A straight-up hoisting tool for a closed-end bullet blank

Abstract

The utility model provides a kind of mouth closing bullet blank vertical hoisting tool, including lifting rod, sliding sleeve, clamping jaw and pin shaft, utilize the characteristics that the inside arc of bullet blank gradually reduces from bottom to mouth portion, through the opening and closing of clamping jaw, the inner arc surface without machining is clamped.The vertical hoisting tool is simple in structure, clamping jaw can be opened and closed quickly, mouth closing bullet blank is conveniently and labor-savingly transported to corresponding station, greatly reduces the labor intensity of worker;It is made of spring tool steel 65Mn, high-quality carbon tool steel T10A and high-quality carbon steel 45 steel, the durability of lifting appliance is improved by heat treatment of clamping jaw, pin shaft and lifting rod, the manufacturing cost is low, material is convenient and easy to get, and it is economical and suitable;It is suitable for clamping different caliber mouth closing bullet blank inner bore, and can be applied and popularized in ammunition manufacturing industry, with great economic benefit and extensive social benefit.

Description

Technical Field

[0001] This utility model belongs to the field of product hoisting technology, specifically relating to a hoisting fixture for vertically hoisting projectile blanks suitable for hoisting and moving projectile parts during cold working. Background Technology

[0002] Most conventional artillery shells have a cylindrical section in the middle and rear, and an arc-shaped section in the front. During mass production, for quick and convenient turnaround, the shells are often laid flat and transported to the next process by rolling on a worktable or conveyor. During machining, a ring-type clamp is used to hold the cylindrical part of the shell, and loading and unloading are performed on a CNC lathe. However, in certain special cases, such as the shell base flaw detection process, where the ultrasonic flaw detector has a vertical well-type structure, the shell must be placed into the flaw detector with its opening facing upwards. After ultrasonic flaw detection, the shell is removed and transported to the next process. Because the gap between the internal diameter of the flaw detector and the outer cylindrical surface of the projectile is small (2-3 mm), it is not possible to clamp and lift the projectile by holding the outer cylindrical surface of the projectile. Furthermore, the inner and outer surfaces of the projectile's arc-shaped part are unprocessed surfaces after being closed, and are inverted cone-shaped, which also cannot be clamped. Therefore, it is necessary to manually grasp the mouth of the projectile and vertically place it into the flaw detector for flaw detection and removal after flaw detection. The weight of each projectile blank is about 50 kg, and the labor intensity of the workers is very high.

[0003] Therefore, it is necessary to design a hoisting fixture that can lift upright, closed-end projectile blanks to facilitate and quickly lift the projectiles during the process, greatly reducing the labor intensity of operators. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] This utility model proposes a vertical hoisting fixture for a constricted projectile blank, in order to solve the technical problem of how to conveniently, quickly, and effortlessly hoist the projectile to a designated workstation to complete the corresponding inspection or processing operations during the process.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, this utility model proposes a vertical lifting fixture for a constricted projectile blank, which includes a lifting rod, a sliding sleeve, grippers, and a pin; wherein...

[0008] The sliding sleeve includes a cylindrical limiting post located above and a cylindrical guide post located below. The diameter of the limiting post is larger than that of the guide post. When using a vertical lifting fixture, the vertical lifting fixture is placed on the opening of the converging projectile blank through the limiting post, and the guide post extends into the inner cavity of the converging projectile blank. The center of the limiting post and the guide post are machined with a through axial guide hole, and the bottom side wall of the guide post is machined with an opening for extending the gripper and realizing the opening and closing conversion.

[0009] The lifting rod has a cylindrical structure with a gripper mounting groove machined at the bottom. The gripper is mounted in the gripper mounting groove via a pin and can freely open and close. The lower half of the lifting rod is inserted into the guide hole of the sliding sleeve, and the gripper can extend out from the opening of the sliding sleeve. The sliding sleeve can slide relative to the lifting rod. When the lifting rod slides up and down relative to the sliding sleeve, the gripper can rotate using the upper and lower end faces of the opening structure, so that the gripper can switch between open and closed states in the inner cavity of the closed projectile blank.

[0010] Furthermore, the limiting post and guide post of the sliding sleeve adopt an integrated structure.

[0011] Furthermore, two symmetrically arranged openings are machined on the bottom side wall of the guide post of the sliding sleeve; two symmetrically arranged gripper mounting slots are machined at the bottom end of the lifting rod.

