A sand mill rotary joint that isolates the material from contact with the sealing ring and its application

Abstract

The present invention relates to a rotary joint for a sand mill that isolates the contact between the material and the sealing ring and its application, comprising a housing and a rotary joint rotating shaft, a dynamic sealing ring, a static sealing ring, a fixing block, a spring and a discharge pipe located inside the housing; the dynamic sealing ring is arranged at the top end of the rotary joint rotating shaft, the static sealing ring is arranged at the bottom end of the fixing block, and the static sealing ring and the dynamic sealing ring are pressed tightly by the spring. The discharge pipe is inserted into the housing and penetrates through the spring, the fixing block, the static sealing ring, the dynamic sealing ring and the rotary joint rotating shaft and then extends into the sand mill rotating shaft. For the rotary joint of the sand mill of the present invention, the discharge pipe passes through the sealing ring, isolating the super-hard material from contacting the sealing ring, preventing the sealing ring from being worn by the hard particles in the material, greatly prolonging the service life of the rotary joint, improving the production efficiency and reducing the production cost.

Description

Technical Field

[0001] The present invention relates to a rotary joint for a sand mill that isolates the material from contact with the sealing ring and its application, belonging to the technical field of sand mills. Background Art

[0002] The sand mill is currently the most versatile, advanced, and efficient grinding equipment for materials. It has the narrowest grinding chamber, the smallest gap between the stirring rods, the most intensive grinding energy, and is equipped with a high-performance cooling system and an automatic control system. It can achieve continuous processing and continuous discharging of materials, greatly improving production efficiency.

[0003] The sand mill is mainly used for wet grinding of chemical liquid products. Generally, it can be divided into horizontal sand mills, basket sand mills, vertical sand mills, etc. It mainly consists of a machine body, a grinding cylinder, a sand grinding disc (stirring rod), grinding media, a motor, and a feeding pump. The feeding speed is controlled by the feeding pump. The grinding media of this equipment are generally divided into zirconia beads, glass beads, zirconium silicate beads, etc.

[0004] The sand mill adopts a disc type or rod pin type and a closed inner cavity design. The grinding discs are installed on the stirring shaft in a certain order, overcoming the disadvantages of uneven distribution of grinding media and poor particle size distribution after grinding in traditional horizontal sand mills. The material enters the grinding chamber under the action of the feeding pump. The inlet is designed at one end of the driving connection flange. The flow direction of the material is opposite to that of the mechanical bearing at the bottom end, greatly reducing the pressure borne by the mechanical seal and extending its service life. During the high-speed rotation of the eccentric disc on the stirring shaft, the mixture of the material and the grinding media undergoes an efficient relative movement. As a result, the solid particles of the material are effectively dispersed, sheared, and ground. After passing through the dynamic large-flow rotor gap separation filter, the final product is obtained. Depending on the grinding process of the product, independent batch cycle grinding or series grinding processes can be adopted.

[0005] For example, Chinese Patent Document CN104226426A discloses a full-size dynamic separation nano sand mill, which includes an outer barrel and a horizontal main shaft driven by a motor to rotate. An inner barrel with a grinding chamber is arranged inside the outer barrel. An outlet chamber is formed between the inner wall of the outer barrel and the outer wall of the inner barrel. The main shaft penetrates one side of the inner barrel and is connected to a rotor arranged in the grinding chamber. The other side of the inner barrel is provided with a feeding port communicating with the grinding chamber. The grinding chamber communicates with the outlet chamber through several separation slits arranged on the inner barrel. An outlet port communicating with the outlet chamber is opened on the outer barrel. The present invention uses the inner barrel to separate the material, and the rotor is directly installed in the separator, which not only saves space but also improves the discharging speed. Compared with traditional sand mills with a separate separator installed or the separator installed in the rotor, it provides a new discharging method and greatly improves the discharging efficiency.

[0006] For another example, Chinese Patent Document CN201516358U discloses a grinding medium intercepting device for a sand mill, belonging to a separating device, including a separating impeller fixedly installed on the grinding shaft of the sand mill and located inside the sand grinding barrel of the sand mill; a sealing ring fixedly installed on the upper end cover of the sand mill and surrounding the outer peripheral surface of the end of the separating impeller, with an annular gap provided between the sealing ring and the end of the separating impeller; and an overflow pipe fixedly installed on the upper end cover and extending into the inner cavity of the separating impeller. It solves the technical problems that it is difficult to separate the grinding medium of the sand mill from the slurry being ground and the production efficiency is low. The structure of the present utility model is reasonable and is widely applied to sand mills.

