Coupling for fertilizer applicator and fertilizer applicator

Abstract

The utility model provides a coupler for a fertilizer applicator and the fertilizer applicator, and belongs to the technical field of agricultural instruments. The coupling solves the problem that when an existing coupling is used on a high-rotating-speed fertilizing machine, the service life is short. The coupler for the fertilizer applicator comprises a cylindrical body made of a rubber material and two connecting pieces located at the two ends of the body respectively, each connecting piece is a metal piece with a gear-ring-shaped protrusion formed on the peripheral wall of a cylindrical sleeve part, and the peripheral wall of the sleeve part and the protrusions are tightly wrapped by the body. And a hollow structure which is positioned between the two connecting pieces and is communicated with the inner hole of the sleeve part is also arranged in the body. The coupler has the advantage of being long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural machinery and relates to a coupling for a fertilizer spreader and the fertilizer spreader. Background Art

[0002] Fertilizer spreaders are common fluid conveying equipment in the agricultural sector. Currently, fertilizer spreaders generally consist of a pump body with a specific internal cavity, each with a liquid inlet and outlet. The pump body is equipped with a stator with a spiral inner wall and a rotating rotor with a helical rod. The rotor is inserted into the stator, forming a flow channel between the rotor and the stator. Rotation of the rotor creates a negative pressure in the flow channel, thereby drawing liquid from the pump body into the channel and ultimately discharging it through the pump body's outlet.

[0003] The coupling of a fertilizer spreader is a component used to connect the rotor and the drive shaft. For example, a Chinese patent document discloses a screw pump with an improved rubber stator (application number: 201420083374.X), which discloses a coupling structure commonly used in the market. It generally includes a body made of rubber material and two nuts respectively arranged at both ends of the body. The function of the nuts is to facilitate the connection of the coupling with the rotor and the drive shaft. During the high-speed operation of the fertilizer spreader, the drive shaft drives the rotor to rotate at high speed through the coupling. At this time, the coupling will be subjected to multiple external forces: first, the torsional force brought by the drive shaft; second, the liquid between the rotor and the stator will generate an axial force in the opposite direction on the rotor during the process of being transported to the outlet end, which in turn causes the connecting shaft to be subjected to an axial thrust; third, because the rotor is in the shape of a spiral rod, it will also generate a radial bias load on the coupling during its high-speed rotation. However, because the coupling is subjected to relatively complex external forces during the operation of the fertilizer spreader, the existing couplings generally have a short service life when used on high-speed fertilizer spreaders. Specifically,

[0004] 1. As mentioned above, during high-speed operation of a fertilizer spreader, the coupling is subjected to a variety of forces, including torsional force, axial thrust, and radial offset load. These forces can cause the rubber body in the coupling to deform. During this deformation, the molecular chains within the rubber undergo relative movement and friction, generating heat. Existing couplings are solid except for the nut mounting area. This structure makes it difficult for heat to dissipate, making the rubber body prone to localized overheating. This accelerates the aging and damage of the rubber material, ultimately resulting in a relatively short service life for the coupling when used on high-speed fertilizer spreaders.

[0005] 2. The nut on the coupling plays the role of transmitting torque. When the fertilizer spreader is running at high speed, the nut will be subjected to great torsional force. After long-term use, the existing coupling is prone to reduced connection stability between the nut and the rubber material body, causing the nut to loosen or even fall off, eventually leading to damage to the coupling and affecting its service life. Summary of the Invention

[0006] The purpose of the utility model is to solve the above problems in the existing technology and propose a coupling for a fertilizer spreader. The utility model solves the problem that the existing coupling has a short service life when used on a high-speed fertilizer spreader.

[0007] The purpose of the utility model can be achieved through the following technical solutions: A coupling for a fertilizer spreader, comprising a cylindrical body made of rubber material and two connecting pieces located at both ends of the body, characterized in that the connecting piece is a metal piece with a gear ring-shaped protrusion formed on the outer peripheral wall of a cylindrical sleeve part, the body tightly covers the outer peripheral wall of the sleeve part and the protrusion, and the body also has a hollow structure located between the two connecting pieces and connected to the inner hole of the sleeve part.

