Self-tightening inner hole grabbing device

Abstract

This utility model relates to the field of steam turbine technology and discloses a self-tightening internal hole gripping device, including a mandrel and a first positioning sleeve. The first positioning sleeve has a small-diameter end and a large-diameter end, and the small-diameter end and the large-diameter end are coaxially provided with through holes. The mandrel passes through the through holes of the small-diameter end and the large-diameter end in sequence, and the mandrel can move axially relative to the first positioning sleeve. One end of the mandrel is connected to a lifting ring, and the other end is connected to a truncated cone with a radius that gradually increases from left to right. The radius of the through hole at the large-diameter end is larger than the maximum radius of the truncated cone, and the radius of the through hole at the small-diameter end matches the radius of the mandrel. At least two equidistant movable parts are slidably installed on the large-diameter end. One end of the movable part is located inside the first positioning sleeve, and the end is an arc-shaped structure that matches the side wall of the truncated cone. The other end is located outside the first positioning sleeve. When the mandrel moves axially towards the lifting ring, the truncated cone pushes the movable parts to move outward of the first positioning sleeve. This utility model is beneficial for reducing labor intensity and safety risks, as well as improving installation accuracy.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a self-tightening internal hole gripping device. Background Technology

[0002] Valves in nuclear power, gas turbine, and thermal turbine units often include irregularly shaped and extra-long sleeves. When lifting bolt holes cannot be used during installation, or the product itself lacks lifting bolt holes, manual installation is often necessary. However, manual installation presents the following technical challenges: 1. The product is heavy, requiring significant physical exertion and making prolonged handling impossible; 2. Sleeves are generally interference-fitted, requiring liquid nitrogen or heat treatment for installation, posing safety risks with manual handling; 3. Some sleeves need to be inserted into deep holes, exceeding arm length, leading to quality risks such as misalignment and jamming. Utility Model Content

[0003] The technical objective of this utility model is to address the shortcomings of the prior art by providing a self-tightening internal hole gripping device that reduces manual labor intensity, lowers safety risks, and improves installation accuracy.

[0004] The technical solution adopted in this utility model is as follows: A self-tightening internal hole gripping device includes a mandrel and a first positioning sleeve. The first positioning sleeve has a small diameter end and a large diameter end. The small diameter end and the large diameter end are respectively provided with through holes on the same axis. The mandrel passes through the through holes of the small diameter end and the large diameter end in sequence, and the mandrel can move axially relative to the first positioning sleeve. One end of the mandrel is connected to a lifting ring along its axial direction, and the other end is connected to a frustum of diameter that gradually increases in radius from left to right. The radius of the through hole at the large diameter end is greater than the maximum radius of the frustum of diameter, and the radius of the through hole at the small diameter end is smaller than the radius of the through hole at the large diameter end. The radius of the through hole at the small diameter end matches the radius of the mandrel. At least two equidistant movable parts are slidably mounted on the large-diameter end. One end of each movable part is located inside the first positioning sleeve and has an arc-shaped structure that matches the side wall of the truncated cone. The other end is located outside the first positioning sleeve. When the mandrel moves axially toward the lifting ring, the truncated cone pushes the movable part to move outward toward the outside of the first positioning sleeve.

[0005] The above-mentioned technical measures involve placing the inner hole gripping device into the inner hole of the workpiece to be loaded, and using the lifting ring on the mandrel to bear the external lifting force through hoisting or other means, so that the mandrel moves axially toward the lifting ring. During this process, the truncated cone pushes the movable part to move to the outside of the first positioning sleeve until the movable part presses against the inner wall of the inner hole of the workpiece to be loaded, thereby achieving the clamping of the inner hole of the workpiece to be loaded. By lifting the lifting ring, the workpiece to be loaded is lifted, thereby realizing the hoisting of the workpiece to be loaded.

[0006] The aforementioned technical measures utilize a frustum to push the moving part to achieve clamping of the inner hole, thereby enabling the gripping of the inner hole. This allows for the use of hoisting equipment to lift the workpiece to be installed, avoiding manual handling, reducing safety risks, and improving installation accuracy. The radius of the through hole at the large-diameter end is larger than the maximum radius of the frustum, while the radius of the through hole at the small-diameter end is smaller than that at the large-diameter end. This helps ensure the normal movement of the frustum within the through hole at the large-diameter end, while also preventing excessive displacement of the frustum. The radius of the through hole at the small-diameter end matches the radius of the mandrel, which helps ensure the stability of the mandrel during movement.

