A prestressed tensioning jack for mounting and dismounting tool anchors from the rear

Abstract

The utility model provides a kind of prestressed tensioning jack, belong to prestressed tensioning jack technical field, especially involve a kind of prestressed tensioning jack of tool anchor from rear installation and disassembly, including anchor cup, the one side of anchor cup is integrally connected with hydraulic inner cylinder, and the inside of hydraulic inner cylinder and anchor cup is equipped with the tool anchor corresponding with its shape, the end of tool anchor away from anchor cup is equipped with the screwing of corresponding hydraulic inner cylinder, the other side of hydraulic inner cylinder is equipped with back cover, by expanding the core inner hole diameter of the rear portion of tensioning jack, allow tool anchor to be loaded from the rear portion of inner hole, and increase a screwing part in rear portion, so that tool anchor can be placed and disassembled from the rear portion of complete machine.

Description

Technical Field

[0001] This utility model provides a prestressed tensioning jack, belonging to the technical field of prestressed tensioning jacks, and particularly relates to a prestressed tensioning jack that allows for the installation and removal of tool anchors from the rear. Background Technology

[0002] Prestressed steel strand support technology is widely used in the permanent and some temporary support of the roof and sidewalls of coal mine roadways, and the main equipment used is the prestressed tensioning jack. At present, the basic structure of prestressed tensioning jacks produced by various manufacturers in coal mine roadway support construction is roughly the same.

[0003] Patent No. CN201320266477.5 discloses a prestressed tensioning jack, comprising: a top anchor pipe, a top pressure device body, a top pressure spring, a top wedge ring, an anchor cup, a tool anchor, a reset spring seat, a reset spring, an inner cylinder, a middle cylinder, an outer cylinder, a right-angle connector, a return oil pipe, a ferrule, a positive angle connector seat, a sealing cap, a locking ring, a threaded cap, a return cylinder oil port, and a cylinder outlet oil port. The top pressure spring lies within the top wedge ring, pressing against the tail of the top anchor pipe; the top wedge ring is threaded to the top pressure device body; the top pressure device body is threaded to the middle cylinder; the reset spring seat is fitted with a reset spring, pressing against the tail of the tool anchor; the tool anchor and the anchor cup are wedge-fitted by an 8° inclined plane; the anchor cup is threaded to the inner cylinder; the sealing cap fastens the outer cylinder; the locking ring locks the groove in the inner cylinder; the threaded cap is threaded to the outer cylinder and tightens the locking ring; a return oil port is provided at the inlet of the return oil pipe; and a cylinder outlet oil port is installed above the positive angle connector seat. When replacing the tool anchor, it is difficult to disassemble the relevant parts of the existing prestressed tensioning jack, and it is difficult to guarantee the set tightening torque during reinstallation, which affects product quality. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this application provides a prestressed tensioning jack that allows for rear-mounted and rear-mounted tool anchors, thus solving the problem of inconvenient assembly and disassembly of existing prestressed tensioning jacks.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a prestressed tensioning jack for installing and removing tool anchors from the rear, comprising an anchor cup, wherein a hydraulic inner cylinder is integrally connected to one side of the anchor cup, and a tool anchor corresponding to its own shape is provided inside the hydraulic inner cylinder and the anchor cup, wherein a screw plug corresponding to the hydraulic inner cylinder is provided at the end of the tool anchor away from the anchor cup, and a rear cover is provided on the other side of the hydraulic inner cylinder.

[0006] Preferably, the rear cover is fitted with a hydraulic outer cylinder of its own shape, and the end of the hydraulic outer cylinder away from the rear cover is provided with a top pressure device placed at the front end of the tool anchor.

[0007] Preferably, the top press is externally fitted with a hydraulic intermediate cylinder placed between the hydraulic inner cylinder and the hydraulic outer cylinder, a sealing ring is provided between the hydraulic inner cylinder and the hydraulic outer cylinder, and the hydraulic intermediate cylinder and the top press are connected by threads.

[0008] Preferably, a reset spring seat is connected to the screw plug via a reset spring, and the reset spring seat and the tool anchor are in elastic contact.

[0009] Preferably, the hydraulic inner cylinder has a cone angle inside at one end near the tool anchor, with the cone angle ranging from 12° to 20°, and the plug is connected to the rear end of the hydraulic inner cylinder by a thread.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] This invention increases the diameter of the inner core hole at the rear of the tension jack, allowing the tool anchor to be inserted from the rear of the inner hole. A screw plug is added at the rear, enabling the tool anchor to be installed and removed from the rear of the machine. This simplifies tool anchor replacement, and the screw plug is unaffected by tension force, requiring less tightening torque. The simplified structure ensures the quality of the device.

[0012] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of a prestressed tensioning jack.

[0014] Figure 2 This is a cross-sectional view of a prestressed tensioning jack for installing and removing tool anchors from the rear, according to this utility model.

