Self-locking type hand-cranking lead screw

Abstract

The utility model belongs to the technical field of transmission parts, and particularly relates to a self-locking type hand-cranking screw rod which comprises a screw rod main body, a screw rod body and a screw rod body, a driving transmission shaft and a driven transmission shaft are arranged in the transmission box; the self-locking transmission connecting part is arranged between the rocking handle and the driving transmission shaft and is used for connecting the rocking handle and the driving transmission shaft; wherein the driven transmission shaft is in transmission connection with the screw rod main body, the driving transmission shaft and the driven transmission shaft are in meshing transmission through a gear, and the self-locking transmission connecting part can lock the reverse adjustment direction of the rocking handle after the rocking handle forwards adjusts the screw rod main body so as to prevent the screw rod main body from retreating. The use stability of the lead screw is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission parts, and in particular relates to a self-locking hand-cranked screw rod. Background Art

[0002] A screw is a long screw rod, usually made of metal material, with a series of thread notches, called threads. A hand-cranked screw rod is a simple, mechanized transmission device, commonly used in small mechanical equipment. It usually consists of a screw rod and a nut, and linear motion is achieved by manually rotating the screw rod. For example, a hand-cranked screw rod transmission structure for a standing position of a medical bed disclosed in the patent with application number CN201620397064.4 includes a longitudinal transmission part, which has a first transmission rod, a first bevel gear and a rotating crank, the first transmission rod is arranged longitudinally, the rotating crank is combined with the upper end of the first transmission rod, and the first bevel gear is combined with the lower end of the first transmission rod; and a transverse transmission part, which has a second transmission rod, a second bevel gear and a pushing screw rod, the second transmission rod is arranged transversely, the second bevel gear is combined with the first end of the second transmission rod, the second bevel gear is meshed with the first bevel gear, and the pushing screw rod is combined with the second end of the second transmission rod;

[0003] During use, this existing hand-cranked screw structure is prone to loosening and rotating in the force direction after adjustment, resulting in retreat. The stability of use is low, and the structural strength of the screw is poor. After long-term use, it is easy to break during adjustment, so it is necessary to make improvements. Utility Model Content

[0004] The purpose of the utility model is to provide a self-locking hand-cranked screw rod in view of the above-mentioned technical problems, so as to improve the use stability and service life of the hand-cranked screw rod.

[0005] In view of this, the utility model provides a self-locking hand-cranked screw rod, comprising:

[0006] A screw rod body, wherein the screw rod body is driven to rotate by a crank;

[0007] A transmission box, wherein a driving transmission shaft and a driven transmission shaft are arranged in the transmission box;

[0008] Also includes:

[0009] A self-locking transmission connection part, which is arranged between the crank and the active transmission shaft and is used to connect the crank and the active transmission shaft;

[0010] Among them, the driven transmission shaft is connected to the screw rod body, the active transmission shaft and the driven transmission shaft are transmitted through gear meshing, and the self-locking transmission connection part can lock the reverse adjustment direction of the crank handle after the crank handle adjusts the screw rod body in the forward direction to prevent the screw rod body from retreating.

[0011] In the present technical solution, through the setting of the self-locking transmission connection, during the operation of the hand-cranked screw, the crank handle drives the active transmission shaft to rotate through the self-locking transmission connection, and the driven transmission shaft drives the screw body to rotate as the active transmission shaft rotates, thereby adjusting the screw. After the adjustment is completed, the self-locking transmission connection can lock the crank handle, thereby preventing the screw from retreating, thereby improving the stability of the screw.