[0007] Furthermore, the inner hole gripping device also includes a limiting sleeve fitted on the mandrel and a limiting rod penetrating the mandrel, wherein the limiting sleeve is threadedly connected to the small diameter end of the first positioning sleeve; The limiting sleeve is provided with two symmetrically distributed guide holes, which extend along the axial direction of the mandrel, and the two ends of the limiting rod are slidably connected to the two guide holes respectively.

[0008] The above-mentioned technical measures include setting a limiting sleeve and a limiting rod, and setting two symmetrically distributed guide holes on the limiting sleeve. The guide holes extend along the axial direction of the mandrel, and the two ends of the limiting rod are slidably connected to the two guide holes respectively, so that the limiting rod can only slide within the guide holes along the axial direction of the mandrel, thereby preventing the mandrel from rotating and ensuring stability.

[0009] Furthermore, the inner hole gripping device also includes a second positioning sleeve fitted on the mandrel, the second positioning sleeve being threadedly connected to the limiting sleeve, and the second positioning sleeve, the limiting sleeve, and the first positioning sleeve being threadedly connected in sequence. The second positioning sleeve has a through hole for the mandrel to pass through, and the radius of the through hole of the second positioning sleeve matches the radius of the mandrel.

[0010] The above-mentioned technical measures, by setting a second positioning sleeve fitted on the mandrel, with the radius of the insertion hole of the second positioning sleeve matching the radius of the mandrel, help to ensure the stability of the mandrel during movement.

[0011] Furthermore, there are three movable parts, and correspondingly, the large-diameter end is provided with three mounting holes for mounting the movable parts.

[0012] The above-mentioned technical measures, by setting up three moving parts, help to ensure the stability of the clamping force.

[0013] Furthermore, the movable component has a movable part, a support part, and a clamping part connected in sequence; The movable part has an integrally formed limiting part and a connecting part. The limiting part is located inside the first positioning sleeve, and the connecting part is slidably connected to the mounting hole and extends through the mounting hole to the outside of the first positioning sleeve. The bottom of the limiting part is an arc-shaped structure that matches the side wall of the frustum. The support is fixedly connected to the top of the connection by bolts; The clamping part is fixedly connected to the top of the support part by bolts; The limiting part can abut against the inner wall of the first positioning sleeve, and the supporting part can abut against the outer wall of the first positioning sleeve; When the mandrel moves axially toward the lifting ring, the frustum pushes the connecting part of the movable part to move outward through the mounting hole toward the outside of the first positioning sleeve.

[0014] The aforementioned technical measures involve a sliding connection between the connecting part and the mounting hole. A frustum pushes the movable part, causing the connecting part to move outward through the mounting hole towards the outside of the first positioning sleeve. This allows the abutting part to press against the inner wall of the workpiece to be installed, achieving inner hole gripping. The limiting part abuts against the inner wall of the first positioning sleeve, restricting the displacement of the connecting part and preventing excessive displacement that could cause the movable part to detach. Simultaneously, the supporting part abuts against the outer wall of the first positioning sleeve, preventing the movable part from detaching. The coordinated cooperation of the supporting part and the limiting part helps ensure the installation stability of the movable part on the first positioning sleeve. The supporting part is fixedly connected to the top of the connecting part by bolts, and the abutting part is fixedly connected to the top of the supporting part by bolts, facilitating the assembly and disassembly of the components.

[0015] Furthermore, the top of the connecting portion and the bottom of the supporting portion form a concave-convex mating structure.

[0016] In the above technical measures, the connecting part and the supporting part form a concave-convex fit structure, and then bolts are used for fixing, which helps to improve the connection stability.

[0017] Furthermore, the top of the support portion has a groove, and the abutting portion is embedded in the groove.

[0018] The above-mentioned technical measures, by embedding the clamping part into the groove of the support part and then fixing it with bolts, help to improve the connection stability.

[0019] Furthermore, the top of the abutting part has an arc-shaped structure.

[0020] The above-mentioned technical measures, by setting the top of the clamping part to an arc-shaped structure, help to increase the contact surface with the inner hole, improve the gripping stability, and reduce the risk of workpiece scratches.