[0007] However, during the use of current sand mills, vertical sand mills are mostly used for the wet grinding of superhard materials such as silicon carbide and boron nitride, and a rotary joint is used to suck materials from the top. Although the sealing rings of the rotary joints are mostly made of superhard materials such as silicon carbide, due to the too high hardness of the materials, when the materials come into contact with the sealing rings, the service life of the rotary joints is too short and the grinding cost is relatively high. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the present invention provides a sand mill rotary joint that isolates the contact between the material and the sealing ring, and this sand mill rotary joint can effectively isolate the contact between the material and the sealing ring.

[0009] The present invention also provides an installation method for a sand mill rotary joint that isolates the contact between the material and the sealing ring.

[0010] The technical solution of the present invention is as follows:

[0011] A sand mill rotary joint that isolates the contact between the material and the sealing ring includes a housing and a rotary joint rotary shaft, a dynamic sealing ring, a static sealing ring, a fixing block, a spring and a discharge pipe located inside the housing;

[0012] The dynamic sealing ring is arranged at the top end of the rotary joint rotary shaft, the static sealing ring is arranged at the bottom end of the fixing block, and the static sealing ring and the dynamic sealing ring are pressed tightly by a spring. The discharge pipe is inserted into the housing and passes through the spring, the fixing block, the static sealing ring, the dynamic sealing ring, and the rotary joint rotary shaft and then extends into the sand mill rotary shaft.

[0013] Preferably, the dynamic sealing ring is adhered to the top end of the rotary joint rotary shaft with glue.

[0014] Preferably, the static sealing ring is adhered to the bottom end of the fixing block with glue.

[0015] Preferably, the bottom end of the rotary joint rotary shaft extends out of the housing, and the bottom end of the rotary joint rotary shaft and the top end of the sand mill rotary shaft are fixedly connected by bolts.

[0016] Preferably, a groove for accommodating a spring is provided at the top of the inner cavity of the housing. The fixing block is a T-shaped block. The small end of the fixing block extends into the groove and is fixed with a pin. Under the action of the spring, the fixing block can only slide up and down along the groove.

[0017] Preferably, a sealing ring is provided between the fixing block and the housing.

[0018] Preferably, the spring is a disc spring.

[0019] A sand mill includes a grinding cylinder, a sand mill rotor, a sand mill stator, a sand mill rotating shaft, and a sand mill rotating joint for isolating the material from contacting the sealing ring according to any one of the above; wherein, the sand mill rotor and the sand mill stator are cooperatively installed in the grinding cylinder. The sand mill rotor is connected to the sand mill rotating shaft, and the top end of the sand mill rotating shaft is fixedly connected to the bottom end of the rotating joint rotating shaft.

[0020] When the sand mill is working, the material in the grinding cylinder is extracted through the discharge pipe of the rotating joint. The liquid level of the material in the sand mill rotating shaft is slightly higher than the feed inlet of the discharge pipe under the action of negative pressure, and the material forms an air isolation layer between the sealing ring of the rotating joint and the liquid level of the material under the action of gravity, isolating the material from contacting the sealing ring.

[0021] An installation method of a sand mill rotating joint for isolating the material from contacting the sealing ring, which installs the sand mill rotating joint on the sand mill, includes the following steps:

[0022] (1) Install the dynamic sealing ring at the top end of the rotating joint rotating shaft, and install the static sealing ring at the bottom end of the fixing block;

[0023] (2) Place the spring into the groove of the inner cavity of the housing, then place the small end of the fixing block into the groove, and finally insert the rotating joint rotating shaft into the housing so that the dynamic sealing ring and the static sealing ring are pressed and fitted;

[0024] (3) Align the bottom end of the rotating joint rotating shaft with the top end of the sand mill rotating shaft, and then fixedly connect the rotating joint rotating shaft and the sand mill rotating shaft with bolts;

[0025] (4) Finally, insert the discharge pipe into the housing from the top end. The discharge pipe passes through the spring, the fixing block, the static sealing ring, the dynamic sealing ring and the rotating joint rotating shaft in sequence, and finally makes the bottom end of the discharge pipe extend into the sand mill rotating shaft.

[0026] The beneficial effects of the present invention are as follows:

[0027] For the sand mill rotating joint of the present invention, the discharge pipe passes through the sealing ring, isolating the super-hard material from contacting the sealing ring, preventing the sealing ring from being worn by the hard particles in the material, greatly prolonging the service life of the rotating joint, improving the production efficiency and reducing the production cost. Description of the Drawings

[0028] Figure 1 Structural schematic diagram of the rotary joint of the sand mill of the present invention;

[0029] Figure 2 Structural schematic diagram after the rotary joint of the sand mill of the present invention is installed;

[0030] In the figure: 1 - Rotary joint rotating shaft, 2 - Housing, 3 - Spring, 4 - Discharge pipe, 5 - Fixed block, 6 - Stationary sealing ring, 7 - Rotating sealing ring, 8 - Rotary joint, 9 - Feed hopper, 10 - Feed inlet, 11 - Grinding cylinder, 12 - Sand mill rotor, 13 - Sand mill stator. Detailed implementation manners

[0031] The present invention will be further described below through embodiments in conjunction with the accompanying drawings, but not limited thereto.

