Novel internal mixer rotor end plate cooling water channel and machining method thereof

Abstract

The invention belongs to the technical field of internal mixing equipment, and relates to a novel internal mixer rotor end plate cooling water channel and a machining method thereof.The novel internal mixer rotor end plate cooling water channel comprises five or seven water channel holes, every two adjacent water channel holes are connected to form a through cooling water channel, and the two ends of the cooling water channel are in through connection with a water outlet and a water inlet respectively to form a first-class annular channel; the included angle beta between the connecting line of the starting point of the water channel hole and the center of the rotor end plate and the center line of the water channel hole is 39-48 degrees. By reasonably designing different drilling angles, a plurality of water channel holes which are communicated end to end are machined, and the starting points of the water channel holes are welded and sealed through the blocking plates; according to the rotor end plate cooling water channel obtained through the machining method, the welding area is greatly reduced, the welding seam water leakage probability is remarkably reduced, the welding deformation of the rotor end plate is small, the overall machining manufacturability is better, the size of a part blank is easier to master, the production cost is controlled, meanwhile, the service life of the rotor end plate is obviously prolonged, and the service life of the rotor end plate is prolonged. And the continuous production of the equipment is reliably ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of internal mixer equipment, and particularly relates to a novel internal mixer rotor end plate cooling water channel and a processing method thereof. Background Art

[0002] An internal mixer, or sealed rubber mixer, involves intermittently plasticating and mixing polymer materials in a sealed environment with adjustable temperature and pressure using a pair of rotors of a specific shape that rotate relative to each other. This equipment is widely used in the rubber and plastics industries, particularly excelling in mixing, kneading, crushing, and dispersing high-viscosity materials. Temperature control is crucial during the mixing and plasticizing of rubber and plastics. Excessively high or low temperatures can affect mixing and product quality. Therefore, cooling channels are incorporated into the five major components of the internal mixer: the hammer, mixing chamber, rotor, discharge door top, and rotor end plate.

[0003] Conventional rotor end plate cooling channels such as Figure 5 As shown (including the cooling water channel structure and its AA cross-sectional view, where inlet marked on the figure is the water inlet and outlet is the water outlet), the water channel is designed on the side of the rubber mixing working surface of the rotor end plate. The water channel is a regular annular structure, and an integral annular plugging plate is embedded in the water channel. The entire annular plugging plate is fully welded and sealed; during the production process, additional auxiliary tooling is required to suppress the welding deformation of the parts, or the thickness of the blank is increased to ensure that the parts still have a certain processing allowance after welding deformation, which invisibly increases the production cost and cannot guarantee one-time processing and forming. In addition, the water channel weld is located inside the mixing chamber. During the long-term operation of the internal mixer, it is frequently affected by the friction of the rubber and the movement of the rotor. The weld will gradually wear, thin, or even wear through, which will lead to water leakage and affect the quality of the rubber. At the same time, it will increase the frequency of production line shutdowns and maintenance, thereby increasing the equipment maintenance cost. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and proposes a new type of cooling water channel for the rotor end plate of an internal mixer and a processing method thereof. By rationally drilling multiple water channel holes that are connected end to end on the outer circumferential surface of the rotor end plate, and using blocking plates to weld and seal the starting points of the water channel holes, the weld area of the cooling water channel of the rotor end plate obtained by processing is greatly reduced, the welding deformation of the rotor end plate is small, the overall processing technology is better, and the service life of the rotor end plate is increased while reducing production costs.

[0005] The technical solution of the present invention is:

[0006] A novel cooling water channel for an internal mixer rotor end plate includes five or seven water channel holes. Adjacent water channel holes are connected in pairs to form a through cooling water channel. The two ends of the cooling water channel are respectively connected to the water outlet and the water inlet to form a type of annular channel. The angle β between the line connecting the starting point of the water channel hole and the center of the rotor end plate and the center line of the water channel hole is 39° to 48°.

[0007] In the above cooling water channel, in order to facilitate processing and arrangement of the water inlet and outlet pipes, the first water channel hole and the last water channel hole are respectively vertically connected to the water outlet and water inlet on the end face of the rotor end plate.