[0021] Furthermore, the clamping part is made of copper.

[0022] In the above-mentioned technical measures, the clamping part is made of copper, which has low hardness and helps to reduce the risk of scratching the workpiece.

[0023] Furthermore, the lifting ring is threadedly connected to the mandrel.

[0024] The above-mentioned technical measures involve threaded connection between the lifting eye and the mandrel, facilitating disassembly and assembly.

[0025] One or more technical solutions provided by this utility model have at least the following technical effects or advantages: This invention involves placing an inner hole gripping device into the inner hole of the workpiece to be loaded. The mandrel, supported by a lifting ring, is lifted using methods such as hoisting. This causes the mandrel to move axially towards the lifting ring. During this process, the truncated cone pushes a movable component, causing it to move outwards towards the outer side of the first positioning sleeve until the movable component presses against the inner wall of the workpiece's inner hole, thus achieving tight clamping of the workpiece's inner hole. The lifting ring then lifts the workpiece, enabling its hoisting.

[0026] This invention utilizes a frustum to push the movable part to tighten the inner hole, thereby achieving inner hole gripping. This allows for the use of hoisting equipment to lift the workpiece, avoiding manual handling, reducing safety risks, and improving installation accuracy. The radius of the through hole at the large-diameter end is larger than the maximum radius of the frustum, while the radius of the through hole at the small-diameter end is smaller than that at the large-diameter end. This ensures the normal movement of the frustum within the through hole at the large-diameter end while preventing excessive displacement of the frustum. The radius of the through hole at the small-diameter end matches the radius of the mandrel, ensuring the stability of the mandrel during movement. Attached Figure Description

[0027] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof. Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the mandrel in this utility model; Figure 3 This is a cross-sectional view of the first positioning sleeve in this utility model; Figure 4 This is a cross-sectional view of the limiting sleeve in this utility model; Figure 5 This is a cross-sectional view of the second positioning sleeve in this utility model; Among them, 1-mandrel; 2-first positioning sleeve; 3-lifting ring; 4-frustum; 5-moving part; 51-moving part; 511-limiting part; 512-connecting part; 52-supporting part; 53-tightening part; 6-limiting sleeve; 7-limiting rod; 8-second positioning sleeve. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0030] Reference Figures 1-5 This embodiment provides a self-tightening internal hole gripping device. The internal hole gripping device includes a spindle 1 and a first positioning sleeve 2. The first positioning sleeve 2 has a small diameter end and a large diameter end. The small diameter end and the large diameter end are respectively provided with through holes on the same axis. The spindle 1 passes through the through holes of the small diameter end and the large diameter end in sequence, and the spindle 1 can move axially relative to the first positioning sleeve 2. One end of the spindle 1 is connected to a lifting ring 3, and the other end is connected to a frustum 4 whose radius gradually increases from left to right. The radius of the through hole at the large diameter end is greater than the maximum radius of the frustum 4, and the radius of the through hole at the small diameter end is smaller than the radius of the through hole at the large diameter end. The radius of the through hole at the small diameter end matches the radius of the spindle 1. From left to right, it refers to the direction from the hanging ring 3 to the truncated cone 4.

[0031] Among them, the lifting ring 3 is threadedly connected to the mandrel 1; the mandrel 1 and the frustum 4 can be integrally formed.

[0032] At least two equidistant movable parts 5 are slidably installed on the large-diameter end. One end of the movable part 5 is located inside the first positioning sleeve 2 and the end is an arc-shaped structure that matches the side wall of the truncated cone 4. The other end is located outside the first positioning sleeve 2. When the spindle 1 moves axially toward the lifting ring 3, the truncated cone 4 pushes the movable part 5 to move to the outside of the first positioning sleeve 2.

[0033] There are three movable parts 5, and correspondingly, there are three mounting holes on the large-diameter end for mounting the movable parts 5.

[0034] The quantity of active component 5 can be determined according to the actual situation.

