Load limiting hoist used in cooperation with pistol drill

Abstract

The utility model discloses a load limiting hoist used in cooperation with a pistol drill, and the load limiting hoist comprises a housing which is provided with a connecting groove; the braking assembly is arranged in the shell and comprises a braking bolt, a self-locking nut, a braking gear, a self-lubricating steel sleeve, a belleville spring, a pressing piece and friction pieces, the self-lubricating steel sleeve is arranged on the inner wall of the braking gear, the friction pieces are arranged at the two ends of the braking gear, the braking bolt is sequentially sleeved with the braking gear, the pressing piece and the belleville spring, and the self-locking nut is arranged on the braking gear. The self-locking nut is connected to the front end of the brake bolt in a threaded mode and abuts against one end of the belleville spring. The long shaft is arranged at the axis position of the brake assembly and used for transmitting power generated by rotation of the brake gear; and the gear shaft is rotationally arranged in the connecting groove and used for driving the brake gear, and at least one part of the gear shaft extends out of the shell and is matched with a working head of the pistol drill.

Description

Technical Field

[0001] This application relates to the technical field of hoisting equipment, in particular to a load-limiting hoist used in conjunction with a pistol drill. Background Art

[0002] As a light and small hoisting device, the hoist is widely used in the industrial field and the construction field due to its small volume and simple structure.

[0003] The hoist is also divided into a manual hoist and an electric hoist. Although the traditional manual hoist has a simple structure and does not require electricity, when handling heavy objects, the operator needs to consume a lot of physical strength and the lifting speed is slow; while the electric hoist improves efficiency and saves manpower, however, for emergencies such as power outages, there are some potential safety hazards, and the cost of the electric hoist is often higher.

[0004] Of course, there are also hoists driven by a hand-held electric drill on the market. This kind of hoist solves the problems of the above two kinds of hoists to a certain extent, but there are still potential safety hazards. When the user forgets to adjust the rotation speed of the hand-held electric drill or adjusts it to the wrong speed, it is very easy to cause the lifting chain to rotate rapidly, thereby triggering an accident.

[0005] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0006] Based on this, this application provides a load-limiting hoist used in conjunction with a pistol drill to solve one of the above technical problems.

[0007] The technical solution adopted by this application to solve its technical problems includes: a housing, on which a connection groove is opened; a braking assembly, arranged inside the housing, including a braking bolt, a self-locking nut, a braking gear, a self-lubricating steel sleeve, a disc spring, a pressing piece, and a friction piece. The inner wall of the braking gear is provided with a self-lubricating steel sleeve, and friction pieces are arranged at both ends of the braking gear. The braking bolt is sequentially sleeved with the braking gear, the pressing piece, and the disc spring. The self-locking nut is screwed onto the front end of the braking bolt and abuts against one end of the disc spring; a long shaft, arranged at the central position of the braking assembly, for transmitting the power generated by the rotation of the braking gear; a gear shaft, rotatably arranged in the connection groove, for driving the braking gear, and at least a part of the gear shaft extends out of the housing and cooperates with the working head of the pistol drill; when the rotation speed of the braking gear exceeds the set rotation speed threshold, the disc spring will be compressed under pressure, so that the braking gear cannot drive the braking bolt and idles.

[0008] In some embodiments, a hoisting chain is further provided outside the housing. One end of the hoisting chain is provided with a hook for lifting heavy objects. The other end of the long shaft connected to the braking assembly is provided with a transmission gear for driving the hoisting chain.

[0009] In some embodiments, the front end of the braking bolt is a threaded section and is matched with the self-locking nut. A keyway is provided in the middle section of the braking bolt.

[0010] In some embodiments, the inner wall of the pressing piece is provided with a clamping protrusion, and the clamping protrusion is matched with the keyway.

[0011] In some embodiments, the pawl is matched with the ratchet, and the ratchet is coaxial with the braking assembly.

[0012] In some embodiments, the gear shaft meshes with the braking gear.