[0032] Embodiment 1:

[0033] As Figure 1 shown, this embodiment provides a rotary joint of a sand mill that isolates the material from contacting the sealing ring, including a housing 2 and a rotary joint rotating shaft 1, a rotating sealing ring 7, a stationary sealing ring 6, a fixed block 5, a spring 3 and a discharge pipe 4 located inside the housing 2;

[0034] The rotating sealing ring 7 is arranged at the top end of the rotary joint rotating shaft 1, the stationary sealing ring 6 is arranged at the bottom end of the fixed block 5, the stationary sealing ring 6 and the rotating sealing ring 7 are pressed tightly by the spring 3, and the discharge pipe 4 is inserted into the housing 2 and passes through the spring 3, the fixed block 5, the stationary sealing ring 6, the rotating sealing ring 7, and the rotary joint rotating shaft 1 and then extends into the sand mill rotating shaft.

[0035] Among them, the rotating sealing ring 7 and the stationary sealing ring 6 together form a sealing ring. The rotating sealing ring 7 is adhered to the top end of the rotary joint rotating shaft 1 with glue. The stationary sealing ring 6 is adhered to the bottom end of the fixed block 5 with glue. During operation, the rotating sealing ring has a rotating function, the stationary sealing ring is stationary, and the formed sealing ring plays a sealing role.

[0036] The bottom end of the rotary joint rotating shaft 1 extends out of the housing 2, and the bottom end of the rotary joint rotating shaft and the top end of the sand mill rotating shaft are fixedly connected by bolts. The rotary joint rotating shaft 1 is a T-shaped long shaft with a through long hole in the center for the discharge pipe 4 to pass through. There is an outward-extending boss at the bottom end of the rotary joint rotating shaft 1, and there are threaded mounting holes on the boss, and it is installed together with the top end of the sand mill rotating shaft through bolts.

[0037] A groove for accommodating the spring 3 is provided at the top of the inner cavity of the housing 2. The fixed block 5 is a T-shaped block. The small end of the fixed block 5 extends into the groove and is fixed with a pin. Under the action of the spring 3, the fixed block 5 can only slide up and down along the groove and cannot rotate. A sealing ring is installed between the fixed block 5 and the housing 2 to increase the sealing performance.

[0038] Working principle of the adapter of the present invention for a sand mill:

[0039] After the adapter is installed on the rotating shaft of the sand mill, the discharge pipe passes through the spring, fixed block, stationary sealing ring, rotating sealing ring, and the rotating shaft of the rotary joint from the top of the adapter and then extends into the rotating shaft of the sand mill. That is, the bottom end of the discharge pipe is located inside the rotating shaft of the sand mill. During the operation of the sand mill, the ground material in the grinding cylinder directly enters the discharge pipe from inside the rotating shaft of the sand mill without passing through the sealing ring, so that the grinding material will not enter the gap of the sealing ring, thereby avoiding the wear of the rotating sealing ring and the stationary sealing ring during relative rotation and extending the service life of the sealing ring.

[0040] Example 2:

[0041] A rotary joint for a sand mill that isolates the material from the sealing ring has the same structure as that in Example 1, except that: the spring 3 is a disc spring.

[0042] Example 3:

[0043] A sand mill, such as Figure 2 the vertical sand mill shown, includes a grinding cylinder 11, a sand mill rotor 12, a sand mill stator 13, a rotating shaft of the sand mill, and the rotary joint 8 for a sand mill that isolates the material from the sealing ring as described in Example 1;

[0044] Among them, the sand mill rotor 12 and the sand mill stator 13 cooperate and are installed inside the grinding cylinder 11. The sand mill rotor 12 is connected to the rotating shaft of the sand mill, and the top end of the rotating shaft of the sand mill is fixedly connected to the bottom end of the rotating shaft of the rotary joint 1 by bolts.