[0035] The movable part 5 has a movable part 51, a support part 52, and a clamping part 53 connected in sequence; The movable part 51 has an integrally formed limiting part 511 and a connecting part 512. The limiting part 511 is located inside the first positioning sleeve 2, and the connecting part 512 is slidably connected to the mounting hole and extends to the outside of the first positioning sleeve 2 through the mounting hole. The bottom of the limiting part 511 is an arc-shaped structure that matches the side wall of the frustum 4. The support part 52 is fixedly connected to the top of the connecting part 512 by bolts; the top of the connecting part 512 and the bottom of the support part 52 form a concave-convex fit structure, wherein the top of the connecting part 512 has a groove, and the bottom of the support part 52 has a protrusion that matches the groove on the top of the connecting part 512.

[0036] The clamping part 53 is fixedly connected to the top of the support part 52 by bolts; the top of the support part 52 has a groove, and the clamping part 53 is embedded in the groove. The top of the clamping part 53 has an arc-shaped structure, and the clamping part 53 is made of copper.

[0037] The limiting part 511 can abut against the inner wall of the first positioning sleeve 2, and the supporting part 52 can abut against the outer wall of the first positioning sleeve 2; When the spindle 1 moves axially toward the lifting ring 3, the truncated cone 4 pushes the connecting part 512 of the movable part 51 to move outward of the first positioning sleeve 2 through the mounting hole.

[0038] The internal hole gripping device also includes a limiting sleeve 6 fitted on the spindle 1 and a limiting rod 7 penetrating the spindle 1. The limiting sleeve 6 is threadedly connected to the small diameter end of the first positioning sleeve 2. The limiting sleeve 6 is provided with two symmetrically distributed guide holes, which extend along the axial direction of the spindle 1. The two ends of the limiting rod 7 are slidably connected to the two guide holes respectively.

[0039] The mandrel 1 has two symmetrically distributed holes for the insertion of the limiting rod 7.

[0040] The internal hole gripping device also includes a second positioning sleeve 8 fitted on the spindle 1. The second positioning sleeve 8 is threadedly connected to the limiting sleeve 6. The second positioning sleeve 8, the limiting sleeve 6 and the first positioning sleeve 2 are threadedly connected in sequence. The second positioning sleeve 8 has a through hole for the mandrel 1 to pass through, and the radius of the through hole of the second positioning sleeve 8 matches the radius of the mandrel 1.

[0041] During installation, select a suitable movable part 5 according to the size of the inner hole of the workpiece to be installed. First, slide the movable part 51 from inside the first positioning sleeve 2 into the mounting hole, so that the connecting part 512 of the movable part 51 extends from inside the first positioning sleeve 2 to outside the first positioning sleeve 2. Then, engage the protrusion of the support part 52 with the groove of the connecting part 512, and use two bolts to fix the support part 52 and the movable part 51 together. Then, insert the abutting part 53 into the groove of the support part 52, and use three bolts to fix the abutting part 53 to the support part 52 together. This completes the installation of one movable part 5. Repeat this process to complete the installation of three movable parts 5. Thread the second positioning sleeve 8, the limiting sleeve 6, and the first positioning sleeve 2 together in sequence, and fit them onto the mandrel 1 with the frustum 4. Align the two guide holes on the limiting sleeve 6 with the two holes on the mandrel 1, and then pass the limiting rod 7 through them in sequence to complete the installation of the limiting rod 7. Finally, thread the lifting ring 3 onto the mandrel 1 to complete the assembly of the inner hole gripping device.

[0042] In application, the inner hole gripping device is placed into the inner hole of the workpiece to be loaded, and the lifting ring 3 is connected by means of a lifting rope or shackle. If the workpiece to be loaded is a small workpiece, it can also be lifted by hand using the lifting ring 3. By applying a lifting force to the lifting ring 3, the spindle 1 moves axially toward the lifting ring 3. During this process, the truncated cone 4 pushes the movable part 5, causing the connecting part 512 of the movable part 51 to move to the outside of the first positioning sleeve 2 through the mounting hole until the pressing part 53 presses against the inner wall of the inner hole of the workpiece to be loaded, thereby achieving the pressing of the inner hole of the workpiece to be loaded. At this time, by lifting the lifting ring 3, the workpiece to be loaded is lifted, and the lifting of the workpiece to be loaded can be achieved.

[0043] To facilitate manual operation, handles can also be welded to both sides of the limiting sleeve 6.

[0044] After use, remove the lifting ring 3 to detach the spindle. Since the limiting part 511 can abut against the inner wall of the first positioning sleeve 2 and the supporting part 52 can abut against the outer wall of the first positioning sleeve 2, the moving part 5 will not fall off whether the inner hole gripping device is in use or not.