[0008] In this coupling, since a gear ring-shaped protrusion is formed on the outer peripheral wall of the sleeve portion of the connecting piece, and the main body of the rubber material tightly covers the outer peripheral wall of the sleeve portion and the protrusion, the rubber material of the main body can be embedded in the tooth groove of the protrusion, so that a very stable connection effect is formed between the connecting piece and the main body. In the process of the driving shaft driving the rotor to rotate at high speed, the connecting piece can stably transmit torque without slipping, loosening or even falling off. This can protect the main body of the rubber material and extend the service life of the coupling.

[0009] In addition, in this coupling, the two connecting parts are respectively arranged at the two ends of the body. At the same time, the body also has a hollow structure located between the two connecting parts and connected to the inner hole of the sleeve. In actual use, lubricating grease can be filled in the hollow structure. The lubricating grease is usually butter. The buffering properties of the lubricating grease can absorb vibration and impact, reduce the additional load on the coupling during high-speed operation, and reduce the heat generated by the load. At the same time, the hollow structure can increase the heat dissipation surface area. At the same time, with the help of the fluidity and thermal conductivity of the grease itself, the temperature inside the body can be better transmitted to the outside through the rotating shaft and the drive shaft, thereby effectively reducing the working temperature of the coupling, reducing material aging and performance degradation caused by overheating, and extending the service life of the coupling. In addition, due to the presence of the tooth ring-shaped protrusion on the connecting part, even if the outer wall of the connecting part adheres to the lubricating oil during the production process, it will not cause the connecting part to slip, so that the connecting part can stably transmit torque.

[0010] In the aforementioned coupling for a fertilizer spreader, the thickness of the protrusion along the axial direction of the sleeve portion is less than the length of the sleeve portion, and the protrusion is located in the middle of the sleeve portion. The longer sleeve portion ensures a larger connection area after the rotor and drive shaft are connected to the connector, thereby ensuring connection stability. The protrusion's location in the middle of the sleeve portion and its smaller thickness than the sleeve portion's length not only facilitates manufacturing but also reduces the amount of metal material used, thereby saving costs and reducing the weight of the coupling.

[0011] In the aforementioned coupling for a fertilizer spreader, the tooth groove surface of the tooth ring-shaped protrusion is a concave arc surface. This concave arc surface is easier to process and allows the molten rubber material to smoothly enter the tooth groove during the injection molding process, tightly and evenly filling the tooth groove after the rubber solidifies, thereby improving the connection stability between the connector and the body.

[0012] In the aforementioned coupling for a fertilizer spreader, the body has a central through-hole, with two connecting members disposed at the two end openings of the central through-hole. The central through-hole is located in the middle section between the two connecting members, forming the aforementioned hollow structure. This structure not only forms a hollow structure for filling with lubricating grease, but also allows lubricating grease to be added from one end of the central through-hole and completed all at once, thus facilitating installation of the coupling, the rotating shaft, and the drive shaft.

[0013] In the aforementioned coupling for a fertilizer spreader, the hollow structure comprises two symmetrically arranged central holes separated by a sheet-like partition integrally formed on the main body. The main body is injection molded in an injection mold. This structure not only forms a hollow structure for filling with lubricating grease, but also allows the use of two cores to form the two central holes during the molding process. This shortens the core length, making the core pulling process smoother and more convenient. Furthermore, a gap can be left between the two cores to prevent them from colliding. The gap forms the sheet-like partition integrally formed with the main body, which helps reduce the machining precision requirements of the injection mold and thus the mold cost.

[0014] In the aforementioned coupling for a fertilizer spreader, the diameter of the central through hole's middle section is smaller than the diameter of its two end openings. The inner circumferential walls of the two end openings of the central through hole each form a stepped surface with the inner circumferential wall of the central through hole's middle section. The inner end surface of the sleeve portion of the connector abuts against the adjacent stepped surfaces. The stepped surfaces provide axial positioning for the connector, thereby enhancing the stability of the connection between the connector and the main body.

[0015] In the aforementioned coupling for a fertilizer spreader, the sleeve portion is cylindrical, and the inner hole of the sleeve portion is a threaded hole. The cylindrical shape of the sleeve portion facilitates manufacturing. The internal threads formed on the inner circumferential wall of the sleeve portion facilitate connection between the coupling, the rotor, and the drive shaft.

[0016] In the above-mentioned coupling for a fertilizer spreader, the sleeve portion and the protrusion on its outer peripheral wall are an integrated structure, which is not only easy to process but also makes the connecting piece have a higher structural strength.

