A concrete mixing box for preventing fast-setting cement from blocking

Abstract

The utility model relates to a quick -setting cement production equipment, concretely is a concrete mixing box of preventing quick -setting cement block, to solve the technical problem that cement slurry is easy to block the support end of stirring shaft and lead to the jamming of stirring shaft in the process of discharging that quick -setting cement, sand and gravel, mixed material etc. are mixed and output in the existing concrete mixing box, the utility model discloses a box body, stirring shaft and sealing device, sealing device includes wear -resistant bottom plate, spacer ring, inner sealing plate and seal ring, wear -resistant bottom plate, spacer ring, inner sealing plate are connected in turn and are pressed tightly in the inside of box body front end board, wear -resistant bottom plate is set in the outside of stirring shaft medium diameter section, spacer ring and inner sealing plate all are set in the outside of stirring shaft large diameter section, and wear -resistant bottom plate, inner sealing plate form clearance seal between medium diameter section and large diameter section respectively, inner sealing plate, wear -resistant bottom plate, large diameter section and spacer ring form a passageway, and seal ring sets up in the passageway, and its inner periphery and large diameter section between seal solid link, and one side is pressed tightly on wear -resistant bottom plate.

Description

Technical Field

[0001] This utility model relates to a fast-setting cement production equipment, specifically to a concrete mixing tank that prevents fast-setting cement from clogging. Background Technology

[0002] The continuous forced concrete mixing equipment weighs and prepares various concrete materials according to a given ratio by the batching system, and then continuously and evenly feeds the materials into the concrete mixing tank at a specified time. The concrete mixing tank can feed and discharge at the same time, producing qualified concrete with balanced feeding and discharging, thus realizing continuous discharge throughout the entire process from batching and mixing to discharging.

[0003] In emergency repair projects such as airport road surfaces, highway surfaces, bridges, and tunnels, quick-setting cement is often used. Existing concrete mixing tanks use a mixing shaft to drive a mixing screw, mixing quick-setting cement, sand, gravel, and other materials in a specific ratio before outputting the mixture. However, due to the rapid setting time of quick-setting cement and the high requirements for mixing ratios, using existing concrete mixing tanks can easily cause cement slurry to clog the support end of the mixing shaft during the discharge process, leading to shaft jamming. In addition, the mixing shaft often jams because the cement cannot be discharged in time. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of existing concrete mixing boxes, which mix and output quick-setting cement, sand, gravel, and other materials in a certain proportion. During the discharge process, cement slurry easily clogs the support end of the mixing shaft, causing the mixing shaft to jam. In addition, the mixing shaft often jams because the cement cannot be discharged in time. Therefore, this invention provides a concrete mixing box that prevents quick-setting cement from clogging.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A concrete mixing tank for preventing blockage by fast-setting cement includes a tank body, a mixing shaft, and a first bearing. The front and rear ends of the tank body are respectively provided with a feed inlet and a discharge outlet. The mixing shaft, from rear to front, includes a drive section, a large-diameter section, and a support section connected in sequence. The drive section is rotatably connected to the rear end plate of the tank body. The large-diameter section is located inside the tank body and is equipped with a mixing spiral. The support section includes a medium-diameter section and a small-diameter section connected in sequence to the large-diameter section. The medium-diameter section passes through the front end plate of the tank body. A bearing mounting seat is provided on the outer side of the front end plate of the tank body. The outer ring of the first bearing is mounted on the bearing mounting seat, and the inner ring is mounted on the small-diameter section. Its special feature is that:

[0007] It also includes a sealing device, which includes a wear-resistant base plate, a spacer, an inner sealing plate, and a sealing ring;

[0008] The wear-resistant base plate, spacer ring, and inner sealing plate are sequentially pressed and connected to the inner side of the front plate by fasteners from near to far.

[0009] The wear-resistant base plate is fitted on the outside of the intermediate diameter section, and the spacer and inner sealing plate are fitted on the outside of the large diameter section. The wear-resistant base plate and the inner sealing plate form gap seals with the intermediate diameter section and the large diameter section, respectively. A channel is formed between the inner sealing plate, the wear-resistant base plate, the outer circumferential surface of the large diameter section of the stirring shaft, and the inner circumferential surface of the spacer.

[0010] The sealing ring is set inside the channel, and its inner circumference is sealed and fixedly connected to the outer circumference of the large diameter section. The side of the sealing ring near the wear-resistant base plate is pressed tightly onto the wear-resistant base plate.