[0008] Furthermore, the water channel holes start from the outer periphery of the rotor end plate and are drilled at different angles; the wall thickness between each water channel hole and the inner circumferential surface of the rotor end plate is 12 to 20 mm, and the wall thickness between each water channel hole and the outer circumferential surface of the rotor end plate is 12 to 20 mm.

[0009] The water channel holes and the inner and outer circumferential surfaces of the rotor end plates must maintain sufficient wall thickness, at least 12mm, to ensure cooling water pressure. Based on this, a wall thickness range of 12 to 20mm was designed. In actual processing, wall thicknesses of 12mm, 14mm, 15mm, 18mm, or 20mm can be selected, or any value within this range.

[0010] Furthermore, the number of the water channel holes is 5, including the first water channel hole and the second water channel hole, the second water channel hole and the third water channel hole, the third water channel hole and the fourth water channel hole, and the fourth water channel hole and the fifth water channel hole that are interconnected; the first water channel hole is vertically connected to the water outlet, and the fifth water channel hole is vertically connected to the water inlet.

[0011] Furthermore, the angle β1 between the line connecting the drilling starting point of the first water channel hole and the center of the rotor end plate and the center line of the first water channel hole is 42°, the β2 of the second water channel hole is 45°, the β3 of the third water channel hole is 39°, the β4 of the fourth water channel hole is 42°, and the β5 of the fifth water channel hole is 48°.

[0012] Furthermore, the number of the water channel holes is 7, including a first water channel hole to a seventh water channel hole connected in sequence, the first water channel hole is vertically connected to the water outlet, and the seventh water channel hole is vertically connected to the water inlet;

[0013] Among them, the angle β2 between the line connecting the drilling starting point of the second water channel hole and the center of the rotor end plate and the center line of the second water channel hole is 42 degrees; correspondingly, β3 is 46 degrees, β4 is 41 degrees, β5 is 46 degrees, and β6 is 46 degrees.

[0014] Further, the extension lines of the drill holes of the first water channel hole and the seventh water channel hole both pass through the center of the inner circumferential surface of the rotor end plate. That is, the angle β1 between the connecting line of the drill starting point of the first water channel hole and the rotor end plate center and the center line of the first water channel hole is 0 degree. Similarly, the angle β7 between the connecting line of the drill starting point of the seventh water channel hole and the rotor end plate center and the center line of the seventh water channel hole is 0 degree.

[0015] Further, a counterbore is provided at the drill starting point of the water channel hole, and the depth of the counterbore is at least 20 mm. Based on this, the depth of the counterbore is designed to be 20 - 25 mm, and its diameter is 1 - 3 mm larger than the diameter of the water channel hole. Preferably, the diameter of the counterbore is 2 mm larger than the diameter of the water channel hole.

[0016] Further, a plug plate is fixedly arranged in the counterbore, and the thickness of the plug plate is 3 - 5 mm. A plug plate is inlaid in the counterbore of each water channel hole, and the outside of the plug plate is completely enclosed and full-welded, and the weld thickness is 10 mm.

[0017] The present invention also provides a processing method for the cooling water channel of the rotor end plate of a new type of internal mixer, including the following steps:

[0018] Starting from the outer circumferential surface of the rotor end plate, drill 5 or 7 water channel holes at a suitable angle β, and make the adjacent two water channel holes communicate with each other. Then, vertically penetrate the first water channel hole and the last water channel hole through the water outlet and water inlet on the end face of the rotor end plate respectively, so as to form an integrally penetrated annular cooling water channel; and drill a counterbore with a depth in the range of 20 - 25 mm into the hole at the drill starting point position of each water channel hole, and the diameter of the counterbore is 1 - 3 mm larger than the diameter of the water channel hole. Then, inlay a plug plate in the counterbore, and the outside of the plug plate is completely enclosed and full-welded.

[0019] The beneficial effects of the present invention:

[0020] The present invention provides a new type of cooling water channel for the rotor end plate of an internal mixer and its processing method. By designing a reasonable drilling angle on the outer circumferential surface of the rotor end plate, processing multiple water channel holes that communicate with each other from beginning to end, and using a plug plate to weld and seal the starting point of the water channel hole; the welding area of the cooling water channel of the rotor end plate obtained by this processing method is greatly reduced, the probability of weld leakage is significantly decreased, and moreover, the welding deformation of the rotor end plate is small, the overall processing performance is better, and the size of the part blank is easier to control.