[0017] Compared with the prior art, the coupling for fertilizer spreader has the following advantages:

[0018] 1. In this coupling, since a gear ring-shaped protrusion is formed on the outer peripheral wall of the sleeve portion of the connecting member, and the outer peripheral wall of the sleeve portion and the protrusion are tightly covered by the main body of the rubber material, a very stable connection effect is formed between the connecting member and the main body. When the drive shaft drives the rotor to rotate at high speed, the connecting member can stably transmit torque, thereby extending the service life of the coupling.

[0019] 2. In this coupling, the main body has a hollow structure located between the two connecting parts and connected to the inner hole of the sleeve. By filling the hollow structure with lubricating grease, the operating temperature of the coupling can be effectively reduced, reducing material aging and performance degradation caused by overheating, and extending the service life of the coupling.

[0020] The purpose of the utility model is to solve the above problems in the existing technology and to propose a coupling for a fertilizer spreader to solve the problem of short service life of the coupling in the existing high-speed fertilizer spreader.

[0021] A fertilizer spreader includes a pump body, a coupling, a rotor and a drive shaft arranged in the pump body and coaxially with the rotor. The coupling includes a cylindrical body made of rubber material and two connecting pieces located at both ends of the body. The characteristic is that the connecting piece is a metal piece with a gear ring-shaped protrusion formed on the outer peripheral wall of the cylindrical sleeve portion, the body tightly covers the outer peripheral wall of the cylindrical sleeve portion and the protrusion, and the body also has a hollow structure located between the two connecting pieces and connected to the inner hole of the sleeve portion. One end of the rotor and one end of the drive shaft are respectively plugged and fixedly connected to the sleeve portions of the two connecting pieces.

[0022] In this fertilizer spreader, since a gear ring-shaped protrusion is formed on the connecting piece of the coupling, and the main body of the rubber material tightly covers the outer peripheral wall of the sleeve part and the protrusion, the rubber material of the main body can be embedded in the tooth groove of the protrusion, so that a very stable connection effect is formed between the connecting piece and the main body. In the process of the driving shaft driving the rotor to rotate at high speed, the connecting piece can stably transmit torque without slipping, loosening or even falling off. This can protect the main body of the rubber material and extend the service life of the coupling.

[0023] In addition, in this fertilizer spreader, the two connecting parts on the coupling are respectively arranged at the two ends of the body. At the same time, the body also has a hollow structure located between the two connecting parts and connected to the inner hole of the sleeve portion. In actual use, the hollow structure can be filled with lubricating grease. The lubricating grease is usually butter. The cushioning properties of the lubricating grease can absorb vibration and impact, reduce the additional load on the coupling during high-speed operation, and reduce the heat generated by the load. At the same time, the hollow structure can increase the heat dissipation surface area. At the same time, with the help of the fluidity and thermal conductivity of the grease itself, the temperature inside the body can be better transferred outward through the rotating shaft and the drive shaft, thereby effectively reducing the operating temperature of the coupling, reducing material aging and performance degradation caused by overheating, and extending the service life of the coupling. In addition, due to the presence of the tooth ring-shaped protrusion on the connecting part, even if the outer wall of the connecting part adheres to the lubricating grease during the manufacturing process, it will not cause the connecting part to slip, thereby enabling the connecting part to stably transmit torque.

[0024] Compared with the existing technology, this fertilizer spreader has the following advantages:

[0025] 1. In this fertilizer spreader, since a gear ring-shaped protrusion is formed on the connecting piece of the coupling, and the main body of the rubber material tightly covers the outer peripheral wall of the sleeve part and the protrusion, a very stable connection effect is formed between the connecting piece and the main body. When the drive shaft drives the rotor to rotate at high speed, the connecting piece can stably transmit torque, thereby extending the service life of the coupling.

[0026] 2. In this fertilizer spreader, since the coupling body has a hollow structure located between the two connecting parts and connected to the inner hole of the sleeve, filling the hollow structure with lubricating grease can effectively reduce the operating temperature of the coupling, reduce material aging and performance degradation caused by overheating, and extend the service life of the coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the fertilizer spreader in Example 1.

[0028] Figure 2 It is a cross-sectional view of the coupling in Example 1.

[0029] Figure 3It is a schematic diagram of the three-dimensional structure of the connecting part.

[0030] Figure 4 1 is a top view of the fertilizer spreader in Example 1.

[0031] Figure 5 yes Figure 4 Cross-sectional view of AA in the figure.

[0032] Figure 6 It is a cross-sectional view of the fertilizer spreader in Example 2.