[0011] Furthermore, the wear-resistant base plate is provided with a lubrication through hole communicating with the channel, and the front end plate is provided with a first oil injection hole corresponding to the lubrication through hole. A grease cup is installed on the first oil injection hole, and the lubrication through hole and the channel are filled with grease.

[0012] Furthermore, the sealing device also includes an inner cover plate fitted onto the large-diameter section. The inner cover plate is pressed and connected to the side of the inner sealing plate away from the spacer by fasteners, and a gap seal is formed between the inner circumferential surface of the inner cover plate and the outer circumferential surface of the large-diameter section.

[0013] Furthermore, the sealing device also includes a retaining ring, through which fasteners press the inner cover plate tightly onto the side of the inner sealing plate away from the spacer ring.

[0014] Furthermore, the sealing ring has an integrally formed first outer ring portion, an inner ring portion, and a first conical ring portion;

[0015] The inner circumference of the inner ring and the outer circumference of the large-diameter section are connected by a welded seal.

[0016] The small-diameter end of the first conical ring is connected to the outer circumference of the inner ring, and the large-diameter end of the first conical ring is connected to the inner circumference of the first outer ring.

[0017] The front side of the first outer ring is pressed tightly against the wear-resistant base plate.

[0018] Furthermore, the inner cover has a second outer ring portion and a second conical ring portion. The second outer ring portion is pressed between the inner sealing plate and the retaining ring by fasteners. The large diameter end of the second conical ring portion is connected to the inner circumference of the second outer ring portion. The small diameter end of the second conical ring portion is away from the inner sealing plate relative to the large diameter end. A gap seal is formed between the small diameter end of the second conical ring portion and the outer circumferential surface of the large diameter section.

[0019] The inner cover is made of steel, and the inner sealing plate is made of rubber.

[0020] Furthermore, the bearing mounting base is fixedly mounted on the front end plate by a bracket, which includes an outer bracket and an inner bracket. The outer bracket is fixedly connected to the front end plate, and the inner bracket is fixedly connected to the outer bracket. The middle diameter section rotatably passes through the inner hole of the inner bracket. An axially extending lubrication channel is provided on the inner circumference of the inner hole of the inner bracket, and the lubrication channel is filled with grease. A second oil injection hole is provided on the inner bracket. The second oil injection hole extends radially and communicates with the lubrication channel, and a grease cup is installed on the second oil injection hole.

[0021] The bearing mounting base is fixedly connected to the front end of the inner bracket;

[0022] An annular sealing groove is provided at the inner circumference of the front end of the inner support, and a sealing ring is installed in the annular sealing groove. The inner circumference of the sealing ring presses against the outer circumference of the middle diameter section. A sealing gasket is provided between the rear end and the front end plate of the inner support, and the sealing gasket is fitted on the middle diameter section.

[0023] Furthermore, a bearing pad is provided between the inner bracket and the bearing mounting seat. The bearing pad is fitted onto the intermediate diameter section, and a gap seal is formed between the inner circumferential surface of the bearing pad and the outer circumferential surface of the intermediate diameter section. The bearing mounting seat is fixedly connected to the front end of the inner bracket by bolts.

[0024] The bearing pad is made of rubber.

[0025] Furthermore, the stirring spiral includes multiple conveying spirals and multiple stirring components;

[0026] Multiple conveying screws and multiple mixing components are alternately arranged on the large diameter section. Each mixing component includes multiple mixing blades. All conveying screws and all mixing blades are spirally distributed around the central axis of the mixing shaft.

[0027] The drive section of the stirring shaft is connected to the output end of the drive motor, which is located on the outside of the rear end plate of the housing.

[0028] Furthermore, the bottom plate of the enclosure is detachably connected to the bottom of the enclosure by fasteners, and the bottom plate is made of polyurethane.

[0029] The advantages of this utility model compared to the prior art are:

[0030] 1. In the concrete mixing tank of this utility model for preventing blockage of fast-setting cement, a gap seal is formed between the inner circumferential surface of the inner sealing plate and the outer circumferential surface of the large-diameter section, the inner circumference of the sealing ring is sealed and fixedly connected with the outer circumference of the large-diameter section, and a compression seal is formed between the sealing ring and the wear-resistant bottom plate, forming a labyrinth-type sealing structure, which can effectively prevent cement slurry from flowing to the connection between the mixing shaft and the front end plate, ensuring smooth rotation of the mixing shaft.