[0012] In the above technical solution, further, the self-locking transmission connection part also includes:

[0013] An outer connecting rod, wherein the inner end of the outer connecting rod has a transmission connecting shaft, and the transmission connecting shaft has a plurality of keys distributed along the circumferential direction;

[0014] An inner connecting rod, wherein the outer end of the inner connecting rod has an axial hole matched with the transmission connecting shaft, and the axial hole has a plurality of key grooves distributed along the circumferential direction;

[0015] A plurality of springs, wherein the plurality of springs are arranged between the outer connecting rod and the inner connecting rod and are evenly spaced and distributed along the circumference of the transmission connecting shaft;

[0016] An end face ratchet, the end face ratchet being arranged on the outer connecting rod;

[0017] Wherein, the inner connecting rod is connected to the active transmission shaft, the transmission box is provided with end face ratchet teeth cooperating with the end face ratchet wheel, and the transmission connection shaft is movably connected to the shaft hole.

[0018] In the above technical solution, further, the screw rod body also includes:

[0019] The oil storage tank is arranged at the center of the thread top of the screw rod body.

[0020] In the above technical solution, further, the screw rod body also includes:

[0021] A reinforcing core, wherein the reinforcing core is arranged in the screw rod body, and a reinforcing rod is arranged outside the reinforcing core;

[0022] An oblique rib, wherein the oblique rib is arranged between the reinforcing core and the reinforcing rod;

[0023] There are a plurality of reinforcing rods which are evenly spaced and distributed along the axial direction of the reinforcing core, and connecting rods are arranged between adjacent oblique ribs.

[0024] In the above technical solution, further, the surface of the screw rod body is coated with a lubricating and wear-resistant coating.

[0025] The beneficial effects of the utility model are:

[0026] 1. The self-locking transmission connection part can lock the crank handle, thereby preventing the screw rod from retreating and improving the stability of the screw rod;

[0027] 2. The structural strength of the screw body is improved by setting the reinforcing core, reinforcing rod, oblique ribs and connecting rod, which prevents the screw from breaking after long-term use and increases the service life of the screw;

[0028] 3. The setting of the oil storage tank ensures the stability of the screw rod lubrication effect, thereby reducing the wear of the screw rod, increasing the service life of the screw rod, and also improving the stability of the use of the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic structural diagram of a specific implementation method of the utility model.

[0031] Figure 2 This is a schematic diagram of the transmission box structure of the utility model.

[0032] Figure 3 This is a schematic diagram of the shaft hole structure of the utility model.

[0033] Figure 4 This is a schematic diagram of the transmission connecting shaft structure of the utility model.

[0034] Figure 5 This is a schematic diagram of the oil storage tank structure of the utility model.

[0035] Figure 6 This is a schematic diagram of the main structure of the screw rod of the utility model.

[0036] The symbols in the figure are:

[0037] 1. Screw body; 2. Crank handle; 3. Transmission box; 4. Active transmission shaft; 5. Driven transmission shaft; 6. Self-locking transmission connection; 60. External connecting rod; 61. Transmission connecting shaft; 62. Key; 63. Internal connecting rod; 64. Shaft hole; 65. Keyway; 66. Spring; 67. End face ratchet; 7. Gear; 8. Oil storage tank; 9. Strengthening core; 10. Strengthening rod; 11. Oblique rib; 12. Connecting rod; DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] Screw body and transmission box

[0041] This embodiment proposes an existing screw body and transmission box, in which the screw body 1 is driven to rotate by a crank 2; an active transmission shaft 4 and a driven transmission shaft 5 are provided in the transmission box 3; the driven transmission shaft 5 is transmission-connected to the screw body 1, and the active transmission shaft 4 and the driven transmission shaft 5 are meshed and transmitted by a gear 7, which can be a conventional bevel gear 7 or a bevel gear 7.

[0042] During the operation of the hand-cranked screw, the crank handle 2 drives the active transmission shaft 4 to rotate, and the driven transmission shaft 5 drives the screw body 1 to rotate as the active transmission shaft 4 rotates, thereby adjusting the screw.

