An automatic tool anchor for easy installation

Abstract

The present invention relates to an automatic tool anchor that is easy to install, comprising a tool anchor, a jack, a clamping device and a clamping bolt. The tool anchor is installed in the piston of the jack, and the rear end of the tool anchor is provided with the clamping device for clamping the tool anchor. The rear end of the clamping device is fastened and connected with the rear end surface of the piston through the clamping bolt; the rear end of the clamping bolt is provided with a labor-saving rotating device for driving the clamping bolt to rotate. The present invention relates to an automatic tool anchor that is easy to install. Under the premise of not having to perform operations such as ejection and return, by providing a labor-saving rotating device on the clamping device, the clamping device can be loaded with little effort, thereby opening the clamp.

Description

Technical Field

[0001] The invention relates to a prestressed bridge tensioning test device, in particular to an automatic tool anchor which is easy to install. Background Art

[0002] Currently, the installation of an automatic tool anchor involves first lifting out, then tightening the clamping device, and then retracting the tool to open the tool clips and prepare for strand tensioning. Because the automatic tool anchor is equipped with a spring that pushes the clips forward, lifting out the tool anchor is typically required before installation, leaving sufficient space at the front of the jack for the automatic tool anchor to be installed. Once the clamping device is locked by the clamping cover, retracting the tool anchor allows the spring to be compressed, opening the clips and facilitating tensioning. Since tool anchors with different hole numbers often need to be changed during tensioning, the aforementioned process of hydraulic lifting, anchor removal, anchor installation, and hydraulic retraction is often repeated, which is time-consuming. Therefore, a clamping device was developed that eliminates the need for hydraulic lifting and retraction, instead directly compressing and releasing the spring to achieve automatic tool anchor replacement.

[0003] In such automatic tool anchors, to ensure the tool clips can reliably grip the stranded wire, the springs must be pre-compressed in addition to a certain stiffness requirement. The applied force of such a spring is between 10kg and 16kg. For a seven-hole clip, the total axial force on the entire automatic tool anchor is 70kg to 112kg. Pushing the automatic tool anchor manually is impossible, especially with a 22-hole tool anchor, which has a maximum axial force of 352kg. The locking and clamping mechanism primarily relies on circumferential rotation, which disregards axial force, only circumferential force—the axial force multiplied by the coefficient of friction. Overcoming circumferential force during rotation is also quite demanding. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic tool anchor which is easy to install and can save effort in installing the clamping device without the need for operations such as ejection and return, thereby opening the clamping piece.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an automatic tool anchor that is easy to install, comprising a tool anchor, a jack, a clamping device and a clamping bolt, wherein the tool anchor is installed in the piston of the jack, and the rear end of the tool anchor is equipped with the clamping device for clamping the tool anchor, and the rear end of the clamping device is fastened to the rear end surface of the piston through the clamping bolt; the rear end of the clamping bolt is equipped with a labor-saving rotating device for driving the clamping bolt to rotate.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, at least two clamping bolts are provided, and the rear end of the clamping device is fastened to the rear end surface of the piston through at least two of the clamping bolts.

[0008] Furthermore, all the clamping bolts are evenly distributed along the circumferential direction.

[0009] Furthermore, the clamping device includes a clamping device body located in the piston of the jack for clamping the tool anchor, and also includes a clamping cover connected to the clamping device body and located outside the rear end of the jack, the clamping cover is provided with a threaded through hole, the piston is provided with a threaded blind hole opposite to the threaded through hole, the thread on the clamping bolt matches the thread in the threaded through hole and the threaded blind hole, the clamping bolt is rotated from the threaded through hole into the threaded blind hole, so that the rear end of the clamping device is fastened together with the rear end face of the piston.

[0010] Furthermore, the labor-saving rotating device includes a handle, which is fixed to the rear end of the clamping bolt and forms a T-shaped structure with the clamping bolt.

[0011] Furthermore, the labor-saving rotation device includes a mounting seat, a nut gear, a moving gear, a bearing and an operating handle. The mounting seat is located outside the jack, the nut gear is fixed to the rear end of the clamping bolt and is located inside the mounting seat, the moving gear is installed in the mounting seat through the bearing and engages with the nut gear, and the operating handle is fixedly installed outside the mounting seat.

[0012] Furthermore, the mounting seat is movably fitted on the rear end of the cylinder body of the jack.

[0013] The beneficial effects of the present invention are as follows: the present invention provides an automatic tool anchor that is easy to install. Without the need for operations such as ejection and return, the clamping device can be installed with little effort to open the clamping piece by arranging a labor-saving rotating device on the clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of an automatic tool anchor that is easy to install according to the present invention;

[0015] Figure 2 Another structural schematic diagram of an automatic tool anchor that is easy to install according to the present invention;

[0016] Figure 3 Schematic diagram of calculation of hoop force;

[0017] Figure 4 This is a diagram of the labor-saving principle of the handle.

