Precise screw assembly

Abstract

The utility model relates to the technical field of precise screw assemblies, in particular to a precise screw assembly which comprises a dispensing valve cylinder, a cover block is fixedly connected to one end of the dispensing valve cylinder, a screw is rotatably connected to the inner wall of the cover block, and a glue outlet cylinder is fixedly connected to the inner wall of the dispensing valve cylinder; the protection mechanism is arranged on the surface of the screw rod; the protection mechanism comprises a first sealing ring and a second sealing ring which are fixedly connected to the inner wall of the dispensing valve cylinder. According to the device, the first sealing ring and the second sealing ring which are fluororubber components are utilized, so that the first sealing ring and the second sealing ring have good high-temperature resistance and wear resistance, and the first sealing ring and the second sealing ring always keep proper pressure on the screw rod by utilizing the spring; therefore, deformation and abrasion of the first sealing ring and the second sealing ring are reduced, the service life of the first sealing ring and the second sealing ring is prolonged, and the frequency of replacing the first sealing ring and the second sealing ring is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of precision screw assemblies, and particularly relates to a precision screw assembly. Background Art

[0002] A precision screw assembly generally refers to a mechanical part with a cylindrical body having longitudinal protrusions with helical lines, mainly used for connecting and fixing two objects. The function of the screw is to realize functions such as fixing, connecting, and component assembly through the interaction between its helical lines and mating parts (such as nuts). When the precision screw assembly is in the dispensing operation, in order to prevent the glue from leaking to the outside of the screw, a sealing ring is usually added to effectively prevent the glue from leaking and keep the equipment clean and running normally.

[0003] After retrieval, the Chinese patent "Precision Screw Valve Structure" with the authorization announcement number "CN206723462U" prevents the glue from staying in the dispensing valve during the dispensing process through the sealing ring and the connecting seat, has good sealing performance, and is convenient for maintenance.

[0004] The above-mentioned precision screw valve will encounter relatively high pressure during the dispensing process, and the screw will rotate frequently inside the sealing ring during dispensing, resulting in continuous friction between the sealing ring and the screw, which is likely to cause serious wear of the sealing ring.

[0005] Therefore, a precision screw assembly is proposed to solve the above problems. Content of the Utility Model

[0006] The purpose of the utility model is to provide a precision screw assembly to solve the above problems, and improve the problem that the continuous friction between the sealing ring and the screw is likely to cause serious wear of the sealing ring.

[0007] The utility model realizes the above purpose through the following technical solutions. A precision screw assembly includes: a dispensing valve barrel, one end of the dispensing valve barrel is fixedly connected with a cover block, the inner wall of the cover block is rotatably connected with a screw, and the inner wall of the dispensing valve barrel is fixedly connected with a glue outlet barrel; a protection mechanism, the protection mechanism is arranged on the surface of the screw; wherein, the protection mechanism includes a first sealing ring and a second sealing ring fixedly connected to the inner wall of the dispensing valve barrel, the surface of the screw is respectively in contact with the inner sides of the first sealing ring and the second sealing ring, a spring is fixedly connected between the opposite ends of the first sealing ring and the second sealing ring, and both the first sealing ring and the second sealing ring are fluororubber components. By using the first sealing ring and the second sealing ring which are fluororubber components, it is realized that the first sealing ring and the second sealing ring have good high temperature resistance and wear resistance. By using the spring, it is realized that the first sealing ring and the second sealing ring always maintain an appropriate pressure on the screw, thereby reducing the deformation and wear of the first sealing ring and the first sealing ring, improving the service life of the first sealing ring and the second sealing ring, and reducing the frequency of replacing the first sealing ring and the second sealing ring.

[0008] Preferably, a protective sleeve is fixedly connected between the opposite ends of the first sealing ring and the second sealing ring. The spring is located inside the protective sleeve, and the protective sleeve is a fluororubber member. The protective sleeve made of fluororubber member protects the spring and enables the first sealing ring and the second sealing ring to always maintain an appropriate pressure on the screw rod, thereby reducing the wear of the spring, the first sealing ring and the second sealing ring.

[0009] Preferably, lubricating grooves are formed inside the screw rod, and first oil outlet holes and second oil outlet holes are formed on the surface of the screw rod. The lubricating grooves are respectively communicated with the first oil outlet holes and the second oil outlet holes.

[0010] Preferably, an oil inlet pipe is fixedly connected to the upper end of the surface of the screw rod, and the bottom end of the oil inlet pipe is communicated with the lubricating groove. By using the oil inlet pipe, the lubricating groove, the first oil outlet hole and the second oil outlet hole, lubricating oil is applied between the screw rod and the first sealing ring and the second sealing ring, thereby reducing the friction between the screw rod and the first sealing ring and the second sealing ring, and thus reducing the wear of the first sealing ring and the second sealing ring.

[0011] Preferably, a sealing block is threadedly connected to the top end of the oil inlet pipe, and the sealing block is a polytetrafluoroethylene member. By using the sealing block, the oil inlet end of the oil inlet pipe is sealed, preventing impurities from entering the lubricating groove through the oil inlet end of the oil inlet pipe when oil is not being poured.