[0021] By adopting the processing method of the present invention, the production cost is easy to control. At the same time, the welds of the water channel holes are distributed on the outer circumferential surface of the rotor end plate, there is no relative movement with the mating parts, and there is no rubber friction, that is, there is no risk of weld friction thinning or wear-through. The service life of the rotor end plate is significantly improved, and the continuous production of the equipment is reliably guaranteed. Brief Description of the Drawings

[0022] Figure 1 Schematic structural diagram of the rotor end plate cooling water channel with five water channel holes provided by the present invention;

[0023] Figure 2 is Figure 1 A - A sectional view of;

[0024] Figure 3 Schematic structural diagram of the plug plate structure in the water channel hole;

[0025] Figure 4 Schematic structural diagram of the rotor end plate cooling water channel with seven water channel holes provided by the present invention;

[0026] Figure 5 Schematic structural diagram of the traditional rotor end plate cooling water channel;

[0027] Wherein, 1, the first water channel hole; 2, the second water channel hole; 3, the third water channel hole; 4, the fourth water channel hole; 5, the fifth water channel hole; 6, the sixth water channel hole; 7, the seventh water channel hole; 8, the plug plate; 9, the water inlet; 10, the water outlet. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] To further understand the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1

[0031] As Figure 1 shown, this embodiment provides a new type of internal mixer rotor end plate cooling water channel, which has five water channel holes, namely the first water channel hole 1, the second water channel hole 2, the third water channel hole 3, the fourth water channel hole 4, and the fifth water channel hole 5. The adjacent water channel holes are connected pairwise to form a through cooling water channel. The head and tail ends of the cooling water channel are respectively connected to the water outlet 10 and the water inlet 9 in a through - connection manner, forming a kind of annular channel.

[0032] Define the included angle between the line connecting the center of the rotor end plate and the starting point of drilling of each water channel hole and the center line of the water channel hole as β. As Figure 1 shown, the included angle β1 of the first water channel hole 1 is 42 degrees, β2 of the second water channel hole 2 is 45 degrees, β3 of the third water channel hole 3 is 39 degrees, β4 of the fourth water channel hole 4 is 42 degrees, and β5 of the fifth water channel hole 5 is 48 degrees.

[0033] For the convenience of processing and the layout of the connecting pipes at the water inlet 9 and the water outlet 10, it can be seen from Figure 2 that the first water channel hole 1 is vertically penetrated through the water outlet 10. Correspondingly, the fifth water channel hole 5 is also vertically penetrated through the water inlet 9. Due to problems such as welding deformation of the rubber mixing working surface caused by welding wear-resistant alloys and machining errors in deep hole drilling during the manufacturing process of the current rotor end plate, and at the same time, factors such as normal wear of the rubber mixing working surface during the use of the rotor end plate are considered. Overall, the positions of the water channel drilling holes distributed on the outer circumferential surface are designed on the central cross-section of the step plate (thickness 65 mm).

[0034] To ensure the required cooling water pressure, sufficient wall thickness needs to be maintained between each water channel hole and the inner and outer circumferential surfaces of the rotor end plate. The wall thickness is at least 20 mm, and in the actual processing process, the wall thickness can be determined according to the actual situation.

[0035] The diameter of the water channel hole is d millimeters (mm). From the starting point of each water channel drilling hole, a counterbore is machined along the water channel hole by reaming. The depth c of the counterbore is at least 20 mm, and the diameter of the counterbore is (d + 2) mm. As Figure 3 shown, in this specific embodiment, the diameter of the machined water channel hole is 25 mm, and the diameter of the counterbore is 27 mm.

[0036] As Figure 3 shown, a plug plate 8 with a thickness t = 3 - 5 mm is inserted into the counterbore of each water channel hole. The outside of the plug plate 8 is completely sealed by full welding, and the weld thickness is 10 mm.

