Double-horizontal-shaft concrete mixer

Abstract

The utility model discloses a double-horizontal-shaft concrete mixer which comprises a mixing drum, two mixing shafts are arranged in the mixing drum in parallel, the mixing shafts comprise a driving shaft and a driven shaft, the driving shaft is connected with a driving device arranged at the front end of the mixing drum, and the driving shaft and the driven shaft are connected through a gear transmission device arranged at the rear end of the mixing drum. Large stirring paddles and small stirring paddles are arranged on the stirring shaft at intervals, blades of the large stirring paddles are arranged close to the edge of the stirring barrel, blades of the small stirring paddles are arranged close to the stirring shaft, and the large stirring paddles and the small stirring paddles on the driving shaft and the driven shaft are arranged in a staggered manner. According to the double-horizontal-shaft concrete mixer, the effective mixing area is large, concrete is not prone to sticking shafts and caking, and the mixing quality and the mixing effect can be effectively improved while energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete processing, in particular to a twin-horizontal-shaft concrete mixer. Background Art

[0002] Twin-shaft concrete mixers are widely used in the field of engineering machinery. They are mainly a kind of mixing equipment that can mix aggregates, mineral materials, cement and water in proportion through forced mixing to evenly mix the various raw materials to achieve finished concrete that meets the requirements of engineering specifications.

[0003] At present, due to the limitation of the mixing principle, the existing twin-shaft concrete mixers in China generally have a circular mixing drum, a horizontally placed mixing shaft passing through the center of the mixing drum, a mixing arm radially fixed on the mixing shaft, and a mixing blade installed on the outer end of the mixing arm. When the mixing shaft rotates, the linear velocity of each point on the mixing arm is proportional to the radius. Therefore, the mixing linear velocity is very low near the mixing shaft, forming an inefficient mixing area. The inefficient mixing area easily causes a large amount of cement to adhere to the two mixing shafts and produce a "shaft sticking" phenomenon. The shaft sticking of the mixing equipment will lead to a decrease in the mixing quality and mixing efficiency, affecting the mixing performance of the concrete under the same mixing time. In addition, the existing twin-shaft concrete mixers also have problems such as complex structure, high operating cost, and inconvenient installation and maintenance in the sealing structure and unloading structure of the mixing shaft, which need to be further improved. Utility Model Content

[0004] The utility model aims to provide a twin-horizontal-shaft concrete mixer with good stirring effect and high stirring efficiency.

[0005] The purpose of the utility model is achieved as follows: a twin-horizontal-shaft concrete mixer, comprising a mixing drum, two mixing shafts are arranged in parallel in the mixing drum, the mixing shaft comprises a driving shaft and a driven shaft, the driving shaft is connected to a driving device arranged at the front end of the mixing drum, the driving shaft and the driven shaft are connected through a gear transmission device arranged at the rear end of the mixing drum, a large mixing paddle and a small mixing paddle are arranged at intervals on the mixing shaft, the blades of the large mixing paddle are arranged close to the edge of the mixing drum, the blades of the small mixing paddle are arranged close to the mixing shaft, and the large mixing paddle and the small mixing paddle are arranged in a staggered manner on the driving shaft and the driven shaft. The twin-horizontal-shaft concrete mixer of the utility model has a large effective mixing area, concrete is not easy to stick to the shaft and form lumps, and can effectively improve the mixing quality and mixing effect while reducing energy consumption.

[0006] As a further improvement of the utility model, a sealing assembly is provided at the connection position between the stirring shaft and the stirring drum, and the sealing assembly includes a fixing seat and a gland sleeved on the stirring shaft, the fixing seat is in an annular shape as a whole, and the front end of the outer wall has a large flange, and the large flange is fixedly connected to the side wall of the stirring drum, and the inner wall of the fixing seat is provided with an annular groove, and a sealing filler is provided in the annular groove, and the rear end of the gland is inserted into the annular groove and abuts against the sealing filler, and the front end of the gland has a small flange, and the connecting bolt passes through the small flange and is threadedly connected to the fixing seat. The sealing assembly has a simple structure, is easy to connect, and can effectively prevent material leakage from the inside, greatly improves the reliability of the seal, and reduces the frequency of maintenance and the maintenance cost.