[0012] Preferably, the lower end of the surface of the oil inlet pipe forms an angle with the horizontal plane, and the lower end of the surface of the lubricating groove forms an angle with the horizontal plane.

[0013] Preferably, the inner walls of the first oil outlet hole and the second oil outlet hole are recessed in a funnel shape, and the diameter of the first oil outlet hole is smaller than that of the second oil outlet hole.

[0014] The beneficial effects of the present utility model are as follows:

[0015] By using the first sealing ring and the second sealing ring made of fluororubber member, the first sealing ring and the second sealing ring have good high temperature resistance and wear resistance. By using the spring, the first sealing ring and the second sealing ring always maintain an appropriate pressure on the screw rod, thereby reducing the deformation and wear of the first sealing ring and the first sealing ring, improving the service life of the first sealing ring and the second sealing ring, and reducing the frequency of replacing the first sealing ring and the second sealing ring;

[0016] By using the protective sleeve made of fluororubber member, the spring is protected and the first sealing ring and the second sealing ring always maintain an appropriate pressure on the screw rod, thereby reducing the wear of the spring, the first sealing ring and the second sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 Exploded view of the dispensing valve barrel and the cover block of the present utility model;

[0019] Figure 3 Schematic diagram of the structure of the protection mechanism of the present utility model;

[0020] Figure 4 is Figure 3 Enlarged view of A in

[0021] In the figure: 1, dispensing valve barrel; 2, glue outlet barrel; 3, screw; 4, cover block; 5, protection mechanism; 51, first sealing ring; 52, second sealing ring; 53, spring; 54, protection sleeve; 55, lubricating groove; 56, first oil outlet hole; 57, second oil outlet hole; 58, oil inlet pipe; 59, sealing block. Specific implementation mode

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0023] During specific implementation: As Figures 1-4 shown, a precision screw assembly includes: a dispensing valve barrel 1, one end of the dispensing valve barrel 1 is fixedly connected with a cover block 4, the inner wall of the cover block 4 is rotatably connected with a screw 3, and the inner wall of the dispensing valve barrel 1 is fixedly connected with a glue outlet barrel 2; a protection mechanism 5, the protection mechanism 5 is arranged on the surface of the screw 3; wherein, the protection mechanism 5 includes a first sealing ring 51 and a second sealing ring 52 fixedly connected to the inner wall of the dispensing valve barrel 1, the surface of the screw 3 is respectively in contact with the inner sides of the first sealing ring 51 and the second sealing ring 52, a spring 53 is fixedly connected between the opposite ends of the first sealing ring 51 and the second sealing ring 52, both the first sealing ring 51 and the second sealing ring 52 are fluororubber components, a protection sleeve 54 is fixedly connected between the opposite ends of the first sealing ring 51 and the second sealing ring 52, the spring 53 is located inside the protection sleeve 54, and the protection sleeve 54 is a fluororubber component.

[0024] In dispensing, the output shaft of the motor is connected to one end of the screw 3. The glue inlet pipe on the dispensing valve barrel 1 is connected to the corresponding pipeline. Manually turn on the power switch of the motor and convey glue into the dispensing valve barrel 1. The rotation of the output shaft of the motor drives the screw 3 to rotate in the glue outlet barrel 2. The glue in the dispensing valve barrel 1 is conveyed into the glue outlet barrel 2. The rotation of the screw 3 sends the glue out from the lower end outlet of the glue outlet barrel 2 to the processing position. After dispensing is completed, the power switch of the motor can be manually turned off and the conveyance of glue into the dispensing valve barrel 1 can be stopped. Since both the first sealing ring 51 and the second sealing ring 52 are fluororubber components, the first sealing ring 51 and the second sealing ring 52 have good elasticity, high temperature resistance and wear resistance, and can withstand the friction and wear during the movement of the screw 3. The spring 53 and the protective sleeve 54 between the first sealing ring 51 and the second sealing ring 52 make the forces on the first sealing ring 51 and the second sealing ring 52 uniform, reducing the wear degree of the first sealing ring 51 and the second sealing ring 52.

[0025] As Figure 4 shown, a lubricating groove 55 is provided inside the screw 3. First oil outlet holes 56 and second oil outlet holes 57 are provided on the surface of the screw 3. The lubricating groove 55 is respectively communicated with the first oil outlet hole 56 and the second oil outlet hole 57. The upper end of the surface of the screw 3 is fixedly connected with an oil inlet pipe 58. The bottom end of the oil inlet pipe 58 is communicated with the lubricating groove 55. The top end of the oil inlet pipe 58 is threadedly connected with a sealing block 59. The sealing block 59 is a polytetrafluoroethylene component. The lower end of the surface of the oil inlet pipe 58 forms an angle with the horizontal plane. The lower end of the surface of the lubricating groove 55 forms an angle with the horizontal plane. The inner walls of the first oil outlet hole 56 and the second oil outlet hole 57 are recessed in a funnel shape. The diameter of the first oil outlet hole 56 is smaller than the diameter of the second oil outlet hole 57.