[0012] Furthermore, a ring for connecting the hook is installed at the top.

[0013] Furthermore, a clearance fit is used between the gripper and the pin.

[0014] Furthermore, an interference fit is used between the pin and the lifting rod.

[0015] Furthermore, a clearance fit is used between the lifting rod and the sliding sleeve.

[0016] Furthermore, the lifting rod and grippers are made of spring tool steel 65Mn and quenched to a Rockwell hardness of HRC48-52.

[0017] Furthermore, the cylindrical pins are made of high-quality carbon tool steel T10A and quenched to a Rockwell hardness of HRC38-42.

[0018] Furthermore, the sliding sleeve is made of high-quality carbon steel 45.

[0019] (III) Beneficial Effects

[0020] This utility model proposes a vertical lifting fixture for a projectile blank with a tapered end, comprising a lifting rod, a sliding sleeve, grippers, and a pin. Utilizing the characteristic that the internal arc of the projectile blank gradually tapers from the bottom to the opening, the unmachined inner arc surface is clamped by opening and closing the grippers. This vertical lifting fixture has a simple structure, and the grippers can quickly open and close, conveniently and labor-savingly transporting the tapered projectile blank to the corresponding workstation, greatly reducing the labor intensity of workers. It is made of spring tool steel 65Mn, high-quality carbon tool steel T10A, and high-quality carbon steel 45. Heat treatment of the three vulnerable parts—grippers, pin, and lifting rod—improves the durability of the lifting fixture. The manufacturing cost is low, the materials are readily available, and it is economical and practical. It is suitable for clamping the inner bore of tapered projectile blanks of different calibers and can be applied and promoted in the ammunition manufacturing industry, yielding significant economic and social benefits. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the vertical lifting fixture structure and operation of the retractable projectile blank of this utility model (clamping jaws in retracted state);

[0022] Figure 2 This is a schematic diagram of the structure and operation of the vertical hoisting fixture for the constricted projectile blank of this utility model (clamps open). Detailed Implementation

[0023] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0024] This embodiment proposes a vertical lifting fixture for a projectile blank with a narrow opening. This fixture utilizes the characteristic that the internal arc of the projectile blank gradually narrows from the bottom to the opening, and is an opening and closing type lifting tool that can clamp the unmachined inner arc surface.

[0025] like Figure 1 As shown, the vertical lifting fixture for the constricted projectile blank mainly includes a lifting rod 1, a sliding sleeve 2, grippers 3, and a pin 4. The lifting rod 1 and sliding sleeve 2 form the main body of the fixture, creating a rotating assembly structure. The sliding sleeve 2 includes an upper cylindrical limiting post and a lower cylindrical guide post, which are integrated. The limiting post has a larger diameter than the guide post. When using the vertical lifting fixture, the limiting post is used to place the fixture on the opening of the constricted projectile blank, and the guide post extends into the inner cavity of the constricted projectile blank. The limiting post and guide post have through-hole axial guide holes machined in their centers. Two symmetrically arranged openings are machined on the bottom sidewall of the guide post for extending the grippers 3 and controlling their opening and closing.

[0026] The lifting rod 1 is a cylindrical structure with a ring at the top for connecting a hook. Two symmetrically arranged gripper mounting slots are machined at the bottom of the lifting rod 1, and two grippers 3 are respectively mounted in their corresponding slots via pins 4. A small clearance fit is used between the grippers 3 and the pins 4, allowing the grippers 3 to open and close freely. An interference fit is used between the pins 4 and the lifting rod 1, ensuring that the pins 4 are securely riveted to the lifting rod 1. The lower half of the lifting rod 1 is inserted into the guide hole of the sliding sleeve 2, and the two grippers 3 can extend from the two openings of the sliding sleeve 2. A small clearance fit is used between the lifting rod 1 and the sliding sleeve 2 to ensure that the sliding sleeve 2 slides freely on the lifting rod 1. When the lifting rod 1 slides up and down relative to the sliding sleeve 2, the grippers 3 can rotate using the upper and lower end faces of the corresponding opening structures, allowing the grippers 3 to switch between open and closed states within the inner cavity of the retractable projectile blank.

[0027] To ensure the service life of the vertical lifting fixture for the constricted projectile blank and reduce manufacturing costs, in this embodiment, the lifting rod 1 and the gripper 3 are made of spring tool steel 65Mn and quenched to a Rockwell hardness of HRC48-52, the cylindrical pin 4 is made of high-quality carbon tool steel T10A and quenched to a Rockwell hardness of HRC38-42, and the sliding sleeve 2 is made of high-quality carbon steel 45.