[0015] As shown in the figure:

[0016] 1. Anchor cup; 2. Hydraulic inner cylinder; 3. Tool anchor; 4. Plug; 5. Rear cover; 6. Hydraulic outer cylinder; 7. Top presser; 8. Hydraulic middle cylinder; 9. Return spring; 10. Return spring seat; 11. Sealing cover; 12. Locking nut. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise defined, 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 invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] like Figure 2 As shown, a prestressed tensioning jack with a tool anchor installed and removed from the rear includes an anchor cup 1. The anchor cup 1 is characterized by an integrally connected hydraulic inner cylinder 2 on one side. The hydraulic inner cylinder 2 and the anchor cup 1 are equipped with a tool anchor 3 corresponding to their respective shapes. The end of the tool anchor 3 furthest from the anchor cup 1 is provided with a screw plug 4 corresponding to the hydraulic inner cylinder 2. The end of the hydraulic inner cylinder 2 closest to the tool anchor 3 is provided with a 16° cone angle. The screw plug 4 is connected to the rear end of the hydraulic inner cylinder 6 via threads. The other side of the hydraulic inner cylinder 2 is provided with a rear cover 5.

[0021] In this embodiment, the design improvement of the prestressed tensioning jack involves expanding the diameter of the core inner hole at the rear end of the equipment to facilitate the assembly and removal of the tool anchor 3 through the rear end of the inner hole. Furthermore, this design adds a screw plug 4 assembly at the rear end, enabling axial installation and disassembly of the tool anchor 3 from the rear end of the equipment. This design simplifies the replacement process of the tool anchor 3, and because the screw plug 4 is not subjected to prestressed tension, the tightening torque required for its installation is significantly reduced, thereby improving the convenience and reliability of tool anchor 3 replacement.

[0022] It should be noted that, Figure 1This is a schematic diagram of a common prestressed tensioning jack structure, illustrating a general-purpose prestressed tensioning jack mainly composed of the following components: jacking device, anchor cup, tool anchor, return spring seat, return spring, hydraulic inner cylinder, hydraulic middle cylinder, hydraulic outer cylinder, sealing cover 11, locking nut 12, and rear cover. Among these, the tool anchor is a consumable part; its internal teeth may wear or burn, requiring frequent replacement during construction. Replacing with a new one requires disassembling the front jacking device, anchor cup, and other threaded components. These threaded components directly bear the tension force and have high tightening torque requirements during factory assembly. If tool anchor replacement is performed on-site in the tunnel, disassembling the jacking device, anchor cup, and other threaded components is difficult due to the lack of clamping equipment such as vises. Even after disassembly, reassembling these threaded components may not guarantee that they can be tightened to the factory torque requirements, potentially leading to product quality issues for the reuse of the tensioning jack.

[0023] As a preferred embodiment, the prestressed tensioning jack for installing and removing tool anchors from the rear of this utility model integrates the anchor cup and the hydraulic inner cylinder into a single piece of material, compared to the existing structure where the anchor cup is a separate component.

[0024] As another preferred embodiment, the prestressed tensioning jack for installing and removing tool anchors from the rear of this utility model, compared with the existing structure, integrates the sealing cover 11 onto the locking nut 12 based on the previous preferred embodiment, and the locking nut 12 is threadedly connected to the hydraulic inner cylinder.

[0025] As another preferred embodiment, the prestressed tensioning jack for installing and removing tool anchors from the rear of this utility model, compared with the existing structure, removes the sealing cover 11 and the locking nut 12 based on the previous preferred embodiment. The new structure integrates the sealing cover 11 and the locking nut 12 into the hydraulic inner cylinder, forming a single unit.

[0026] like Figure 2 As shown, a hydraulic outer cylinder 6 with its own shape is fitted on the outside of the rear cover 5. A top pressure device 7 is provided at the end of the hydraulic outer cylinder 6 away from the rear cover 5 and placed at the front end of the tool anchor 3. A hydraulic middle cylinder 8 is fitted on the outside of the top pressure device 7 and placed between the hydraulic inner cylinder 2 and the hydraulic outer cylinder 6. A sealing ring is provided between the hydraulic inner cylinder 2 and the hydraulic outer cylinder 6. The hydraulic middle cylinder 8 and the top pressure device 7 are connected by threads. A return spring seat 10 is connected to the screw plug 4 through a return spring 9. The return spring seat 10 and the tool anchor 3 are in elastic contact.

[0027] In this embodiment, the tool anchor is inserted from the rear of the central hole of the hydraulic inner cylinder, and a screw-like structure, using a threaded or clamping structure, secures the tool anchor, return spring seat, and return spring within the central hole. The anchor cup is integrated with the hydraulic inner cylinder; that is, a 12°-20° inner conical surface is machined on the left side of the central hole of the hydraulic inner cylinder, which can cooperate with the outer conical surface of the tool anchor to form a locking anchor relationship. This improved design of the prestressed tensioning jack eliminates the need to disassemble the top pressure device and anchor cup, thereby reducing the operational complexity of replacing the tool anchor and maintaining the initial installation accuracy of the top pressure device's threaded connection. By omitting components such as the anchor cup, sealing cap 11, and locking nut 12, as well as their corresponding sealing elements, the structure of the equipment is simplified, thereby simplifying the assembly process. Furthermore, since the screw plug is not subjected to prestressed tension, the tightening torque required for its installation is significantly reduced, allowing for convenient replacement of the tool anchor at coal mine roadway construction sites simply by loosening the screw plug, greatly improving maintenance and replacement efficiency.