[0043] Self-locking transmission connection

[0044] A self-locking transmission connection part 6, which is arranged between the crank handle 2 and the active transmission shaft 4 and is used to connect the crank handle 2 and the active transmission shaft 4;

[0045] The self-locking transmission connection part 6 also includes: an outer connecting rod 60, the inner end of the outer connecting rod 60 has a transmission connection shaft 61, and the transmission connection shaft 61 has a plurality of keys 62 distributed along the circumferential direction; an inner connecting rod 63, the outer end of the inner connecting rod 63 has an axial hole 64 that matches the transmission connection shaft 61, and the axial hole 64 has a plurality of key grooves 65 distributed along the circumferential direction; a plurality of springs 66, the plurality of springs 66 are arranged between the outer connecting rod 60 and the inner connecting rod 63 and are evenly spaced and distributed along the circumference of the transmission connection shaft 61; an end face ratchet 67, and the end face ratchet 67 is arranged on the outer connecting rod 60;

[0046] Among them, the self-locking transmission connection part 6 can lock the reverse adjustment direction of the crank handle 2 after the crank handle 2 adjusts the screw rod body 1 in the positive direction to prevent the screw rod body 1 from retreating. The inner connecting rod 63 is connected to the active transmission shaft 4, and the transmission box 3 is provided with an end face ratchet that cooperates with the end face ratchet 67, and the transmission connection shaft 61 is movably connected with the shaft hole 64.

[0047] The right end of the transmission box 3 has a hole for the outer connecting rod 60 and the inner connecting rod 63 to pass through. The inner connecting rod 63 is fixedly connected to the hole in the axial direction and rotationally connected in the circumferential direction. The crank handle 2 is fixedly connected to the outer end of the outer connecting rod 60, the end face ratchet 67 is coaxial with the outer connecting rod 60, one end of the spring 66 is fixedly connected to the outer connecting rod 60, and the other end is fixedly connected to the inner connecting rod 63.

[0048] When the screw rod body 1 is adjusted by the crank 2, the crank 2 is rotated forward. Since the outer connecting rod 60 and the inner connecting rod 63 are movably connected through the transmission connecting shaft 61 and the key 62, the outer connecting rod 60 and the inner connecting rod 63 can be transmitted while being retractable, and a pre-tightening force is formed by the spring 66. The end face ratchet 67 always cooperates with the end face ratchet teeth. When the crank 2 is rotated forward, the end face ratchet teeth will not limit the rotation of the end face ratchet 67, so that the crank 2 can drive the active transmission shaft 4 to rotate through the self-locking transmission connection part 6, thereby The dynamic transmission shaft 5 drives the screw body 1 to rotate as the active transmission shaft 4 rotates, thereby adjusting the screw. After the adjustment is completed, the end ratchet 67 cooperates with the end ratchet under the action of the spring 66 to limit the reverse rotation of the crank handle 2, thereby completing self-locking and preventing the screw from retreating, thereby improving the stability of the hand-cranked screw. When the screw needs to be reset, the crank handle 2 is pulled outward and the crank handle 2 is turned at the same time. At this time, the spring 66 is stretched, and the end ratchet 67 is separated from the end ratchet, so that the crank handle 2 is turned in the opposite direction to reset the screw.

[0049] Oil storage tank

[0050] The screw body further includes an oil storage tank 8 , which is arranged at the center of the top of the thread of the screw body 1 .

[0051] By setting the oil storage tank 8, a certain amount of semi-solid lubricating oil can be contained in the oil storage tank 8, so that the screw body 1 can maintain long-term lubrication during operation, ensuring the stability of the screw lubrication effect, thereby reducing the wear of the screw, increasing the service life of the screw, and also improving the stability of the use of the screw.

[0052] Reinforcement cores, reinforcing rods, diagonal ribs and connecting rods

[0053] The screw body further includes: a reinforcing core 9, which is arranged in the screw body 1, and a reinforcing rod 10 is arranged outside the reinforcing core 9; and an oblique rib 11, which is arranged between the reinforcing core 9 and the reinforcing rod 10.