[0028] The method of using the vertical hoisting fixture for the constricted projectile blank of this utility model is as follows:

[0029] Before hoisting the projectile blank, the operator holds the sliding sleeve 2 with their left hand and pushes the lifting rod 1 downwards with their right hand, causing the lifting rod 1 to slide inside the sliding sleeve 2. As the lower part of the lifting rod 1 slides within the sliding sleeve 2, it simultaneously drives the gripper 3 fixed to the lifting rod 1 to slide downwards through the side opening of the sliding sleeve 2. As the gripper 3 slides downwards, it is restricted by the opening of the sliding sleeve 2 and closes inwards. After closing, the maximum outer diameter of the gripper 3 is smaller than the diameter of the projectile's opening. After closing, the operator inserts the lower part of the vertical hoisting fixture into the projectile blank from the opening. When the lower end face of the limiting post of the sliding sleeve 2 contacts the end face of the projectile's opening, the operator presses down on the sliding sleeve 2 with their left hand and hooks the upper ring of the lifting rod 1 with the crane hook, then starts the crane upwards. The hook moves the lifting rod 1 upwards, and the gripper 3, following the upward movement of the lifting rod 1, opens to both sides under gravity. After opening to a certain angle, it locks onto the inner surface of the projectile's bore. Figure 2 As shown. After clamping, release the left hand and continue to raise the crane to lift the projectile, completing the clamping and lifting action. When unloading the projectile, simply release the hook, push the lifting rod 1 downwards, causing the gripper 3 to move downwards within the guide hole of the sliding sleeve 2. This causes the lower edge of the gripper 3 to contact the opening edge of the sliding sleeve 2, and due to the restriction of the opening, it closes inwards. Finally, lift the sliding sleeve 2 upwards to remove the vertical lifting fixture from the projectile's internal cavity, completing the unloading operation.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A vertical hoisting fixture for a constricted projectile blank, characterized in that, The vertical lifting fixture for the constricted projectile blank includes a lifting rod, a sliding sleeve, grippers, and a pin; wherein... The sliding sleeve includes a cylindrical limiting post located above and a cylindrical guide post located below. The diameter of the limiting post is larger than that of the guide post. When using a vertical lifting fixture, the vertical lifting fixture is placed on the opening of the converging projectile blank through the limiting post, and the guide post extends into the inner cavity of the converging projectile blank. The center of the limiting post and the guide post are machined with a through axial guide hole, and the bottom side wall of the guide post is machined with an opening for extending the gripper and realizing the opening and closing conversion. The lifting rod has a cylindrical structure with a gripper mounting groove machined at its bottom. The gripper is mounted in the gripper mounting groove via a pin and can freely open and close. The lower half of the lifting rod is inserted into the guide hole of the sliding sleeve, and the gripper can extend out from the opening of the sliding sleeve. The sliding sleeve can slide relative to the lifting rod. When the lifting rod slides up and down relative to the sliding sleeve, the gripper can rotate using the upper and lower end faces of the opening structure, so that the gripper can switch between open and closed states within the inner cavity of the closed projectile blank.

2. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The limiting post and guide post of the sliding sleeve are of one-piece structure.

3. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The guide post of the sliding sleeve has two symmetrically arranged openings on its bottom side wall; the bottom end of the lifting rod has two symmetrically arranged gripper mounting grooves.

4. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The top of the lifting rod is fitted with a ring for connecting a hook.

5. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The gripper and the pin are fitted with a clearance.

6. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The pin and the lifting rod are fitted with an interference fit.

7. The vertical lifting fixture for the constricted projectile blank as described in claim 1, characterized in that, The lifting rod and the sliding sleeve are fitted with a clearance.

8. The vertical lifting fixture for the constricted projectile blank as described in any one of claims 1 to 7, characterized in that, The lifting rod and grippers are made of spring tool steel 65Mn and quenched to a Rockwell hardness of HRC48~52.

9. The vertical lifting fixture for the constricted projectile blank as described in any one of claims 1 to 7, characterized in that, The pin is made of high-quality carbon tool steel T10A and quenched to a Rockwell hardness of HRC38~42.

10. The vertical lifting fixture for the constricted projectile blank as described in any one of claims 1 to 7, characterized in that, The sliding sleeve is made of high-quality carbon steel 45.

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