[0007] As a further improvement of the utility model, the bottom of the mixing drum is symmetrically shaped like a double arc, which reduces the dead zone of mixing, and a discharge port is provided at the position where the two arcs are connected. A double-opening discharge door is hinged at the discharge port position, and the double-opening discharge door is connected to the drive assembly. By adopting the double-opening discharge door, the material can be discharged faster, the unloading time can be reduced, and the production efficiency can be improved.

[0008] As a further improvement of the utility model, the double-opening discharge door includes a pair of symmetrically arranged arc-shaped plates, the roots of the arc-shaped plates are hinged to the mounting seat arranged at the bottom of the mixing drum, and the driving assembly includes a first short connecting rod, a second short connecting rod, a long connecting rod, a cylinder, a hinge seat, a first transmission rod and a second transmission rod. One end of the first short connecting rod and the second short connecting rod are respectively fixedly connected to the roots of the arc-shaped plates, and the other ends of the first short connecting rod and the second short connecting rod are respectively hinged to the two ends of the long connecting rod, and one end of the long connecting rod is hinged to the second transmission rod at the same time, and the other end of the second transmission rod is hinged to the cylinder lifting and retracting rod and the first transmission rod at the same time. The top of the cylinder is hinged to the side wall of the mixing drum, and the other end of the first transmission rod is hinged to the hinge seat, which is fixed to the bottom side of the mixing drum bracket. A pair of arc-shaped plates are driven to open and close simultaneously by a driving assembly, and the structural design is ingenious and cost-saving.

[0009] As a further improvement of the utility model, the end of the arc plate is provided with an elastic part. When the driving component drives the arc plate to open and enter the unloading state, the elastic part at the end is slightly deformed under the action of concrete, which can increase the unloading speed and reduce the retention of concrete in the elastic part. In the process of the driving component driving the arc plate to close, the concrete residue on the elastic part can be further reduced through moderate squeezing of the ends of a pair of arc plates. Moreover, when the unloading door is in a closed state, under the action of the cylinder, the elastic parts of a pair of arc plates are in abutted closed state and will not leak. Even if the elastic part at the end of the arc plate is slightly moved downward by the pressure of the material, the pair of elastic parts will be squeezed against each other due to interference during the downward movement, which further avoids leakage.

[0010] As a further improvement of the utility model, the number of large stirring paddles and small stirring paddles are both 4, which are evenly distributed on the stirring shaft, further improving the stirring effect and preventing the concrete from sticking to the shaft.

[0011] As a further improvement of the utility model, the blades of the small stirring paddle are arranged to be inclined at 45 degrees relative to the stirring shaft, so as to further prevent the concrete from sticking to the shaft.

[0012] As a further improvement of the utility model, the number of sealing fillers in the annular groove is three groups to ensure the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a twin-horizontal-shaft concrete mixer of the present utility model.

[0014] Figure 2 for Figure 1 Top view of the .

[0015] Figure 3 for Figure 1 Enlarged view at K in the middle.

[0016] Figure 4 It is a side view of the mixing barrel of the twin-horizontal-shaft concrete mixer of the utility model.

[0017] Among them, 1 is a mixing drum, 2 is a mixing shaft, 3 is a driving device, 4 is a gear transmission device, 5 is a large mixing paddle, 6 is a small mixing paddle, 7 is a fixed seat, 8 is a gland, 9 is a sealing packing, 10 is a connecting bolt, 11 is an arc plate, 11A is an elastic part, 12 is a mounting seat, 13 is a first short connecting rod, 14 is a second short connecting rod, 15 is a long connecting rod, 16 is a cylinder, 17 is a hinged seat, 18 is a first transmission rod, and 19 is a second transmission rod. DETAILED DESCRIPTION