[0054] There are a plurality of reinforcing rods 10 which are evenly spaced and distributed along the axial direction of the reinforcing core 9 , and connecting rods 12 are arranged between adjacent oblique ribs 11 .

[0055] The reinforcing rods 10 may also be evenly spaced and distributed along the circumference of the reinforcing core 9 .

[0056] The structural strength of the screw body 1 is improved by providing the reinforcing core 9, the reinforcing rod 10, the oblique ribs 11 and the connecting rod 12, thereby preventing the screw from breaking after long-term use and improving the service life of the screw.

[0057] Lubricating wear-resistant coating

[0058] The surface of the screw body is coated with a lubricating and wear-resistant coating.

[0059] The lubricating and wear-resistant coating is made of alloy element catalytic nickel plating or dried Teflon ETFE or molybdenum disulfide solid.

[0060] The provision of the lubricating and wear-resistant coating further improves the lubrication effect and wear resistance of the screw body 1, thereby reducing the wear of the screw, increasing the service life of the screw, and also improving the use stability of the screw.

[0061] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A self-locking hand-cranked screw, comprising: A screw rod body (1), wherein the screw rod body (1) is driven to rotate by a crank handle (2); A transmission box (3), wherein a driving transmission shaft (4) and a driven transmission shaft (5) are arranged in the transmission box (3); It is characterized by further comprising: A self-locking transmission connection portion (6), the self-locking transmission connection portion (6) being arranged between the crank handle (2) and the active transmission shaft (4) and used for connecting the crank handle (2) and the active transmission shaft (4); The driven transmission shaft (5) is in transmission connection with the screw body (1), the active transmission shaft (4) and the driven transmission shaft (5) are meshed and transmitted via a gear (7), and the self-locking transmission connection portion (6) is capable of locking the crank handle (2) in a reverse adjustment direction after the crank handle (2) has adjusted the screw body (1) in a forward direction, thereby preventing the screw body (1) from retreating; The self-locking transmission connection portion also includes: An external connecting rod (60), wherein the inner end of the external connecting rod (60) has a transmission connecting shaft (61), and the transmission connecting shaft (61) has a plurality of keys (62) distributed along the circumferential direction; An inner connecting rod (63), the outer end of the inner connecting rod (63) having an axial hole (64) that matches the transmission connecting shaft (61), and a plurality of key grooves (65) distributed along the circumferential direction on the axial hole (64); A plurality of springs (66), wherein the plurality of springs (66) are arranged between the outer connecting rod (60) and the inner connecting rod (63) and are evenly spaced and distributed along the circumference of the transmission connecting shaft (61); an end face ratchet (67), wherein the end face ratchet (67) is arranged on the outer connecting rod (60); The inner connecting rod (63) is connected to the active transmission shaft (4), the transmission box (3) is provided with end face ratchets that cooperate with the end face ratchet (67), and the transmission connection shaft (61) is movably connected to the shaft hole (64).

2. A self-locking hand-cranked screw according to claim 1, characterized in that: The screw rod body also includes: An oil storage tank (8) is arranged at the center of the top of the thread of the screw rod body (1).

3. A self-locking hand-cranked screw according to claim 2, characterized in that: The screw rod body also includes: A reinforcing core (9), the reinforcing core (9) being arranged in the screw rod body (1), and a reinforcing rod (10) being arranged outside the reinforcing core (9); An oblique rib (11), wherein the oblique rib (11) is arranged between the reinforcing core (9) and the reinforcing rod (10); There are a plurality of reinforcing rods (10) which are evenly spaced and distributed along the axial direction of the reinforcing core (9), and connecting rods (12) are provided between adjacent oblique ribs (11).

4. A self-locking hand-cranked screw according to claim 1, characterized in that: The surface of the screw rod body (1) is coated with a lubricating and wear-resistant coating.

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