[0045] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A self-tightening internal hole gripping device, characterized in that: The inner hole gripping device includes a spindle (1) and a first positioning sleeve (2). The first positioning sleeve (2) has a small diameter end and a large diameter end. The small diameter end and the large diameter end are respectively provided with through holes on the same axis. The spindle (1) passes through the through holes of the small diameter end and the large diameter end in sequence, and the spindle (1) can move axially relative to the first positioning sleeve (2). One end of the mandrel (1) is connected to a lifting ring (3) in the axial direction, and the other end is connected to a frustum (4) whose radius gradually increases from left to right. The radius of the through hole at the large diameter end is greater than the maximum radius of the frustum (4), and the radius of the through hole at the small diameter end is smaller than the radius of the through hole at the large diameter end. The radius of the through hole at the small diameter end matches the radius of the mandrel (1). At least two equidistant movable parts (5) are slidably installed on the large-diameter end. One end of the movable part (5) is located inside the first positioning sleeve (2) and the end is an arc-shaped structure that matches the side wall of the frustum (4). The other end is located outside the first positioning sleeve (2). When the spindle (1) moves axially toward the lifting ring (3), the frustum (4) pushes the movable part (5) to move toward the outside of the first positioning sleeve (2).

2. The self-tightening internal hole gripping device according to claim 1, characterized in that: The inner hole gripping device also includes a limiting sleeve (6) fitted on the mandrel (1) and a limiting rod (7) penetrating the mandrel (1). The limiting sleeve (6) is threadedly connected to the small diameter end of the first positioning sleeve (2). The limiting sleeve (6) is provided with two symmetrically distributed guide holes, which extend along the axial direction of the spindle (1), and the two ends of the limiting rod (7) are slidably connected to the two guide holes respectively.

3. The self-tightening internal hole gripping device according to claim 2, characterized in that: The inner hole gripping device also includes a second positioning sleeve (8) fitted on the spindle (1), the second positioning sleeve (8) being threadedly connected to the limiting sleeve (6), and the second positioning sleeve (8), the limiting sleeve (6) and the first positioning sleeve (2) being threadedly connected in sequence; The second positioning sleeve (8) has a through hole for the mandrel (1) to pass through, and the radius of the through hole of the second positioning sleeve (8) matches the radius of the mandrel (1).

4. The self-tightening internal hole gripping device according to claim 1, characterized in that: There are three movable parts (5), and correspondingly, the large-diameter end is provided with three mounting holes for mounting the movable parts (5).

5. The self-tightening internal hole gripping device according to claim 4, characterized in that: The movable part (5) has a movable part (51), a support part (52), and a clamping part (53) connected in sequence. The movable part (51) has an integrally formed limiting part (511) and a connecting part (512). The limiting part (511) is located inside the first positioning sleeve (2). The connecting part (512) is slidably connected to the mounting hole and extends through the mounting hole to the outside of the first positioning sleeve (2). The bottom of the limiting part (511) is an arc-shaped structure that matches the side wall of the frustum (4). The support (52) is fixedly connected to the top of the connecting part (512) by bolts; The clamping part (53) is fixedly connected to the top of the support part (52) by bolts; The limiting part (511) can abut against the inner wall of the first positioning sleeve (2), and the supporting part (52) can abut against the outer wall of the first positioning sleeve (2); When the spindle (1) moves axially toward the lifting ring (3), the truncated cone (4) pushes the connecting part (512) of the movable part (51) to move outward of the first positioning sleeve (2) through the mounting hole.

6. The self-tightening internal hole gripping device according to claim 5, characterized in that: The top of the connecting part (512) and the bottom of the supporting part (52) form a concave-convex fit structure.

7. The self-tightening internal hole gripping device according to claim 5, characterized in that: The support (52) has a groove at the top, and the abutment (53) is embedded in the groove.

8. The self-tightening internal hole gripping device according to claim 7, characterized in that: The top of the abutting part (53) has an arc-shaped structure.

9. The self-tightening internal hole gripping device according to claim 5, characterized in that: The clamping part (53) is made of copper.

10. The self-tightening internal hole gripping device according to claim 1, characterized in that: The lifting ring (3) is threadedly connected to the spindle (1).

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