[0033] Figure 7 It is a cross-sectional view of the coupling in Example 2.

[0034] In the figure, 1. main body; 1a. center through hole; 1b. lamellar partition; 1c. center hole; 1d. step surface; 1e. annular groove; 2. connecting part; 21. sleeve part; 22. protrusion; 3. pump body; 31. water inlet; 32. water outlet; 4. coupling; 5. rotor; 6. drive shaft; 7. stator; 8. pulley. DETAILED DESCRIPTION

[0035] 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.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, a coupling 4 for a fertilizer spreader comprises a cylindrical body 1 made of rubber material and two connecting pieces 2 located at both ends of the body 1. An annular groove 1e is provided in the middle of the outer peripheral wall of the body 1 along the circumferential direction. The connecting piece 2 is a metal piece formed by integrally forming a toothed ring-shaped protrusion 22 on the outer peripheral wall of a cylindrical sleeve 21. The inner hole of the sleeve 21 is a threaded hole. Figure 4 and 5 As shown, the body 1 tightly covers the outer circumferential wall of the sleeve portion 21 and the protrusion 22. The body 1 also has a hollow structure located between the two connectors 2 and connected to the inner hole of the sleeve portion 21. The body 1 is injection molded in an injection mold. During the injection molding process, the molten rubber material can smoothly enter the tooth groove. After the rubber solidifies, the body 1 tightly covers the outer circumferential wall of the sleeve portion 21 and the protrusion 22, improving the connection stability between the connector 2 and the body 1.

[0038] like Figure 2 and Figure 5 As shown, the thickness of the protrusion 22 along the axial direction of the sleeve portion 21 is smaller than the length of the sleeve portion 21, and the protrusion 22 is located in the middle of the sleeve portion 21, and the tooth groove surface of the tooth ring-shaped protrusion 22 is a concave arc surface.

[0039] like Figure 2 As shown, the main body 1 has a central through hole 1a, and two connecting parts 2 are respectively arranged at the openings at both ends of the central through hole 1a. The central through hole 1a is located in the middle section between the two connecting parts 2 to form a hollow structure. After the rotating shaft and the drive shaft 6 are connected through the coupling 4, a closed space is formed in the middle section of the central through hole 1a, so it can be filled with lubricating grease. The lubricating grease is usually butter. The buffering properties of the lubricating grease can absorb vibration and impact, reduce the additional load on the coupling 4 during high-speed operation, and reduce the heat generated by the load. At the same time, the hollow structure can increase the heat dissipation surface area. At the same time, with the help of the fluidity and thermal conductivity of the grease itself, the temperature inside the main body 1 can be better transferred to the outside through the rotating shaft and the drive shaft 6, thereby effectively reducing the operating temperature of the coupling 4, reducing material aging and performance degradation caused by overheating, and extending the service life of the coupling 4.

[0040] like Figure 2 As shown, the diameter of the middle section of the central through hole 1a is smaller than the diameter of the openings at both ends of the central through hole 1a. Step surfaces 1d are formed between the inner circumferential walls of the openings at both ends of the central through hole 1a and the inner circumferential wall of the middle section of the central through hole 1a. The inner end surface of the sleeve portion 21 of the connector 2 abuts against the adjacent step surfaces 1d. The step surfaces 1d provide abutment for the connector 2, providing an axial limit for the connector 2 and improving the stability of the connection between the connector 2 and the body 1.

[0041] Example 2

[0042] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 and Figure 7 As shown, the hollow structure comprises two symmetrically arranged central holes 1c separated by a sheet-like partition 1b integrally formed on the body 1. This structure allows two cores to be used to form the two central holes 1c during the molding process. This shortens the core length, making the core pulling process smoother and more convenient. Furthermore, a gap can be left between the two cores to prevent them from colliding with each other. The gap forms the sheet-like partition 1b integrally formed with the body 1, which helps reduce the machining precision requirements of the injection mold and thus reduces mold costs.