[0037] This embodiment also provides a processing method for the cooling water channel of a new type of internal mixer rotor end plate, including the following steps:

[0038] Starting from the outer circumferential surface of the rotor end plate, 5 water channel holes are drilled according to the angles of β1 = 42°, β2 = 45°, β3 = 39°, β4 = 42°, β5 = 48° respectively. The drilling diameter is ф25 mm. The first water channel hole 1 is connected end to end with the second water channel hole 2, the second water channel hole 2 is connected end to end with the third water channel hole 3, the third water channel hole 3 is connected end to end with the fourth water channel hole 4, and the fourth water channel hole 4 is connected end to end with the fifth water channel hole 5, and they are processed through. In each water channel hole, a counterbore with a diameter of ф27 mm is machined by reaming within at least 20 mm depth range close to the outer circumferential surface of the rotor end plate, and a 5 mm plug plate 8 is inserted into the counterbore. The outside of the plug plate 8 is completely sealed by full welding; then the first water channel hole is vertically processed through with the water outlet 10 on the end face, and the fifth water channel hole is vertically processed through with the water inlet 9 on the end face, thereby forming a whole interconnected annular cooling water channel.

[0039] Example 2

[0040] This embodiment provides a novel cooling water channel for the rotor end plate of a mixer, which has 7 water channel holes, namely the first water channel hole 1, the second water channel hole 2, the third water channel hole 3, the fourth water channel hole 4, the fifth water channel hole 5, the sixth water channel hole 6 and the seventh water channel hole 7. The adjacent water channel holes are connected pairwise to form a continuous cooling water channel. The head and tail ends of the cooling water channel are respectively connected to the water outlet 10 and the water inlet 9 in a through manner, forming a kind of annular channel.

[0041] Define the angle between the line connecting the center of the rotor end plate and the starting point of drilling for each water channel hole and the center line of the water channel hole as β. Among them, the extended line of drilling for the first water channel hole 1 passes through the center of the inner circumferential surface of the rotor end plate, that is, the angle β1 of the first water channel hole 1 is 0 degree; similarly, the extended line of drilling for the seventh water channel hole 7 also passes through the center of the inner circumferential surface of the rotor end plate, that is, the angle β7 of the seventh water channel hole 7 is 0 degree.

[0042] The angle β2 of the second water channel hole 2 is 42°, the β3 of the third water channel hole 3 is 46°, the β4 of the fourth water channel hole 4 is 41°, the β5 of the fifth water channel hole 5 is 46°, and the β6 of the sixth water channel hole 6 is 46°.

[0043] For the convenience of processing and the layout of the water inlet 9 and the water outlet 10 connection pipes, the first water channel hole 1 is vertically and through-connected to the water outlet 10. Correspondingly, the seventh water channel hole 7 is also vertically and through-connected to the water inlet 9.

[0044] In order to ensure the required cooling water pressure, sufficient wall thickness needs to be maintained between each water channel hole and the inner and outer circumferential surfaces of the rotor end plate. The wall thickness is at least 12 mm, and in the actual processing process, the wall thickness can be determined according to the actual situation.

[0045] The diameter of the water channel hole is d millimeters (mm). Starting from the starting point of drilling for each water channel, a counterbore is processed by reaming along the water channel hole. The depth c of the counterbore is at least 20 mm, and the diameter of the counterbore is (d + 2) mm.

[0046] Insert a plug plate 8 with a thickness t = 3 - 5 mm into the counterbore of each water channel hole. The outside of the plug plate 8 is completely enclosed and fully welded, and the weld thickness is 10 mm.

[0047] This embodiment also provides a processing method for the novel cooling water channel of the rotor end plate of a mixer, including the following steps:

[0048] Starting from the outer circumferential surface of the rotor end plate, drill 7 water channels at angles of β1 = 0°, β2 = 42°, β3 = 46°, β4 = 41°, β5 = 46°, β6 = 46°, β7 = 0° respectively. The drilling diameter is ф25mm. The first water channel hole 1 is connected end to end with the second water channel hole 2, the second water channel hole 2 is connected end to end with the third water channel hole 3, the third water channel hole 3 is connected end to end with the fourth water channel hole 4, the fourth water channel hole 4 is connected end to end with the fifth water channel hole 5, the fifth water channel hole 5 is connected end to end with the sixth water channel hole 6, and the sixth water channel hole 6 and the seventh water channel hole 7 are connected end to end and processed through. Ream a counterbore with a diameter of ф27mm within at least 20mm from the outer circumferential surface of the rotor end plate in each water channel hole, and inlay a 5mm plug plate 8 in the counterbore. The outside of the plug plate 8 is fully enclosed and welded; then the first water channel hole is processed through vertically with the water outlet 10 on the end face, and the seventh water channel hole is processed through vertically with the water inlet 9 on the end face, thereby forming a whole interconnected annular cooling water channel.

