Worm

Abstract

The utility model provides a worm, and belongs to the technical field of oil and gas pipeline accessories. The problem that an existing worm is unstable in transmission is solved. The worm comprises a worm body, worm teeth are arranged on the surface of the worm body, a through hole is formed in the center of the worm body, a chamfer is arranged on the inner wall of the through hole, and an inner spline is fixedly connected to the inner wall of the through hole. The internal spline of the worm is meshed with the external spline on the surface of the transmission part, so that the worm and the transmission part are tightly connected and do not slip, the transmission is safe, the joint of the supporting seat and the worm is reinforced and supported, the slip between the internal spline and the transmission part in the transmission process is avoided, and the transmission is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas pipeline accessories and relates to an accessory of an electronic actuator, in particular to a worm. Background Art

[0002] A worm is a gear with one or more spiral teeth that meshes with a worm wheel to form a staggered axis gear pair. Its pitch surface can be a cylindrical surface, a conical surface or a torus surface. There are four types: Archimedean worm, involute worm, normal straight worm, and conical envelope cylindrical worm.

[0003] For example, Chinese patent literature discloses a worm [application number: 202020382597.1; authorization announcement number: CN211778852U], which includes a cylindrical shaft body, an axial hole is provided in the center of the shaft body, the shaft body is installed on the drive shaft of the machine tool through the axial hole, and worm teeth are provided on the outer circumference of the shaft body, and the pitch of the worm teeth gradually increases; ratchet teeth are provided at the end of the shaft body, and the ratchet teeth are used to engage with the ratchet wheel; worm teeth are provided on the outer circumference of the shaft body, and the pitch of the worm teeth gradually increases from left to right. When the worm gear pair is worn during use, the adjustment gasket is thinned, and the worm is rotated by the square head to move the shaft body to the left a certain distance. Since the pitch of the worm gradually increases from left to right, the gap between the worm teeth of the worm and the worm gear pair is eliminated through axial adjustment. After adjustment, the nut is tightened to prevent the worm from moving axially.

[0004] When the above-mentioned worm is used, the transmission is smooth, but the shaft hole on the worm is sleeved on the transmission member, and the connection tightness between the worm and the transmission member is poor, which is prone to slippage, and in severe cases, causes simultaneous wear and damage of the transmission member and the worm. Summary of the invention

[0005] The purpose of the utility model is to provide a worm with good transmission stability in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a worm, including a worm body, the surface of the worm body is provided with worm teeth, a through hole is opened at the center of the worm body, the inner wall of the through hole is provided with a chamfer, and the inner wall of the through hole is fixedly connected with an internal spline. Through the worm teeth, through hole, chamfer and internal spline, the through hole is connected to an external transmission member, and the internal spline is meshed with the external spline on the surface of the transmission member, so that the worm and the transmission member can be tightly connected without slipping and safe transmission.

[0007] In the above-mentioned worm, the worm body comprises a supporting layer, the outer portion of the supporting layer is provided with a high temperature resistant layer, and the outer portion of the high temperature resistant layer is provided with a wear resistant layer.

[0008] In the above-mentioned worm, the material of the support layer is aluminum brass alloy, the material of the high temperature resistant layer is nickel-based alloy, and the material of the wear-resistant layer is carbon steel alloy. The support layer is made of aluminum brass alloy, which has high strength and hardness, good processing performance, and is easy to be processed into various shapes and sizes, thereby improving the support strength of the worm and making it difficult for the worm to deform. The high temperature resistant layer is made of nickel-based alloy, which has high strength, high toughness, excellent corrosion resistance and high temperature performance, thereby improving the high temperature resistance of the worm and making it difficult for the worm to deform when heated. The wear-resistant layer is made of carbon steel alloy, which has excellent wear resistance and can be used to manufacture high-strength and wear-resistant parts, and can maintain its stable performance for a long time, reduce wear and damage, and improve the wear resistance of the worm.

[0009] In the above-mentioned worm, a support seat is provided on the left side of the worm body, an annular groove is provided on the right side of the support seat, and the left side of the worm body extends to the inner cavity of the annular groove. The support seat and the annular groove facilitate connection with the worm.

[0010] In the above-mentioned worm, the top and bottom of the inner wall of the annular groove are both provided with a first keyway, the top and bottom of the worm body are both provided with a second keyway, the inner cavity of the first keyway is provided with a key block, and the key block extends from the side away from the first keyway to the inner cavity of the second keyway. The connection between the support seat and the worm is reinforced and supported by the first keyway, the second keyway and the key block, so as to avoid slipping between the internal spline and the transmission member during the transmission process, and make the transmission stable.