[0043] Example 3

[0044] A fertilizer spreader, including the coupling 4 of embodiment 1 or embodiment 2, specifically, the fertilizer spreader includes a pump body 3, a coupling 4, a spiral-shaped rotor 5, and a drive shaft 6 rotatably arranged in the pump body 3 and coaxially arranged with the rotor 5. The pump body 3 has a water inlet 31 and a water outlet 32. A spiral-shaped stator 7 is fixedly arranged in the pump body 3. The rotor 5 is inserted into the stator 7. The coupling 4 includes a cylindrical body 1 made of rubber material and two connecting members 2 respectively located at both ends of the body 1. The connecting member 2 is a cylindrical sleeve portion 21 with a gear ring formed on the outer peripheral wall thereof. The main body 1 tightly covers the outer peripheral wall of the cylindrical sleeve portion 21 and the protrusion 22. The main body 1 also has a hollow structure located between the two connecting parts 2 and connected to the inner hole of the sleeve portion 21. One end of the rotor 5 and one end of the drive shaft 6 are respectively threadedly connected to the sleeve portions 21 of the two connecting parts 2. The other end of the drive shaft 6 extends out of the pump body 3 and is connected to the pulley 8. The motor or engine is connected to the pulley 8 through a belt, and the drive shaft 6 and the rotor 5 can be driven by the motor or engine to rotate to realize the operation of the fertilizer spreader.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0046] Although this document frequently uses terms such as 1. body; 1a. central through hole; 1b. sheet-shaped partition; 1c. central hole; 1d. stepped surface; 1e. annular groove; 2. connector; 21. sleeve portion; 22. protrusion; 3. pump body; 31. water inlet; 32. water outlet; 4. coupling; 5. rotor; 6. drive shaft; 7. stator, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A coupling for a fertilizer spreader, comprising a cylindrical body (1) made of rubber material and two connecting pieces (2) located at both ends of the body (1), characterized in that: The connecting member (2) is a metal member having a tooth ring-shaped protrusion (22) formed on the outer peripheral wall of a cylindrical sleeve portion (21); the main body (1) tightly covers the outer peripheral wall of the sleeve portion (21) and the protrusion (22); and the main body (1) also has a hollow structure located between the two connecting members (2) and connected to the inner hole of the sleeve portion (21).

2. The coupling for a fertilizer spreader according to claim 1, characterized in that: The thickness of the protrusion (22) along the axial direction of the sleeve portion (21) is smaller than the length of the sleeve portion (21), and the protrusion (22) is located in the middle of the sleeve portion (21).

3. The coupling for a fertilizer spreader according to claim 1, characterized in that: The tooth groove surface of the tooth ring-shaped protrusion (22) is an inwardly concave arc surface.

4. The coupling for a fertilizer spreader according to claim 1, characterized in that: The body (1) has a central through hole (1a), and two connecting pieces (2) are respectively arranged at the openings at both ends of the central through hole (1a). The central through hole (1a) is located in the middle section between the two connecting pieces (2) to form the hollow structure.

5. The coupling for a fertilizer spreader according to claim 1, characterized in that: The hollow structure comprises two central holes (1c) that are symmetrically arranged and separated by a sheet-shaped partition (1b) integrally formed on the body (1).

6. The coupling for a fertilizer spreader according to claim 4, characterized in that: The aperture of the middle section of the central through hole (1a) is smaller than the aperture of the openings at both ends of the central through hole (1a), and step surfaces (1d) are formed between the inner peripheral walls of the openings at both ends of the central through hole (1a) and the inner peripheral wall of the middle section of the central through hole (1a), and the inner end surface of the sleeve portion (21) of the connecting member (2) abuts against the adjacent step surfaces (1d).

7. The coupling for a fertilizer spreader according to claim 1, characterized in that: The sleeve portion (21) is cylindrical, and the inner hole of the sleeve portion (21) is a threaded hole.

8. The coupling for a fertilizer spreader according to claim 1, characterized in that: The sleeve portion (21) and the protrusion (22) on its outer peripheral wall are an integrated structure.

9. A fertilizer spreader, comprising a pump body (3), a coupling (4), a rotor (5), and a drive shaft (6) disposed in the pump body (3) and coaxially disposed with the rotor (5), wherein the coupling (4) comprises a cylindrical body (1) made of rubber material and two connecting members (2) located at both ends of the body (1), characterized in that: The connecting member (2) is a metal member having a tooth ring-shaped protrusion (22) formed on the outer peripheral wall of a cylindrical sleeve portion (21); the main body (1) tightly covers the outer peripheral wall of the cylindrical sleeve portion (21) and the protrusion (22); the main body (1) also has a hollow structure located between the two connecting members (2) and connected to the inner hole of the sleeve portion (21); one end of the rotor (5) and one end of the drive shaft (6) are respectively plugged and fixedly connected to the sleeve portions (21) of the two connecting members (2).

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