[0049] The above description is only the preferred embodiment of the present invention and is not a limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, modifications, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A new cooling water channel for the rotor end plate of a mixer, characterized in that, It includes 5 or 7 water channel holes. The adjacent water channel holes are connected pairwise to form a continuous cooling water channel. The two ends of the cooling water channel are respectively connected to the water outlet and the water inlet in a through manner to form a kind of annular channel. The included angle β between the line connecting the starting point of the water channel hole and the center of the rotor end plate and the center line of the water channel hole is 39° to 48°.

2. The novel rotor end plate cooling water channel according to claim 1, wherein The water channel holes start from the outer circumferential surface of the rotor end plate and are drilled at different angles. The wall thickness between each water channel hole and the inner circumferential surface of the rotor end plate is 12 to 20 mm, and the wall thickness between each water channel hole and the outer circumferential surface of the rotor end plate is 12 to 20 mm.

3. A novel rotor end plate cooling water channel of a mixer according to claim 1, characterized in that, The number of the water channel holes is 5, including the first water channel hole and the second water channel hole that are interconnected, the second water channel hole and the third water channel hole, the third water channel hole and the fourth water channel hole, the fourth water channel hole and the fifth water channel hole. The first water channel hole is vertically connected to the water outlet in a through manner, and the fifth water channel hole is vertically connected to the water inlet in a through manner.

4. A novel cooling water channel for the rotor end plate of a mixer, as claimed in claim 3, wherein The included angle β1 between the line connecting the starting point of the drilling of the first water channel hole and the center of the rotor end plate and the center line of the first water channel hole is 42°, β2 of the second water channel hole is 45°, β3 of the third water channel hole is 39°, β4 of the fourth water channel hole is 42°, and β5 of the fifth water channel hole is 48°.

5. A novel cooling water channel for the rotor end plate of a mixer, characterized in that, The number of the water channel holes is 7, including the first water channel hole to the seventh water channel hole that are connected in sequence. The first water channel hole is vertically connected to the water outlet in a through manner, and the seventh water channel hole is vertically connected to the water inlet in a through manner. Among them, the included angle β2 between the line connecting the starting point of the drilling of the second water channel hole and the center of the rotor end plate and the center line of the second water channel hole is 42 degrees. Correspondingly, β3 is 46 degrees, β4 is 41 degrees, β5 is 46 degrees, and β6 is 46 degrees.

6. A novel rotor end plate cooling water channel according to claim 5, characterized in that, The extension lines of the drilling of the first water channel hole and the seventh water channel hole both pass through the center of the inner circumferential surface of the rotor end plate.

7. A novel rotor end plate cooling water channel of a mixer according to claim 1, characterized in that, A counterbore is provided at the starting point of the drilling of the water channel hole. The depth of the counterbore is 20 to 25 mm, and its diameter is 1 to 3 mm larger than the diameter of the water channel hole.

8. A novel rotor end plate cooling water channel of a mixer according to claim 1, characterized in that, A plug plate is fixedly arranged in the counterbore. The thickness of the plug plate is 3 to 5 mm.

9. A processing method for the cooling water channel of the rotor end plate of a new type of internal mixer according to any one of claims 1-8, characterized in that, It includes the following steps: Starting from the outer circumferential surface of the rotor end plate, drill 5 or 7 water channel holes at an appropriate angle β, and process the adjacent two water channel holes to be interconnected with each other. Then, vertically connect the first water channel hole and the last water channel hole to the water outlet and the water inlet on the end face of the rotor end plate respectively to form a continuously through kind of annular cooling water channel. Drill a counterbore with a depth range of 20 to 25 mm into the hole at the starting point position of each water channel hole. The diameter of the counterbore is 1 to 3 mm larger than the diameter of the water channel hole. Then, insert a plug plate into the counterbore, and fully seal and weld the outside of the plug plate.

Images