[0011] In the above-mentioned worm, the top and bottom of the inner cavity of the support seat are both provided with a third keyway. By providing the third keyway, the block can be connected to the transmission member, and the connection is stable.

[0012] Compared with the prior art, the advantages of this worm are as follows: the internal splines mesh with the external splines on the surface of the transmission part, which can make the worm and the transmission part tightly connected without slipping and ensure safe transmission. The connection between the support seat and the worm is reinforced to avoid slipping between the internal splines and the transmission part during transmission, making the transmission stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the worm.

[0014] Figure 2 For this worm Figure 1 A is an enlarged schematic diagram of the local structure.

[0015] Figure 3 This is a schematic diagram of the side view structure of the worm.

[0016] Figure 4 This is a partial cross-sectional schematic diagram of the supporting layer and high temperature resistant layer of the worm.

[0017] Figure 5 It is a schematic cross-sectional view of the support seat of the worm gear.

[0018] In the figure, 1, worm body; 110, supporting layer; 111, high temperature resistant layer; 112, wear-resistant layer; 2, worm teeth; 3, through hole; 4, chamfer; 5, internal spline; 6, supporting seat; 7, annular groove; 8, first keyway; 9, second keyway; 10, key block; 11, third keyway. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1 , Figure 2 Figure 3 , Figure 4 and Figure 5 As shown, the worm comprises a worm body 1, a worm tooth 2 is arranged on the surface of the worm body 1, a through hole 3 is opened at the center of the worm body 1, a chamfer 4 is arranged on the inner wall of the through hole 3, and an internal spline 5 is fixedly connected to the inner wall of the through hole 3.

[0021] During actual manufacturing, the worm body 1 comprises a supporting layer 110 , the supporting layer 110 is covered with a high temperature resistant layer 111 on its exterior, and the high temperature resistant layer 111 is covered with a wear resistant layer 112 on its exterior.

[0022] In actual manufacturing, the support layer 110 is made of aluminum brass alloy, the high temperature resistant layer 111 is made of nickel-based alloy, and the wear-resistant layer 112 is made of carbon steel alloy.

[0023] During actual manufacturing, a support seat 6 is provided on the left side of the worm body 1 , an annular groove 7 is provided on the right side of the support seat 6 , and the left side of the worm body 1 extends to the inner cavity of the annular groove 7 .

[0024] During actual manufacturing, a first keyway 8 is provided at the top and bottom of the inner wall of the annular groove 7, a second keyway 9 is provided at the top and bottom of the worm body 1, and a key block 10 is provided in the inner cavity of the first keyway 8. The key block 10 extends from one side away from the first keyway 8 to the inner cavity of the second keyway 9.

[0025] In actual manufacturing, the top and bottom of the inner cavity of the support seat 6 are both provided with a third key slot 11 .

[0026] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The specific embodiments described in this article are only used to illustrate the spirit of the utility model. The technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar way, but they will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A worm, comprising a worm body (1), characterized in that: The surface of the worm body (1) is provided with worm teeth (2); a through hole (3) is opened at the center of the worm body (1); the inner wall of the through hole (3) is provided with a chamfer (4); the inner wall of the through hole (3) is fixedly connected with an internal spline (5); the worm body (1) comprises a support layer (110); the outer sleeve of the support layer (110) is provided with a high temperature resistant layer (111); the outer sleeve of the high temperature resistant layer (111) is provided with a wear-resistant layer (112); the material of the support layer (110) is an aluminum brass alloy; the material of the high temperature resistant layer (111) is a nickel-based alloy; The wear-resistant layer (112) is made of a carbon steel alloy. A support seat (6) is provided on the left side of the worm body (1). An annular groove (7) is provided on the right side of the support seat (6). The left side of the worm body (1) extends to the inner cavity of the annular groove (7). The top and bottom of the inner wall of the annular groove (7) are provided with a first keyway (8). The top and bottom of the worm body (1) are provided with a second keyway (9). The inner cavity of the first keyway (8) is provided with a key block (10). The key block (10) extends from a side away from the first keyway (8) to the inner cavity of the second keyway (9).

2. A worm according to claim 1, characterized in that: A third keyway (11) is provided at the top and the bottom of the inner cavity of the support seat (6).

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