[0013] In some embodiments, the self-locking nut is used to adjust the pressure of the disc spring, thereby adjusting the rotational speed threshold of the braking gear.

[0014] The beneficial effects of the present application are as follows: The presence of the gear shaft enables the user to perform rapid hoisting only by using a conventional pistol drill to drive the gear shaft. At the same time, the hoist itself does not require electricity and can still be used in some environments without electricity or in harsh conditions, improving the convenience of use. To prevent the pistol drill from running at high speed due to the user's negligence, which may cause accidents, the present application is provided with a disc spring on the braking assembly. When the rotational speed of the braking gear exceeds the preset threshold, the disc spring will be compressed by the pressure caused by the high-speed rotation of the braking gear, and the braking gear will no longer affect the rotation of the long shaft and enter idling, effectively improving the safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 is a schematic diagram of the usage state of the present application.

[0017] Figure 2 is an exploded view of the braking assembly of the present application.

[0018] Figure 3 is a cross-sectional view of the load-limiting hoist of the present application.

[0019] Description of the attached reference numerals: 1. Housing; 11. Connecting groove; 2. Braking assembly; 21. Braking bolt; 211. Threaded section; 212. Keyway; 22. Self-locking nut; 23. Braking gear; 24. Self-lubricating steel sleeve; 25. Disc spring; 26. Pressing plate; 261. Clamping projection; 27. Friction plate; 3. Long shaft; 4. Gear shaft; 5. Lifting chain; 51. Hook; 6. Driving gear; 7. Locking device; 71. Ratchet; 72. Pawl. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of the technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope of the present application.

[0021] In the embodiments of the present application, please refer to Figures 1-3 As shown, the present application provides a load-limiting hoist for use with a pistol drill, mainly including: a housing 1, on which a connecting groove 11 is opened; a braking assembly 2, arranged inside the housing 1, including a braking bolt 21, a self-locking nut 22, a braking gear 23, a self-lubricating steel sleeve 24, a disc spring 25, a pressing plate 26, and a friction plate 27. A self-lubricating steel sleeve 24 is arranged on the inner wall of the braking gear 23, and friction plates 27 are arranged at both ends of the braking gear 23. The braking bolt 21 is sequentially sleeved with the braking gear 23, the pressing plate 26, and the disc spring 25. The self-locking nut 22 is screwed onto the front end of the braking bolt 21 and abuts against one end of the disc spring 25; a long shaft 3, arranged at the axial center position of the braking assembly 2, for transmitting the power generated by the rotation of the braking gear 23; a gear shaft 4, rotatably arranged in the connecting groove 11, for driving the braking gear 23, and at least a part of the gear shaft 4 extends out of the housing 1 and cooperates with the working head of the pistol drill; when the rotational speed of the braking gear 23 exceeds the set speed threshold, the disc spring 25 will be compressed under pressure, so that the braking gear 23 cannot drive the braking bolt 21 and idles.

[0022] Specifically, when driving the gear shaft 4 with a pistol drill, the rotation of the gear shaft 4 will drive the brake gear 23 to rotate synchronously. At normal speeds, the parts of the brake assembly 2 always maintain a compressed state, causing the entire brake assembly 2 to rotate, and then driving the long shaft 3 to rotate. When the speed of the pistol drill exceeds the set speed threshold, the brake gear 23 under high-speed rotation will compress the disc spring 25, causing the parts of the brake assembly 2 to no longer maintain a compressed state. The brake gear 23 will then enter an idling state, ensuring the safety of the usage state.

[0023] Next, some preferred / improved embodiments based on the above embodiments will be further described. Any one or a combination of multiple of the following embodiments can be selected.

[0024] Refer to Figure 1 As shown, in order to enable the hoist to lift heavy objects and provide transmission, a lifting chain 5 is further provided outside the housing 1. One end of the lifting chain 5 is provided with a hook 51 for lifting heavy objects. The other end of the long shaft 3 connected to the brake assembly 2 is provided with a transmission gear 6 for driving the lifting chain 5.