[0026] When it is necessary to lubricate the screw 3, the first sealing ring 51 and the second sealing ring 52, rotate the sealing block 59 to open the oil inlet end of the oil inlet pipe 58, pour lubricating oil into the oil inlet pipe 58. The lubricating oil flows in the lubricating groove 55. Since the lubricating groove 55 is inclined downward, both the first oil outlet hole 56 and the second oil outlet hole 57 are in a funnel shape, and the diameter of the first oil outlet hole 56 is smaller than the diameter of the second oil outlet hole 57, the lubricating oil in the lubricating groove 55 quickly flows into the first oil outlet hole 56 and the second oil outlet hole 57. The lubricating oil flowing out of the first oil outlet hole 56 flows between the second sealing ring 52 and the screw 3, and the lubricating oil flowing out of the first oil outlet hole 56 flows between the first sealing ring 51 and the screw 3, reducing the friction between the screw 3 and the first sealing ring 51 and the second sealing ring 52.

[0027] When the utility model is in use, rotate the sealing block 59 to open the oil inlet end of the oil inlet pipe 58, pour lubricating oil into the oil inlet pipe 58, and the lubricating oil flows into the space between the second sealing ring 52 and the screw rod 3 and between the first sealing ring 51 and the screw rod 3 through the lubricating groove 55, the first oil outlet hole 56 and the second oil outlet hole 57. Connect the output shaft of the motor to one end of the screw rod 3, connect the glue inlet pipe on the dispensing valve barrel 1 to the corresponding pipeline, manually turn on the power switch of the motor and convey glue into the dispensing valve barrel 1. The rotation of the output shaft of the motor drives the screw rod 3 to rotate in the glue outlet barrel 2, the glue in the dispensing valve barrel 1 is conveyed into the glue outlet barrel 2, and the screw rod 3 rotates to send the glue out from the lower outlet of the glue outlet barrel 2 to the processing position. Since both the first sealing ring 51 and the second sealing ring 52 are made of fluororubber components, the first sealing ring 51 and the second sealing ring 52 have good elasticity, high temperature resistance and wear resistance, and can withstand the friction and wear during the movement of the screw rod 3. The spring 53 and the protective sleeve 54 between the first sealing ring 51 and the second sealing ring 52 make the forces on the first sealing ring 51 and the second sealing ring 52 uniform, reducing the wear degree of the first sealing ring 51 and the second sealing ring 52.

[0028] It should be noted that the dispensing valve barrel 1, the glue outlet barrel 2, the screw rod 3, etc. in the above description are all devices with relatively mature applications in the prior art, and specific models can be selected according to actual needs, which will not be elaborated here.

[0029] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precision screw assembly, characterized in that: include: A dispensing valve barrel (1), one end of the dispensing valve barrel (1) being fixedly connected to a cover block (4), an inner wall of the cover block (4) being rotatably connected to a screw rod (3), and an inner wall of the dispensing valve barrel (1) being fixedly connected to a dispensing barrel (2); A protection mechanism (5), wherein the protection mechanism (5) is arranged on the surface of the screw rod (3); The protection mechanism (5) comprises a first sealing ring (51) and a second sealing ring (52) fixedly connected to the inner wall of the dispensing valve cylinder (1); the surface of the screw rod (3) contacts the inner sides of the first sealing ring (51) and the second sealing ring (52), respectively; a spring (53) is fixedly connected between the opposite ends of the first sealing ring (51) and the second sealing ring (52); and the first sealing ring (51) and the second sealing ring (52) are both fluororubber components.

2. A precision screw assembly according to claim 1, characterized in that: A protective sleeve (54) is fixedly connected between the opposite ends of the first sealing ring (51) and the second sealing ring (52); the spring (53) is located inside the protective sleeve (54); and the protective sleeve (54) is a fluororubber component.

3. A precision screw assembly according to claim 1, characterized in that: A lubrication groove (55) is provided inside the screw rod (3), a first oil outlet hole (56) and a second oil outlet hole (57) are provided on the surface of the screw rod (3), and the lubrication groove (55) is respectively connected to the first oil outlet hole (56) and the second oil outlet hole (57).

4. A precision screw assembly according to claim 3, characterized in that: An oil inlet pipe (58) is fixedly connected to the upper end of the surface of the screw rod (3), and the lower end of the oil inlet pipe (58) is in communication with the lubrication groove (55).

5. A precision screw assembly according to claim 4, characterized in that: The top end of the oil inlet pipe (58) is threadedly connected to a sealing block (59), and the sealing block (59) is a polytetrafluoroethylene component.

6. A precision screw assembly according to claim 4, characterized in that: The lower end of the surface of the oil inlet pipe (58) forms an angle with the horizontal plane, and the lower end of the surface of the lubrication groove (55) forms an angle with the horizontal plane.

7. A precision screw assembly according to claim 3, characterized in that: The inner walls of the first oil outlet hole (56) and the second oil outlet hole (57) are concave in a funnel shape, and the diameter of the first oil outlet hole (56) is smaller than the diameter of the second oil outlet hole (57).

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