[0031] 2. The concrete mixing tank of this utility model for preventing blockage of fast-setting cement is filled with grease in the channel, which can effectively prevent cement slurry from flowing out through the channel. The inner circumferential surface of the inner cover plate and the outer circumferential surface of the large diameter section form a gap seal, which can effectively prevent cement slurry from flowing into the channel. Thus, it can effectively prevent cement slurry from flowing into the connection between the mixing shaft and the front plate, ensuring smooth rotation of the mixing shaft.

[0032] 3. In the concrete mixing tank of this utility model for preventing blockage of fast-setting cement, a lubrication channel extending axially is provided on the inner circumference of the inner support. The lubrication channel is filled with grease. This arrangement can effectively avoid mechanical wear between the mixing shaft and related parts, and can also effectively prevent cement slurry from flowing to the first bearing.

[0033] 4. The concrete mixing tank of this utility model for preventing blockage of fast-setting cement is equipped with a mixing spiral including multiple conveying spirals and multiple mixing components, which can make the material evenly mixed and prevent the fast-setting cement from solidifying too quickly in the tank due to the slow conveying speed.

[0034] 5. The concrete mixing tank of this utility model for preventing blockage of fast-setting cement has a bottom plate made of polyurethane material, which can prevent cement from sticking. At the same time, it adopts a detachable structure, which makes it convenient to remove the bottom plate of the tank for cleaning when materials are stuck in the tank. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of an embodiment of the concrete mixing tank for preventing blockage by fast-setting cement according to the present invention.

[0036] Figure 2 This is a top view of an embodiment of the concrete mixing tank for preventing blockage by fast-setting cement according to the present invention.

[0037] Figure 3 This is a partial cross-sectional view of an embodiment of the concrete mixing tank for preventing blockage by fast-setting cement according to the present invention.

[0038] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0039] The annotations in the attached figures are explained as follows:

[0040] 1-Box body, 11-Box bottom plate, 12-Front end plate, 2-Agitator shaft, 21-Large diameter section, 22-Medium diameter section, 23-Small diameter section, 3-Agitator spiral, 31-Feeding spiral, 32-Agitator assembly, 4-First bearing, 5-Bearing mounting seat, 6-Sealing device, 61-Wear-resistant base plate, 611-Lubrication through hole, 62-Spacer ring, 63-Inner sealing plate, 64-Sealing ring, 641-First outer ring, 642-Inner ring, 643-First conical ring, 65-Inner cover plate, 651-Second outer ring, 652-Second conical ring, 66-Guarding ring, 67-Bearing pad, 68-Sealing ring, 69-Sealing gasket, 7-Bracket, 71-Outer bracket, 72-Inner bracket, 721-Second oil injection hole, 8-Channel, 9-Feed inlet, 10-Drive motor. Detailed Implementation

[0041] To make the objectives, advantages and features of this utility model clearer, the following describes in further detail a concrete mixing tank for preventing blockage of fast-setting cement, in conjunction with the accompanying drawings and specific embodiments.

[0042] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Reference Figures 1 to 3 The present invention relates to a concrete mixing tank for preventing blockage of fast-setting cement, comprising a tank body 1, a mixing shaft 2, a first bearing 4, a bearing mounting seat 5, a sealing device 6, and a drive motor 10.

[0044] like Figure 1 As shown, the front and rear ends of the box 1 are respectively provided with a feed inlet 9 and a discharge outlet. The bottom plate 11 of the box 1 is detachably connected to the bottom of the box 1 by bolts, and the bottom plate 11 is made of polyurethane. The use of polyurethane material for the bottom plate 11 can avoid cement adhesion, and the detachable structure makes it convenient to remove the bottom plate 11 for cleaning the box 1 when materials are stuck in it.

[0045] like Figure 2 and Figure 3 As shown, the stirring shaft 2 comprises a drive section, a large-diameter section 21, and a support section connected sequentially from back to front. The drive section of the stirring shaft 2 is rotatably connected to the rear end plate of the housing 1 via a second bearing. The drive motor 10 is located on the outside of the rear end plate of the housing 1, and the drive section of the stirring shaft 2 is connected to the output end of the drive motor 10.

[0046] The large-diameter section 21 is located inside the housing 1, and a stirring spiral 3 is installed on the large-diameter section 21. The stirring spiral 3 includes multiple conveying spirals 31 and multiple stirring components 32, which are alternately arranged on the large-diameter section 21. Each stirring component 32 includes multiple stirring blades, and all conveying spirals 31 and stirring blades are spirally distributed around the central axis of the stirring shaft 2. The arrangement of the stirring spiral 3, including multiple conveying spirals 31 and multiple stirring components 32, can ensure uniform mixing of materials and prevent fast-setting cement from solidifying too quickly inside the housing 1 due to a slow conveying speed.