[0018] like Figure 1-4 The twin-horizontal-shaft concrete mixer shown comprises a mixing drum 1, in which two mixing shafts 2 are arranged in parallel, and the mixing shaft 2 comprises a driving shaft and a driven shaft, the driving shaft is connected to a driving device 3 arranged at the front end of the mixing drum 1, and the driving shaft and the driven shaft are connected through a gear transmission device 4 arranged at the rear end of the mixing drum 1, and a large mixing paddle 5 and a small mixing paddle 6 are arranged at intervals on the mixing shaft 2, the blades of the large mixing paddle 5 are arranged close to the edge of the mixing drum 1, and the blades of the small mixing paddle 6 are arranged close to the mixing shaft 2, and the large mixing paddle 5 and the small mixing paddle 6 are arranged in a staggered manner on the driving shaft and the driven shaft. The number of the large mixing paddle 5 and the small mixing paddle 6 are both 4, which are evenly distributed on the mixing shaft 2, further improving the mixing effect and preventing the concrete from sticking to the shaft. The blades of the small mixing paddle 6 are arranged at an angle of 45° relative to the mixing shaft 2, further preventing the concrete from sticking to the shaft.

[0019] like Figure 3As shown, a sealing assembly is provided at the connection position between the stirring shaft 2 and the stirring drum 1. The sealing assembly includes a fixing seat 7 and a pressure cover 8 which are sleeved on the stirring shaft 2. The fixing seat 7 is annular as a whole, and has a large flange at the front end of the outer wall. The large flange is fixedly connected to the side wall of the stirring drum 1. An annular groove is provided on the inner wall of the fixing seat 7, and a sealing filler 9 is provided in the annular groove. The rear end of the pressure cover 8 is inserted into the annular groove and abuts against the sealing filler 9. The front end of the pressure cover 8 has a small flange, and the connecting bolt 10 passes through the small flange and is threadedly connected to the fixing seat 7. The number of sealing fillers 9 in the annular groove is three groups to ensure the sealing effect. The sealing assembly has a simple structure and is easy to connect. It can effectively prevent material leakage from the inside, greatly improves the reliability of the seal, and reduces the frequency of maintenance and the maintenance cost.

[0020] like Figure 4 As shown, the bottom of the mixing drum 1 is symmetrically double-arc shaped, which reduces the mixing dead zone, and a discharge port is provided at the position where the two arcs are connected. A double-opening discharge door is hinged at the discharge port, and the double-opening discharge door is connected to the driving assembly. By adopting the double-opening discharge door, the material can be discharged faster, the unloading time can be reduced, and the production efficiency can be improved.

[0021] Specifically, the double-opening unloading door includes a pair of symmetrically arranged arc-shaped plates 11, the roots of the arc-shaped plates 11 are hinged to the mounting seat 12 arranged at the bottom of the mixing drum 1, and the driving assembly includes a first short connecting rod 13, a second short connecting rod 14, a long connecting rod 15, a cylinder 16, an articulated seat 17, a first transmission rod 18 and a second transmission rod 19. One end of the first short connecting rod 13 and the second short connecting rod 14 are respectively fixedly connected to the roots of the arc-shaped plates 11, and the other ends of the first short connecting rod 13 and the second short connecting rod 14 are respectively hinged to the two ends of the long connecting rod 15, and one end of the long connecting rod 15 is also hinged to the second transmission rod 19, and the other end of the second transmission rod 19 is also hinged to the cylinder 16 lifting and retracting rod and the first transmission rod 18. The top of the cylinder 16 is hinged to the side wall of the mixing drum 1, and the other end of the first transmission rod 18 is hinged to the articulated seat 17, and the articulated seat 17 is fixed to the bottom side of the mixing drum 1 bracket. A pair of arc-shaped plates 11 are driven to open and close simultaneously by a driving assembly, and the structural design is ingenious and cost-saving. The end of the arc-shaped plate 11 is provided with an elastic part 11A. When the driving assembly drives the arc-shaped plate 11 to open and enter the unloading state, the elastic part 11A at the end is slightly deformed under the action of concrete, which can increase the unloading speed and reduce the retention of concrete in the elastic part 11A. In addition, during the process of the driving assembly driving the arc-shaped plate 11 to close, the concrete residue on the elastic part 11A can be further reduced by moderate squeezing of the ends of the pair of arc-shaped plates 11. Moreover, when the unloading door is in the closed state, under the action of the cylinder 16, the elastic parts 11A of the pair of arc-shaped plates 11 are in abutting and closed state, and there will be no leakage. Even if the elastic part 11A at the end of the arc-shaped plate 11 is slightly moved downward by the pressure of the material, the pair of elastic parts 11A will be squeezed against each other due to interference during the downward movement, which further avoids leakage.