[0018] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0019] 1. Tool anchor, 2. Jack, 21. Piston, 22. Cylinder, 3. Clamping device, 31. Clamping device body, 32. Clamping cover, 4. Clamping bolt, 5. Handle, 6. Mounting seat, 7. Nut gear, 8. Moving gear, 9. Bearing, 10. Operating handle. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] like Figure 1 and Figure 2 As shown, an automatic tool anchor that is easy to install includes a tool anchor 1, a jack 2, a clamping device 3 and a clamping bolt 4. The tool anchor 1 is installed in the piston 21 of the jack 2. The rear end of the tool anchor 1 is equipped with the clamping device 3 for clamping the tool anchor 1. The rear end of the clamping device 3 is fastened to the rear end surface of the piston 21 through the clamping bolt 4; the rear end of the clamping bolt 4 is equipped with a labor-saving rotating device for driving the clamping bolt 4 to rotate.

[0022] In the present invention, at least two clamping bolts 4 are provided, and the rear end of the clamping device 3 is fastened to the rear end surface of the piston 21 via at least two clamping bolts 4. Specifically, all the clamping bolts 4 are evenly distributed along the circumferential direction.

[0023] In the present invention, the clamping device 3 includes a clamping device body 31 located in the piston 21 of the jack 2 for clamping the tool anchor 1, and also includes a clamping cover 32 connected to the clamping device body 31 and located outside the rear end of the jack 2. The clamping cover 32 is provided with a threaded through hole, and the piston 21 is provided with a threaded blind hole opposite to the threaded through hole. The thread on the clamping bolt 4 matches the threaded through hole and the thread in the threaded blind hole. The clamping bolt 4 rotates from the threaded through hole into the threaded blind hole, so that the rear end of the clamping device 3 is fastened together with the rear end face of the piston 21.

[0024] In the present invention, the labor-saving rotating device has the following two embodiments:

[0025] Example 1: Figure 1 As shown, the labor-saving rotating device includes a handle 5, which is fixed to the rear end of the clamping bolt 4 and forms a T-shaped structure with the clamping bolt 4.

[0026] In the automatic tool anchor, when the spring is pre-compressed, the force of the spring is between 10kg and 16kg. If it is a 7-hole clip, the total axial force on the entire automatic tool anchor is 70kg to 112kg. It is impossible to push the automatic tool anchor in by manpower. What's more, there is a 22-hole tool anchor, whose maximum axial force reaches 352kg. The locking and clamping device mainly relies on circumferential rotation. During rotation, the axial force is not considered, only the circumferential force is considered, that is, the axial force multiplied by the friction coefficient. The calculation diagram of the circumferential force is as follows: Figure 3 As shown:

[0027] The formula for calculating the hoop force is:

[0028] Where μ is the static friction coefficient of steel on steel, μ = 0.15; N is the axial force generated by the spring;

[0029] For a 300-ton, 7-beam tool anchor, the axial force N = 112 kg, and the hoop force is:

[0030]

[0031] For a 300-ton, 13-beam tool anchor, the axial force N = 208 kg, and the hoop force is:

[0032]

[0033] For a 550-ton, 22-beam tool anchor, the axial force N = 352 kg, and the hoop force is:

[0034]

[0035] First of all, from the perspective of axial force, a force of 112 kg cannot be pushed by human power. In addition, the circumferential movement mainly requires overcoming the circumferential friction torque.

[0036] From the above formula, we can get that the circumferential force that overcomes the axial force is the same. If the friction ring is large, the friction torque will be large. Therefore, if the friction ring is on the center circle of the bellows, its friction torque is:

[0037] M f =250F;

[0038] If an M12 clamping bolt 4 is used, the friction torque is:

[0039] M f =12F;

[0040] If the M12 clamping bolt 4 is equipped with a handle 5 with a length of 100 mm, then:

[0041] 100F 手 =12F;

[0042] F 手 =0.12F;

[0043] The labor-saving principle of the handle 5 is as follows Figure 4 As shown, the handle 5 and the clamping bolt 4 form a T-shaped threaded handle. The T-shaped threaded handle is based on the idea of ​​saving effort by the thread and the torque arm to achieve hydraulic operation without installation and realize the installation of automatic anchors. The specific method is:

[0044] 1) The thread on the T-thread handle rotates in the circumferential direction to produce an axial forward push, which is equivalent to lifting a 100kg object vertically by 20mm. It is impossible to lift it directly by manpower, but if a gentle slope with a 1:10 rotation is made, it can be moved by manpower. In addition, the 100kg force will produce friction resistance on the gentle slope. According to the sliding friction coefficient of steel on steel is 0.12, the friction resistance will increase by 12kg. The thread diameter on the T-thread handle is generally 12-16mm, and the length of the T-thread handle is generally 120mm. This can save 1 / 10 of the force. Therefore, through two labor-saving operations, the automatic anchor can be directly installed into the jack without operations such as ejection and return.