[0047] The support section includes a middle diameter section 22 and a small diameter section 23 connected sequentially to the large diameter section 21. The diameter of the middle diameter section 22 is smaller than the diameter of the large diameter section 21, and the diameter of the small diameter section 23 is smaller than the diameter of the middle diameter section 22. The middle diameter section 22 passes through the front end plate 12 of the housing 1. The bearing mounting seat 5 is fixed to the outside of the front end plate 12 by a bracket 7. The bracket 7 includes an outer bracket 71 and an inner bracket 72. The outer bracket 71 is fixedly connected to the front end plate 12 by welding, and the inner bracket 72 is fixedly connected to the outer bracket 71 by bolts. The intermediate diameter section 22 rotatably passes through the inner hole of the inner bracket 72. The bearing mounting seat 5 is fixedly connected to the front end of the inner bracket 72 by bolts. A bearing pad 67 is provided between the inner bracket 72 and the bearing mounting seat 5. The bearing pad 67 is fitted on the intermediate diameter section 22, and a gap seal is formed between the inner circumferential surface of the bearing pad 67 and the outer circumferential surface of the intermediate diameter section 22. The bearing pad 67 is made of rubber. The outer ring of the first bearing 4 is installed on the bearing mounting seat 5, and the inner ring of the first bearing 4 is installed on the small diameter section 23.

[0048] like Figure 3 As shown, the inner circumference of the inner hole of the inner support 72 is provided with an axially extending lubrication channel. The lubrication channel is a groove provided on the inner circumference of the inner support 72. The lubrication channel is filled with grease. This arrangement can effectively avoid mechanical wear between the stirring shaft 2 and related parts, and can also effectively prevent cement slurry from flowing to the first bearing 4. The inner support 72 is provided with a second oil injection hole 721, which extends radially and communicates with the above-mentioned lubrication channel. A grease cup is installed on the second oil injection hole 721. An annular sealing groove is provided at the inner circumference of the front end of the inner support 72. A sealing ring 68 is installed in the annular sealing groove. The inner circumference of the sealing ring 68 presses against the outer circumference of the intermediate diameter section 22. This arrangement can not only prevent the grease in the lubrication channel from flowing out, but also effectively prevent cement slurry from flowing to the first bearing 4. A sealing gasket 69 is provided between the rear end of the inner support 72 and the front end plate 12. The sealing gasket 69 is fitted on the intermediate diameter section 22.

[0049] like Figure 3 and Figure 4As shown, the sealing device 6 includes a wear-resistant base plate 61, a spacer 62, an inner sealing plate 63, a sealing ring 64, an inner cover plate 65, and a protective ring 66. The wear-resistant base plate 61, spacer 62, inner sealing plate 63, inner cover plate 65, and protective ring 66 are sequentially pressed and connected to the inner side of the front end plate 12 by fasteners from near to far. The fasteners are multiple pairs of mating bolts and nuts.

[0050] A wear-resistant base plate 61 is fitted onto the outer side of the intermediate diameter section 22, forming a gap seal between the wear-resistant base plate 61 and the intermediate diameter section 22. A spacer ring 62 and an inner sealing plate 63 are both fitted onto the outer side of the large diameter section 21, forming a gap seal between the inner sealing plate 63 and the large diameter section 21. The inner sealing plate 63 is made of rubber. A channel 8 is formed between the inner sealing plate 63, the wear-resistant base plate 61, the outer circumferential surface of the large diameter section 21 of the stirring shaft 2, and the inner circumferential surface of the spacer ring 62. A sealing ring 64 is positioned within the channel 8. The sealing ring 64 has an integrally formed first outer ring portion 641, inner ring portion 642, and first conical ring portion 643. The inner circumference of the inner ring portion 642 is welded to the outer circumference of the large-diameter section 21 for sealing connection. The small-diameter end of the first conical ring portion 643 is welded to the outer circumference of the inner ring portion 642, and the large-diameter end of the first conical ring portion 643 is welded to the inner circumference of the first outer ring portion 641. The front side of the first outer ring portion 641 is pressed against the wear-resistant base plate 61. This arrangement forms a labyrinth-type sealing structure, which can effectively prevent cement slurry from flowing to the connection between the stirring shaft 2 and the front end plate 12, thereby ensuring smooth rotation of the stirring shaft 2. In other embodiments, the first outer ring portion 641, inner ring portion 642, and first conical ring portion 643 of the sealing ring 64 can also be integrally formed by casting or other methods.