[0028] During production:

[0029] 1. Install tool anchor:

[0030] Insert the tool anchor 3 into the rear center hole of the hydraulic inner cylinder 2 until its front end matches the inner conical surface of the cone angle.

[0031] The plug 4 is fixed to the rear end of the hydraulic inner cylinder 2 by a threaded connection to ensure that the tool anchor 3 is correctly positioned.

[0032] 2. Install the return spring assembly:

[0033] Compress the return spring 5 and place it between the return spring seat 9 and the tool anchor 3 to ensure elastic contact between the two.

[0034] 3. Assemble the hydraulic cylinder assembly:

[0035] The hydraulic cylinder 8 and the top press 7 are connected by threads, and the top press 7 is placed at the front end of the tool anchor 3.

[0036] The outer hydraulic cylinder 6 is fitted onto the outside of the rear cover 5, and the inner hydraulic cylinder 2 is pressed tightly into the outer hydraulic cylinder 6 through the screw plug 4.

[0037] The above operations are for assembly before the product leaves the factory.

[0038] When using it:

[0039] 1. Preparations:

[0040] Ensure all necessary tools and safety equipment are in place, including wrenches, jacks, safety glasses, and gloves.

[0041] Check the hydraulic system to ensure it is functioning properly and that the hydraulic oil is clean and adequately supplied.

[0042] 2. Positioning the jack:

[0043] Position the tensioning jack at the location where prestress needs to be applied, ensuring it is stable and correctly aligned.

[0044] 4. Tensioning operation:

[0045] Start the hydraulic system so that the hydraulic oil pushes the tool anchor 3 forward through the hydraulic inner cylinder 2, thereby applying prestress.

[0046] Monitor tension and elongation to ensure that design requirements are met.

[0047] 5. Lock the tension:

[0048] When the required tension is reached, stop the hydraulic system's oil supply and lock the plug 4 to maintain the tension.

[0049] 6. Complete tensioning:

[0050] Once it is confirmed that the tensioning jacks are stable and the prestress remains unchanged, the jacks can be removed or their positions readjusted for the next step of the operation.

[0051] 7. Cleaning and maintenance:

[0052] After completing the work, clean the jack and tools, check for wear or damage, and perform necessary maintenance.

[0053] 8. Replace the tool anchor:

[0054] If tool anchor 3 needs to be replaced, simply loosen plug 4 and remove the old tool anchor 3 from the rear of hydraulic cylinder 2.

[0055] Insert the new tool anchor 3 into the rear center hole of the hydraulic inner cylinder 2 and re-secure it with the screw plug 4.

[0056] It should be noted that customers only need to prepare the tools for tensioning and installation.

[0057] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A prestressed tensioning jack for installing and removing tool anchors from the rear, comprising an anchor cup (1), characterized in that: The anchor cup (1) is integrally connected to a hydraulic inner cylinder (2) on one side. The hydraulic inner cylinder (2) and the anchor cup (1) are provided with a tool anchor (3) corresponding to their own shape. The end of the tool anchor (3) away from the anchor cup (1) is provided with a screw plug (4) corresponding to the hydraulic inner cylinder (2). The other side of the hydraulic inner cylinder (2) is provided with a back cover (5).

2. The prestressed tensioning jack for installing and removing tool anchors from the rear, as described in claim 1, is characterized in that: The rear cover (5) is fitted with a hydraulic outer cylinder (6) corresponding to its own shape. The end of the hydraulic outer cylinder (6) away from the rear cover (5) is provided with a top pressure device (7) placed at the front end of the tool anchor (3). The hydraulic outer cylinder (6) and the rear cover (5) are connected by threads.

3. A prestressed tensioning jack for installing and removing tool anchors from the rear, as described in claim 2, is characterized in that: The top press (7) is externally fitted with a hydraulic intermediate cylinder (8) placed between the hydraulic inner cylinder (2) and the hydraulic outer cylinder (6). A sealing ring is provided between the hydraulic inner cylinder (2) and the hydraulic outer cylinder (6). The hydraulic intermediate cylinder (8) and the top press (7) are connected by threads.

4. A prestressed tensioning jack for installing and removing tool anchors from the rear, as described in claim 1, characterized in that: The screw plug (4) is connected to a reset spring seat (10) via a reset spring (9), and the reset spring seat (10) and the tool anchor (3) are in elastic contact.

5. A prestressed tensioning jack for installing and removing tool anchors from the rear, as described in claim 1, characterized in that: The hydraulic inner cylinder (2) has a cone angle inside at one end near the tool anchor (3), with the cone angle ranging from 12° to 20°. The plug (4) is connected to the rear end of the hydraulic inner cylinder (2) by a thread.

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