[0045] By using the T-thread handle, there is no need to perform operations such as ejection and re-ejection. The clamping device can be directly installed using the T-thread handle to open the clamp.

[0046] Calculated based on 550 tons and 22 holes: F 手 =0.12F=0.12×26.4=3.17kg.

[0047] Example 2: Figure 2 As shown, the labor-saving rotating device includes a mounting seat 6, a nut gear 7, a moving gear 8, a bearing 9 and an operating handle 10. The mounting seat 6 is located outside the jack 2. Specifically, the mounting seat 6 is movably fitted on the rear end of the cylinder body 22 of the jack 2; the nut gear 7 is fixed to the rear end of the clamping bolt 4 and is located in the mounting seat 6. The moving gear 8 is installed in the mounting seat 6 through the bearing 9 and engages with the nut gear 7. The operating handle 10 is fixedly mounted outside the mounting seat 6.

[0048] If there are too many anchor holes, it is difficult to turn the ordinary T-thread handle. Figure 2 The labor-saving rotating device is mainly composed of a nut gear and an inner ring moving gear. In order to facilitate the installation of the moving gear, a mounting seat and a bearing are provided. In order to facilitate rotation, an operating handle is also provided on the mounting seat. Since the diameter of the operating handle is more than 3 times larger than that of an ordinary handle, it can reduce F 手 More than 3 times, and more convenient for people to apply force.

[0049] The invention provides an automatic tool anchor which is easy to install. Without the need for operations such as ejection and return, a labor-saving rotating device is provided on the clamping device, so that the clamping device can be installed with little effort, thereby opening the clamping piece.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic tool anchor that is easy to install, characterized by: The invention comprises a tool anchor (1), a jack (2), a clamping device (3) and a clamping bolt (4); the tool anchor (1) is installed in a piston (21) of the jack (2); the rear end of the tool anchor (1) is provided with the clamping device (3) for clamping the tool anchor (1); the rear end of the clamping device (3) is fastened to the rear end surface of the piston (21) through the clamping bolt (4); the rear end of the clamping bolt (4) is provided with a labor-saving rotating device for driving the clamping bolt (4) to rotate; There are at least two clamping bolts (4), and the rear end of the clamping device (3) is fastened to the rear end surface of the piston (21) through at least two clamping bolts (4); The clamping device (3) comprises a clamping device body (31) located in the piston (21) of the jack (2) for clamping the tool anchor (1), and also comprises a clamping cover (32) connected to the clamping device body (31) and located outside the rear end of the jack (2), the clamping cover (32) being provided with a threaded through hole, the piston (21) being provided with a threaded blind hole directly opposite to the threaded through hole, the thread on the clamping bolt (4) matching the thread in the threaded through hole and the threaded blind hole, the clamping bolt (4) being rotated from the threaded through hole into the threaded blind hole, so that the rear end of the clamping device (3) is tightly connected with the rear end face of the piston (21).

2. The easy-to-install automatic tool anchor according to claim 1, characterized in that: All the clamping bolts (4) are evenly distributed along the annular direction.

3. The easy-to-install automatic tool anchor according to any one of claims 1 to 2, characterized in that: The labor-saving rotating device comprises a handle (5), wherein the handle (5) is fixed to the rear end of the clamping bolt (4) and forms a T-shaped structure with the clamping bolt (4).

4. The easy-to-install automatic tool anchor according to any one of claims 1 to 2, characterized in that: The labor-saving rotating device comprises a mounting seat (6), a nut gear (7), a moving gear (8), a bearing (9) and an operating handle (10); the mounting seat (6) is located outside the jack (2); the nut gear (7) is fixed to the rear end of the clamping bolt (4) and is located inside the mounting seat (6); the moving gear (8) is installed inside the mounting seat (6) through the bearing (9) and meshes with the nut gear (7); and the operating handle (10) is fixedly installed outside the mounting seat (6).

5. The easy-to-install automatic tool anchor according to claim 4, characterized in that: The mounting seat (6) is movably fitted to the rear end of the cylinder body (22) of the jack (2).

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