[0045] Example 4:

[0046] An installation method of a rotary joint for a sand mill that isolates the material from the sealing ring. Install the rotary joint for a sand mill as described in Example 1 on the sand mill, including the following steps:

[0047] (1) Install the rotating sealing ring 7 on the top end of the rotating shaft of the rotary joint 1, and install the stationary sealing ring 6 at the bottom end of the fixed block 5;

[0048] (2) Place the spring 3 into the groove in the inner cavity of the housing 2, then place the small end of the fixed block 5 into the groove, and finally insert the rotating shaft of the rotary joint 1 into the housing 2 so that the rotating sealing ring 7 and the stationary sealing ring 6 are pressed tightly together;

[0049] (3) Align the bottom end of the rotating shaft of the rotary joint 1 with the top end of the rotating shaft of the sand mill, and then fix and connect the rotating shaft of the rotary joint 1 and the rotating shaft of the sand mill with bolts;

[0050] (4)Finally, insert the discharge pipe 4 into the top end of the housing 2. The discharge pipe 4 sequentially passes through the spring 3, the fixed block 5, the stationary seal ring 6, the rotating seal ring 7, and the rotating shaft of the rotary joint 1, and finally the bottom end of the discharge pipe 4 extends into the rotating shaft of the sand mill.

[0051] After installation, during the working process, the rotating shaft of the sand mill drives the rotating shaft of the rotary joint to rotate synchronously. The rotating seal ring and the stationary seal ring rotate relatively. The abrasive directly enters the discharge pipe from the rotating shaft of the sand mill without passing through the seal ring. The material in the grinding cylinder is extracted through the discharge pipe of the rotary joint. The liquid level of the material in the rotating shaft of the sand mill is slightly higher than the feed port of the discharge pipe under the action of negative pressure, and the material forms an air isolation layer between the seal ring of the rotary joint and the liquid level of the material under the action of gravity, isolating the contact between the material and the seal ring, and preventing the abrasive from entering the gap of the seal ring (especially the rotating contact surface between the rotating seal ring and the stationary seal ring), thereby avoiding the wear of the rotating seal ring and the stationary seal ring during the relative rotation process and prolonging the service life of the seal ring.

Claims

1. A sand mill rotary joint that isolates the material from contact with the sealing ring, characterized in that, it includes a housing and a rotary joint rotating shaft, a dynamic sealing ring, a static sealing ring, a fixing block, a spring and a discharge pipe located inside the housing; The dynamic sealing ring is arranged at the top end of the rotary joint rotating shaft, the static sealing ring is arranged at the bottom end of the fixing block, the static sealing ring and the dynamic sealing ring are pressed tightly by a spring, and the discharge pipe is inserted into the housing and passes through the spring, the fixing block, the static sealing ring, the dynamic sealing ring, and the rotary joint rotating shaft and then extends into the sand mill rotating shaft; The bottom end of the rotary joint rotating shaft extends out of the housing, and the bottom end of the rotary joint rotating shaft and the top end of the sand mill rotating shaft are fixedly connected by bolts; A groove for accommodating the spring is provided at the top of the inner cavity of the housing. The fixing block is a T-shaped block. The small end of the fixing block extends into the groove and is fixed by a pin. Under the action of the spring, the fixing block can only slide up and down along the groove.

2. The sand mill rotary joint according to claim 1, characterized in that, the dynamic sealing ring is adhered to the top end of the rotary joint rotating shaft with glue.

3. The sand mill rotary joint according to claim 1, characterized in that, the static sealing ring is adhered to the bottom end of the fixing block with glue.

4. The sand mill rotary joint according to claim 1, characterized in that, a sealing ring is provided between the fixing block and the housing.

5. The sand mill rotary joint according to claim 1, characterized in that, the spring is a disc spring.

6. A sand mill, including a grinding cylinder, a sand mill rotor, a sand mill stator, a sand mill rotating shaft and the sand mill rotary joint for isolating the material from contact with the sealing ring according to any one of claims 1-5; wherein, the sand mill rotor and the sand mill stator cooperate and are installed in the grinding cylinder. The sand mill rotor is connected to the sand mill rotating shaft, and the top end of the sand mill rotating shaft is fixedly connected to the bottom end of the rotary joint rotating shaft.

7. An installation method of a sand mill rotary joint for isolating the material from contact with the sealing ring, installing the sand mill rotary joint according to any one of claims 1-5 on the sand mill, including the following steps: (1) Install the dynamic sealing ring at the top end of the rotary joint rotating shaft, and install the static sealing ring at the bottom end of the fixing block; (2) Place the spring into the groove in the inner cavity of the housing, then place the small end of the fixing block into the groove, and finally insert the rotary joint rotating shaft into the housing so that the dynamic sealing ring and the static sealing ring are pressed tightly and fitted; (3) Align the bottom end of the rotary joint rotating shaft with the top end of the sand mill rotating shaft, and then fixedly connect the rotary joint rotating shaft and the sand mill rotating shaft with bolts; (4) Finally, insert the discharge pipe from the top end of the housing. The discharge pipe passes through the spring, the fixing block, the static sealing ring, the dynamic sealing ring and the rotary joint rotating shaft in sequence, and finally makes the bottom end of the discharge pipe extend into the sand mill rotating shaft.

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