A jack device with replaceable jaws

Abstract

The utility model discloses a jack device convenient to replace clamping piece, including lengthening rod, the lengthening rod bottom is connected with lower clamping top, and the part of lengthening rod top is set up as external thread through the compression plate, is provided with upper nut, lower nut respectively on the lengthening rod external thread surface of the upper and lower sides of compression plate, and make the upper nut, lower nut rotate the compression or loosen the compression plate. The utility model discloses through increasing a plurality of lengthening rods and forming the replacement clamping piece structure, only need to rotate slowly the lower nut, and the compression plate of clamping piece can move upwards along with the lower nut until reaches the space of replacement clamping piece. Without the help of other hoisting, fixing tool, especially suitable for the occasion of the large appearance, heavy weight of clamping piece compression plate.

Description

Technical Field

[0001] This utility model relates to the technical field of horizontal traction of structures, lifting of heavy objects, and lowering, specifically a jack device that facilitates the replacement of clamps. Background Technology

[0002] Previous lifting jacks had smaller tonnage and relatively light lower clamping plates, making them easy to move and replace. However, current lifting jacks have larger tonnage and are installed inside the support legs. The lower clamping plates weigh nearly 200 kg each and have an outer diameter of almost 1 meter. Without disassembling the jack structure, loosening the clamping plates and lifting the jack a certain distance is difficult and poses a safety risk to the operator. (See...) Figure 1 .

[0003] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] In view of the above-mentioned defects, the purpose of this utility model is to provide a jack device that facilitates the replacement of clamping plates, which is used in conjunction with the clamping plate clamping plate.

[0005] The technical solution of this utility model is as follows:

[0006] A jack device for easy clamp replacement includes a lower clamping top disposed within a support leg. A working clamp is disposed on the top surface of the lower clamping top. The lower clamping top is connected to a pressure plate via a top pressure rod. The pressure plate can press the working clamp by moving with the top pressure rod. The device also includes an extension rod. The bottom of the extension rod is connected to the lower clamping top. The portion of the extension rod that passes through the pressure plate is configured with an external thread. An upper nut and a lower nut are respectively disposed on the external thread surfaces of the extension rod on the upper and lower sides of the pressure plate, and the upper nut and lower nut can be rotated to press or loosen the pressure plate.

[0007] Specifically, the extension rod is also provided with an outer cylindrical boss, and the upper and lower stepped surfaces of the outer cylindrical boss are respectively connected to the lower nut and the lower clamping top limit.

[0008] Specifically, the upper nut and lower nut are pressed against the clamping plate by flat washers.

[0009] Specifically, the bottom of the extension rod is threadedly connected to the lower clamping top.

[0010] Specifically, the top of the extension rod is provided with a milled flat section.

[0011] Specifically, there are 2-6 extension rods, evenly distributed on the outer ring of the lower clamping top.

[0012] The beneficial effects of this utility model are:

[0013] This utility model provides a jack device for easy clamp replacement. By adding several extension rods to the existing structure to form a clamp replacement mechanism, the clamp clamping plate can be moved upwards by slowly loosening the lower thick nut until it reaches the space where the clamp can be replaced. After replacing the clamp, the lower nut is slowly tightened to the stepped end face of the extension rod, and the clamp clamping plate also moves upwards with the lower thick nut until it reaches the designed distance. Finally, the upper hexagonal nut is tightened. No other lifting or fixing tools are required, making it particularly suitable for situations where the clamp clamping plate is large and heavy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a jack device in the prior art.

[0015] Figure 2 This is a schematic diagram of a jack device for easy replacement of clamps according to the present invention.

[0016] Figure 3 This is a schematic diagram of the extension rod of this utility model.

[0017] In the diagram: 1-support foot, 2-lower clamping top, 3-top pressure rod, 4-pressure plate, 5-working clamping piece, 6-extension rod, 7-upper nut, 8-lower nut, 9-outer cylindrical boss, 10-flat washer, 11-milled flat part. Detailed Implementation

[0018] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with embodiments and accompanying drawings. In the description of the embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this embodiment and simplifying the description, and are not intended to 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.

[0019] The present invention discloses a jack device structure that facilitates the replacement of clamps, as shown in the following figure. Figure 2-3 As shown, the jack device for changing the clamping plate mainly consists of a support foot 1, a lower clamping top 2, a pressing rod 3, a clamping plate 4, a working clamping plate 5, an extension rod 6, an upper nut 7, and a lower nut 8.

[0020] The lower clamping top 2 is fixed inside the support leg 1. The pressure plate 4 located above the lower clamping top 2 is connected to the lower clamping top 2 through the top pressure rod 3. The working clamp 5 is set at the top surface of the lower clamping top 2. The pressure plate 4 can press the working clamp 5 by moving with the top pressure rod 3.

