the oil injection bolt 242 and the blind hole. A straight-through oil cup 243 is also provided on the outside of the oil injection bolt 242. The side wall of the pin also has a through hole communicating with the blind hole. The oil injection bolt 242 can introduce lubricating oil into the double-row cylindrical roller bearing, increasing the lubrication of the inner and outer rings of the bearing and ensuring the stable operation of the sprocket.

[0033] The tensioning frame 21 has a groove on one side wall, and the pin 24 extends into the groove. The tensioning frame 21 provides support for the sprocket and the pin, improving the stability of the sprocket during forward and backward movement and extending the service life of the tensioning mechanism.

[0034] After all components of the propulsion beam are assembled, this invention only requires adding grease to the grease cup using a grease gun. The hydraulic cylinder in the tensioning device extends, and the chain is easily tensioned. Simultaneously, the tensioning device is equipped with a pre-tensioned spring for cushioning and sealing. Furthermore, the grease cup can be positioned conveniently for grease application via the grease lubrication conduit 27.

[0035] During drilling, the propulsion motor rotates forward, pulling the slide assembly forward via the propulsion sprocket, roller chain, and tension sprocket. Due to the pre-tensioned tension spring, this mechanism absorbs the alternating vibration load transmitted from the impactor along the drill pipe, thus protecting the propulsion motor and the entire propulsion beam system. This invention features reliable roller chain tensioning, convenient operation, and effectively absorbs the alternating vibration load transmitted from the impactor along the drill pipe, extending the drilling rig's lifespan.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A roller chain tensioning mechanism, characterized in that: The device includes a tensioning frame (21), a hydraulic cylinder, and a tensioning sprocket (23). The tensioning sprocket (23) is slidably mounted on the tensioning frame (21). One end of the hydraulic cylinder is connected to the tensioning sprocket (23), and the other end is fixed to the tensioning frame (21) by a spring (224). The hydraulic cylinder includes a hydraulic cylinder body (221) and a piston rod (222). The hydraulic cylinder body (221) passes through one end face of the tensioning frame (21). The spring (224) is sleeved outside the hydraulic cylinder body (221), with one end abutting against the outer flange of the hydraulic cylinder body (221) and the other end abutting against the end face of the tensioning frame (21). The piston rod (222) is inserted into the hydraulic cylinder body (221), and one end of the piston rod (222) is fixed with a sprocket frame (223).

2. The roller chain tensioning mechanism according to claim 1, characterized in that, The tensioning sprocket (23) is tightly fitted onto the bearing (231), and the bearing (231) is provided with retaining rings (232) on both sides of the tensioning sprocket (23). The inner ring of the bearing (231) is tightly fitted onto the pin (24), and the two ends of the pin (24) are inserted and fixed onto the sprocket frame (223).

3. The roller chain tensioning mechanism according to claim 2, characterized in that, One end of the pin (24) is provided with a blind hole, and an oil injection bolt (242) is provided in the blind hole. A spring washer (241) is provided between the oil injection bolt (242) and the blind hole. A straight oil cup (243) is also provided on the outside of the oil injection bolt (242).

4. The roller chain tensioning mechanism according to claim 2, characterized in that, The tensioning frame (21) has a sliding groove on one side wall, and the pin (24) extends into the sliding groove.

5. A roller chain tensioning mechanism according to claim 1, characterized in that, One end of the hydraulic cylinder body (221) is connected to a filling conduit (27) via a connector (26), and the filling conduit (27) is connected to an oil cup (29) via a tensioning filling seat (28).

6. The roller chain tensioning mechanism according to claim 1, characterized in that, The sprocket frame (223) is U-shaped, and an anti-chain derailment baffle (25) is fixed on the upper surface of the sprocket frame (223).

7. The roller chain tensioning mechanism according to claim 1, characterized in that, Multiple sealing rings (2221) are provided on the inner side wall of the opening of the hydraulic cylinder body (221), and a mounting seat (225) is provided between the spring (224) and the end face of the tensioner (21).

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