[0025] In order to enable the self-locking nut 22 to fix other parts of the brake assembly 2, so that the brake gear 23 can drive the entire brake assembly 2 to rotate, the front end of the brake bolt 21 is a threaded section 211 and is matched with the self-locking nut 22. A keyway 212 is provided in the middle section of the brake bolt 21.

[0026] Refer to Figure 2 As shown, the inner wall of the pressing piece 26 is provided with a clamping protrusion 261. The clamping protrusion 261 is matched with the keyway 212. With this setting, the pressing piece 26 can only slide up and down along the outer circumference of the brake bolt 21 and will not be driven to rotate by the brake gear 23.

[0027] Refer to Figure 3 As shown, a locking device 7 is further installed in the housing 1, including a ratchet wheel 71 and a pawl 72. The pawl 72 is matched with the ratchet wheel 71. The ratchet wheel 71 is coaxial with the brake assembly 2. With this setting, when the brake assembly 2 stops rotating, the pawl 72 will lock the ratchet wheel 71, preventing the long shaft 3 from reversing, and thus preventing the lifting chain 5 from descending.

[0028] Specifically, in order to enable the gear shaft 4 to drive the brake gear 23 and make the pistol drill a power source, the gear shaft 4 meshes with the brake gear 23.

[0029] Preferably, the self-locking nut 22 is used to adjust the pressure of the disc spring 25, and thus adjust the speed threshold of the brake gear 23. With this setting, the brake gear 23 can be adjusted by rotating the self-locking nut 22.

[0030] So far, various embodiments of the present application have been described in detail. To avoid obscuring the concept of the present application, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present application. The foregoing embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A load-limiting hoist used with a pistol drill, characterized in that: include: A shell body, on which a connecting groove is formed; A brake assembly is arranged inside the housing, and includes a brake bolt, a self-locking nut, a brake gear, a self-lubricating steel sleeve, a disc spring, a pressure plate, and a friction plate. The inner wall of the brake gear is provided with a self-lubricating steel sleeve, and friction plates are provided at both ends of the brake gear. The brake bolt is sleeved with the brake gear, the pressure plate, and the disc spring in sequence. The self-locking nut is screwed on the front end of the brake bolt and abuts against one end of the disc spring. A long shaft, arranged at the axis center of the brake assembly, for transmitting the power generated by the rotation of the brake gear; a gear shaft, rotatably disposed in the connecting groove, for driving the brake gear, at least a portion of the gear shaft extending out of the housing and cooperating with a working head of the pistol drill; When the brake gear exceeds a set rotation speed threshold, the disc spring is subjected to pressure and is compressed, so that the brake gear cannot drive the brake bolt and idles.

2. The load-limiting hoist used with a pistol drill according to claim 1, characterized in that: A lifting chain is also arranged outside the shell, one end of the lifting chain is provided with a hook for lifting heavy objects, and the other end of the long shaft connected to the brake assembly is provided with a transmission gear for driving the lifting chain.

3. The load-limiting hoist used with a pistol drill according to claim 1, characterized in that: The front end of the brake bolt is a threaded section and cooperates with the self-locking nut, and the middle section of the brake bolt is provided with a keyway.

4. The load-limiting hoist used with a pistol drill according to claim 3, characterized in that: The inner wall of the pressing sheet is provided with a locking protrusion, and the locking protrusion cooperates with the key groove.

5. The load-limiting hoist used with a pistol drill according to claim 1, characterized in that: A locking device is also installed in the housing, including a ratchet and a pawl, the pawl cooperates with the ratchet, and the ratchet is coaxial with the brake assembly.

6. The load-limiting hoist used with a pistol drill according to claim 1, characterized in that: The gear shaft meshes with the brake gear.

7. The load-limiting hoist used with a pistol drill according to claim 1, characterized in that: The self-locking nut is used to adjust the pressure of the disc spring, thereby adjusting the rotation speed threshold of the brake gear.

Images