[0022] The twin-horizontal-shaft concrete mixer of the utility model has the following advantages:

[0023] (1) By improving the mixing structure, the effective mixing area is enlarged and the concrete is not easy to stick to the shaft and form lumps, which can effectively improve the mixing quality and mixing effect while reducing energy consumption.

[0024] (2) By improving the sealing structure of the stirring shaft, the sealing reliability is improved, the maintenance frequency is reduced, and the maintenance cost is reduced.

[0025] (3) By improving the unloading structure, a cylinder drives the connecting rod to move and controls the opening and closing of the double-leaf unloading door at the same time, thereby reducing the material cost and energy consumption of the mixer. At the same time, by improving the structure of the double-leaf unloading door, the unloading efficiency and unloading effect are improved, and leakage can be effectively avoided.

[0026] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A twin-horizontal-shaft concrete mixer, comprising a mixing drum, wherein two mixing shafts are arranged in parallel in the mixing drum, characterized in that: The stirring shaft includes a driving shaft and a driven shaft, the driving shaft is connected to a driving device arranged at the front end of the stirring drum, the driving shaft and the driven shaft are connected through a gear transmission device arranged at the rear end of the stirring drum, a large stirring paddle and a small stirring paddle are arranged at intervals on the stirring shaft, the blades of the large stirring paddle are arranged close to the edge of the stirring drum, the blades of the small stirring paddle are arranged close to the stirring shaft, and the large stirring paddle and the small stirring paddle are staggered on the driving shaft and the driven shaft.

2. The twin-horizontal-shaft concrete mixer according to claim 1, characterized in that: A sealing assembly is provided at the connection position between the stirring shaft and the stirring drum, and the sealing assembly includes a fixing seat and a pressure cover which are sleeved on the stirring shaft. The fixing seat is in an annular shape as a whole, and has a large flange at the front end of the outer wall. The large flange is fixedly connected to the side wall of the stirring drum. An annular groove is provided on the inner wall of the fixing seat, and a sealing filler is provided in the annular groove. The rear end of the pressure cover is inserted into the annular groove and abuts against the sealing filler. The front end of the pressure cover has a small flange, and the connecting bolt passes through the small flange and is threadedly connected to the fixing seat.

3. The twin-horizontal-shaft concrete mixer according to claim 1, characterized in that: The bottom of the mixing drum is in a symmetrical double arc shape, and a discharge port is provided at the position where the two arcs are connected. A split discharge door is hinged at the discharge port position, and the split discharge door is connected to the driving assembly.

4. The twin-horizontal-shaft concrete mixer according to claim 3, characterized in that: The double-opening unloading door includes a pair of symmetrically arranged arc-shaped plates, the roots of the arc-shaped plates are hinged to a mounting seat arranged at the bottom of the mixing drum, the driving assembly includes a first short connecting rod, a second short connecting rod, a long connecting rod, a cylinder, a hinge seat, a first transmission rod and a second transmission rod, one end of the first short connecting rod and the second short connecting rod are respectively fixedly connected to the roots of the arc-shaped plates, the other ends of the first short connecting rod and the second short connecting rod are respectively hinged to the two ends of the long connecting rod, and one end of the long connecting rod is also hinged to the second transmission rod, the other end of the second transmission rod is also hinged to the cylinder lifting and retracting rod and the first transmission rod, the top of the cylinder is hinged to the side wall of the mixing drum, and the other end of the first transmission rod is hinged to the hinge seat.

5. The twin-horizontal-shaft concrete mixer according to claim 4, characterized in that: The end of the arc-shaped plate is provided with an elastic portion.

6. The twin-horizontal-shaft concrete mixer according to any one of claims 1 to 5, characterized in that: The number of the large stirring paddles and the number of the small stirring paddles are both 4, which are evenly distributed on the stirring shaft.

7. The twin-horizontal-shaft concrete mixer according to any one of claims 1 to 5, characterized in that: The blades of the small stirring paddle are arranged to be inclined at 45° relative to the stirring shaft.

8. The twin-horizontal-shaft concrete mixer according to claim 2, characterized in that: The number of sealing packings in the annular groove is three groups.

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