[0051] The wear-resistant base plate 61 is provided with a lubrication through hole 611 communicating with the channel 8. The front end plate 12 is provided with a first oil injection hole corresponding to the lubrication through hole 611. A grease cup is installed on the first oil injection hole. The lubrication through hole 611 and the channel 8 are filled with grease. Filling the lubrication through hole 611 and the channel 8 with grease can effectively prevent cement slurry from flowing out through the channel 8. Combined with the above-mentioned labyrinth seal structure, it can further prevent cement slurry from flowing to the connection between the stirring shaft 2 and the front end plate 12, ensuring smooth rotation of the stirring shaft 2.

[0052] The inner cover plate 65 is fitted onto the large-diameter section 21. Fasteners press the inner cover plate 65 tightly onto the side of the inner sealing plate 63 away from the spacer ring 62 via the retaining ring 66, and a gap seal is formed between the inner circumferential surface of the inner cover plate 65 and the outer circumferential surface of the large-diameter section 21. A small gap seal is formed between the inner cover plate 65 and the stirring shaft 2, which can effectively prevent cement slurry from flowing into the above-mentioned labyrinth seal structure, further improving the sealing performance. In order to give the inner cover plate 65 better structural strength, the inner cover plate 65 has a second outer ring portion 651 and a second conical ring portion 652. The second outer ring portion 651 is pressed between the inner sealing plate 63 and the retaining ring 66 by fasteners. The large-diameter end of the second conical ring portion 652 is connected to the inner circumference of the second outer ring portion 651, and the small-diameter end of the second conical ring portion 652 is away from the inner sealing plate 63 relative to the large-diameter end. A gap seal is formed between the small-diameter end of the second conical ring portion 652 and the outer circumferential surface of the large-diameter section 21. The inner cover plate 65 is made of steel.

[0053] This utility model provides a concrete mixing tank for preventing blockage by quick-setting cement. It can effectively prevent the mixing shaft 2 from getting stuck due to cement solidification and is suitable for the construction requirements of special materials such as quick-setting cement.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A concrete mixing tank for preventing blockage of fast-setting cement, comprising a tank body (1), a mixing shaft (2), and a first bearing (4); the front end and rear end of the tank body (1) are respectively provided with a feed inlet (9) and a discharge outlet; the mixing shaft (2) comprises, from back to front, a drive section, a large-diameter section (21), and a support section connected in sequence, the drive section being rotatably connected to the rear end plate of the tank body (1); the large-diameter section (21) is disposed inside the tank body (1), and a mixing spiral (3) is disposed on the large-diameter section (21); the support section comprises a medium-diameter section (22) and a small-diameter section (23) connected in sequence to the large-diameter section (21); the medium-diameter section (22) passes through the front end plate (12) of the tank body (1); a bearing mounting seat (5) is disposed on the outside of the front end plate (12) of the tank body (1), the outer ring of the first bearing (4) is mounted on the bearing mounting seat (5), and the inner ring is mounted on the small-diameter section (23); characterized in that: It also includes a sealing device (6), which includes a wear-resistant base plate (61), a spacer (62), an inner sealing plate (63), and a sealing ring (64); The wear-resistant base plate (61), spacer (62), and inner sealing plate (63) are sequentially pressed and connected to the inner side of the front end plate (12) by fasteners from near to far. The wear-resistant base plate (61) is sleeved on the outside of the middle diameter section (22), and the spacer (62) and the inner sealing plate (63) are both sleeved on the outside of the large diameter section (21). The wear-resistant base plate (61) and the inner sealing plate (63) form a gap seal with the middle diameter section (22) and the large diameter section (21) respectively. The inner sealing plate (63), the wear-resistant base plate (61), the outer circumferential surface of the large diameter section (21) of the stirring shaft (2) and the inner circumferential surface of the spacer (62) form a channel (8). The sealing ring (64) is set in the channel (8), and its inner circumference is sealed and fixedly connected with the outer circumference of the large diameter section (21). The side of the sealing ring (64) near the wear-resistant base plate (61) is pressed against the wear-resistant base plate (61).

2. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 1, characterized in that: The wear-resistant base plate (61) is provided with a lubrication through hole (611) communicating with the channel (8), and the front end plate (12) is provided with a first oil injection hole corresponding to the lubrication through hole (611). A grease cup is installed on the first oil injection hole, and the lubrication through hole (611) and the channel (8) are filled with grease.

3. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 2, characterized in that: The sealing device (6) further includes an inner cover plate (65) sleeved on the large diameter section (21). The inner cover plate (65) is pressed and connected to the side of the inner sealing plate (63) away from the spacer (62) by fasteners, and a gap seal is formed between the inner circumferential surface of the inner cover plate (65) and the outer circumferential surface of the large diameter section (21).

4. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 3, characterized in that: The sealing device (6) also includes a retaining ring (66), through which the fastener presses the inner cover plate (65) onto the side of the inner sealing plate (63) away from the spacer ring (62).

5. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 4, characterized in that: The sealing ring (64) has an integrally formed first outer ring portion (641), an inner ring portion (642), and a first conical ring portion (643); The inner circumference of the inner ring (642) and the outer circumference of the large diameter section (21) are connected by welding and sealing. The small-diameter end of the first conical ring portion (643) is connected to the outer periphery of the inner ring portion (642), and the large-diameter end of the first conical ring portion (643) is connected to the inner periphery of the first outer ring portion (641); The front side of the first outer ring (641) is pressed against the wear-resistant base plate (61).

6. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 5, characterized in that: The inner cover plate (65) has a second outer ring portion (651) and a second conical ring portion (652). The second outer ring portion (651) is pressed between the inner sealing plate (63) and the retaining ring (66) by fasteners. The large diameter end of the second conical ring portion (652) is connected to the inner circumference of the second outer ring portion (651). The small diameter end of the second conical ring portion (652) is away from the inner sealing plate (63) relative to the large diameter end. A gap seal is formed between the small diameter end of the second conical ring portion (652) and the outer circumferential surface of the large diameter section (21). The inner cover plate (65) is made of steel, and the inner sealing plate (63) is made of rubber.

7. The concrete mixing tank for preventing blockage of fast-setting cement according to any one of claims 1-6, characterized in that: The bearing mounting base (5) is fixedly mounted on the front end plate (12) by a bracket (7). The bracket (7) includes an outer bracket (71) and an inner bracket (72). The outer bracket (71) is fixedly connected to the front end plate (12), and the inner bracket (72) is fixedly connected to the outer bracket (71). The middle diameter section (22) rotatably passes through the inner hole of the inner bracket (72). A lubrication channel extending axially is provided on the inner circumference of the inner hole of the inner bracket (72), and the lubrication channel is filled with grease. A second oil injection hole (721) is provided on the inner bracket (72). The second oil injection hole (721) extends radially and communicates with the lubrication channel, and a grease cup is installed on the second oil injection hole (721). The bearing mounting base (5) is fixedly connected to the front end of the inner bracket (72); An annular sealing groove is provided at the inner circumference of the front end of the inner support (72), and a sealing ring (68) is installed in the annular sealing groove. The inner circumference of the sealing ring (68) presses against the outer circumference of the middle diameter section (22). A sealing gasket (69) is provided between the rear end of the inner support (72) and the front end plate (12), and the sealing gasket (69) is sleeved on the middle diameter section (22).

8. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 7, characterized in that: A bearing pad (67) is provided between the inner bracket (72) and the bearing mounting seat (5). The bearing pad (67) is fitted on the intermediate diameter section (22), and a gap seal is formed between the inner circumferential surface of the bearing pad (67) and the outer circumferential surface of the intermediate diameter section (22). The bearing mounting seat (5) is fixedly connected to the front end of the inner bracket (72) by bolts. The bearing pad (67) is made of rubber.

9. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 1, characterized in that: The stirring spiral (3) includes multiple conveying spirals (31) and multiple stirring components (32); Multiple conveying screws (31) and multiple stirring components (32) are alternately arranged on the large diameter section (21). Each stirring component (32) includes multiple stirring blades. All conveying screws (31) and all stirring blades are spirally distributed around the central axis of the stirring shaft (2). The drive section of the stirring shaft (2) is connected to the output end of the drive motor (10), and the drive motor (10) is located on the outside of the rear end plate of the housing (1).

10. The concrete mixing tank for preventing blockage of fast-setting cement according to claim 1, characterized in that: The bottom plate (11) of the box body (1) is detachably connected to the bottom of the box body (1) by fasteners, and the bottom plate (11) is made of polyurethane.

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