[0021] An extension rod 6 is provided between the lower clamping top 2 and the pressure plate 4. The upper middle part of the extension rod 6 is fully threaded, and the lower half of the extension rod 6 is an outer cylindrical boss 9. The bottom of the extension rod 6 is threaded with a small diameter external thread and is threaded to the lower clamping top 2. The lower step of the outer cylindrical boss 9 contacts and limits the lower clamping top 2. The fully threaded end of the extension rod 6 passes through the pressure plate 4, and an upper nut 7 and a lower nut 8 are respectively provided on the external threaded surfaces of the extension rod 6 located on the upper and lower sides of the pressure plate 4. The lower nut 8 contacts and limits the contact between its bottom and the upper step of the outer cylindrical boss 9 by rotating. A flat washer 10 is provided at the contact point between the upper nut 7, the lower nut 8 and the pressure plate. The upper nut 7 and the lower nut 8 tighten or loosen the pressure plate 4 by rotating. The end of the extension rod 6 is milled flat 11 to facilitate tightening and loosening of the extension rod 6. Firstly, the thread design is long enough to allow the clamping plate 4 to reach its highest position as the lower nut 8 moves, maximizing the space for replacing the working clamp 5 and improving its replacement efficiency. Flat washers 10 are added to the upper part of the lower nut 8 and the lower part of the upper nut 7 to reduce damage to the surface of the clamping plate 4 when tightening or loosening the nuts, ensuring the surface quality of the clamping plate 4. In this embodiment, the lower nut 8 is a thick nut. This is because the wrench position is long enough to allow for a variety of tools for tightening and loosening the nut; and even when not tightened against the stepped surface of the extension rod, the thick nut provides sufficient force, ensuring structural safety.

[0022] In this embodiment, while ensuring that the top pressure rod 3 can withstand the clamping force, it is preferable to add four sets of extension rods 6 with replaceable clamping plates evenly distributed on the outer ring of the lower clamping top 2.

[0023] The working process of the lower clamping top is as follows: When the lower clamping top 2 extends, the top-loosening structure inside the clamping top opens the clamping plate 5, and the pressing plate 4 follows the top-loosening structure to loosen the clamping plate 5. When the lower clamping top 2 retracts, the top-loosening structure inside the clamping top moves away from the clamping plate 5, and the pressing plate 4 follows the top-loosening structure to move downward and press the clamping plate 5.

[0024] When it is necessary to replace the working clamp 5, first loosen the upper nut at the top of the clamping plate 4, i.e., at the top pressure rod 3 and the extension rod 6, and remove it together with the flat washer 10 for temporary storage. Then, use a wrench to slowly loosen the lower nut 8 of the extension rod 6 at the symmetrical position for replacing the clamp. The clamping plate 4 will slowly move upward with the lower nut 8 until it is close to the top of the thread, which allows the operator to quickly replace the clamp. After replacing the working clamp 5, use a wrench to slowly tighten the lower nut 8. The clamping plate 4 will slowly move downward with the lower nut 8 until the lower nut 8 is tightened to the upper stepped surface of the outer cylindrical boss 9 of the extension rod 6. Finally, tighten the flat washer and nut at the top pressure rod 3 and the extension rod 6 to the end face of the clamping plate 4. The working clamp 5 can be replaced without the need for other large tools, which is convenient and quick.

[0025] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A jack device for easy replacement of clamping plates, comprising a lower clamping top (2) disposed within a support foot (1), a working clamping plate (5) disposed on the top surface of the lower clamping top (2), and a pressing plate (4) connected to the lower clamping top (2) via a pressing rod (3), the pressing plate (4) being able to press the working clamping plate (5) by moving with the pressing rod (3), characterized in that: It also includes an extension rod (6), the bottom of which is connected to the lower clamping top (2), and the part of the extension rod (6) that passes through the pressure plate (4) is set with an external thread. The extension rod (6) located on the upper and lower sides of the pressure plate (4) is provided with an upper nut (7) and a lower nut (8), respectively, so that the upper nut (7) and the lower nut (8) can be rotated to press or loosen the pressure plate (4).

2. The jack device for easy replacement of clamping plates according to claim 1, characterized in that: The extension rod (6) is also provided with an outer cylindrical boss (9), and the upper and lower stepped surfaces of the outer cylindrical boss (9) are respectively connected to the lower nut (8) and the lower clamping top (2) for positioning.

3. The jack device for easy replacement of clamping plates according to claim 1, characterized in that: The upper nut (7) and lower nut (8) press the clamping plate (4) together with the flat washer (10).

4. The jack device for easy replacement of clamps according to claim 1, characterized in that: The bottom of the extension rod (6) is threadedly connected to the lower clamping top (2).

5. A jack device for easy replacement of clamping plates according to claim 1, characterized in that: The top of the extension rod (6) is provided with a milled flat section (11).

6. A jack device for easy replacement of clamping plates according to any one of claims 1-5, characterized in that: The number of the extension rods (6) is 2-6, and they are evenly distributed on the outer ring of the lower clamping top (2).

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