Concrete premixing device and process

Abstract

The invention discloses a concrete pre-stirring device and process, and relates to the field of concrete preparation, the concrete pre-stirring device comprises a cylinder, a first stirring rod, a first stirring blade, a driving motor, a feed port, a discharge port, a second stirring rod and a second stirring blade; the first stirring rod is rotatably arranged in the barrel, the first stirring blade is arranged on the first stirring rod, the driving motor is arranged on the barrel and used for driving the first stirring rod to rotate, the feeding port is formed in the top wall of the barrel, a conical discharging part is formed in the lower side of the barrel, and the discharging port is formed in the lower side of the conical discharging part. The second stirring rod is located at the conical discharging part and arranged at the lower end of the first stirring rod in a lifting mode, the second stirring rod and the first stirring rod coaxially rotate, and the second stirring blade is arranged on the second stirring rod. The concrete mixing device is beneficial to improving the concrete mixing effect and ensuring the discharging efficiency.

Description

Technical Field

[0001] The present application relates to the field of concrete preparation, and in particular to a concrete premixing device and process. Background Art

[0002] Ready-mixed concrete refers to a concrete mixture made of cement, aggregate, water, and admixtures and mineral admixtures as needed, which is measured and mixed in a certain proportion and then sold and transported to the place of use within a specified time by a transport vehicle.

[0003] At present, concrete mixing is carried out in mixing tanks. Figure 1 The mixing tank is provided with a cylindrical barrel 1 and a conical discharge portion 14 arranged at the lower side of the barrel 1. The conical discharge portion 14 is convenient for unloading. A stirring rod is rotatably arranged in the barrel 1 to mix and stir the concrete.

[0004] In practice, the stirring rod will not penetrate into the conical discharge part, but when the raw materials are put into the mixing tank, some of the raw materials will settle and accumulate in the conical discharge part, and the stirring rod has little stirring effect on the conical discharge part, affecting the quality of the concrete. Even if the stirring rod penetrates into the conical discharge part to stir and mix the concrete there, the stirring blades at the lower end of the stirring rod will block the concrete to a certain extent at this point during discharge, affecting the discharge efficiency. Summary of the invention

[0005] In order to improve the mixing effect of concrete and ensure the unloading efficiency, the present application provides a concrete premixing device and process.

[0006] The present application provides a concrete premixing device and process using the following technical solutions: A concrete premixing device comprises a cylinder, a first stirring rod, a first stirring blade, a driving motor, a feeding port, a discharging port, a second stirring rod and a second stirring blade; the first stirring rod is rotatably arranged in the cylinder, the first stirring blade is arranged on the first stirring rod, the driving motor is arranged on the cylinder and is used to drive the first stirring rod to rotate, the feeding port is opened on the top wall of the cylinder, a conical discharge portion is formed on the lower side of the cylinder, the discharging port is opened on the lower side of the conical discharge portion, the second stirring rod is located at the conical discharge portion and is lifted and lowered at the lower end of the first stirring rod, the second stirring rod rotates coaxially with the first stirring rod, and the second stirring blade is arranged on the second stirring rod.

[0007] By adopting the above technical scheme, a variety of raw materials are put into the cylinder from the feed port, the driving motor drives the first stirring rod to rotate, and the first stirring rod synchronously drives the second stirring rod to rotate, so as to realize the rotation of the first stirring blade and the second stirring blade, and the second stirring blade stirs the conical discharge part, thereby ensuring the mixing effect of the concrete; when discharging, the second stirring rod rises and moves upward from the conical discharge part, which will not hinder the concrete, that is, the discharging efficiency is guaranteed; that is, through the premixing device of the present application, the mixing effect of the concrete is guaranteed without affecting the discharging efficiency.

[0008] Preferably, a plug-in groove is provided in the first stirring rod, and the second stirring rod is plugged into and slidably matched with the plug-in groove. A limiting groove is also provided on the inner wall of the first stirring rod, and a limiting block that slidably cooperates with the limiting groove is formed on the circumference of the second stirring rod. A driving cylinder is installed in the first stirring rod, and the driving cylinder is arranged vertically downward, and the end of the piston rod is connected to the upper end of the second stirring rod. A sealing member for sealing the plug-in groove is provided on the first stirring rod.

[0009] By adopting the above technical scheme, the plug-in sliding cooperation between the plug-in groove and the second stirring rod can realize the lifting and sliding cooperation of the second stirring rod relative to the first stirring rod. Through the cooperation between the limit groove and the limit block, the coaxial rotation cooperation of the first stirring rod and the second stirring rod can be realized; the lifting and lowering action of the second stirring rod is realized under the drive of the driving cylinder.

[0010] Preferably, the sealing member is configured as a sealing ring gasket, an embedding groove is provided on the inner wall of the plug-in groove, the sealing ring gasket is embedded in the embedding groove, an abutment ring gasket is also integrally formed on the inner side of the sealing ring gasket, a friction portion is formed on the side of the abutment ring gasket close to the second stirring rod, and an arc-shaped spring piece is provided in the abutment ring gasket, which can bend in both directions and maintain a bending posture; when the second stirring rod is in a descending state, the middle part of the arc-shaped spring piece is in an upward bending state, and when the second stirring rod is in an ascending state, the middle part of the arc-shaped spring piece is in a downward bending state.

[0011] By adopting the above technical scheme, the abutting ring pad on the sealing ring pad abuts against the second stirring rod, thereby realizing the sealing of the plug-in groove, which can prevent concrete from entering the plug-in groove and affecting the lifting and lowering action of the second stirring rod; when the second stirring rod is in a descending state, the middle part of the arc-shaped spring piece bends upward, and when the second stirring rod rises, under the action of the friction part between the second stirring rod and the abutting ring pad, the middle part of the arc-shaped spring piece is gradually driven to bend downward, that is, the end of the abutting ring pad close to the second stirring rod is tilted upward, which can help to reduce the friction force of the friction part and the second stirring rod, and ensure the sliding smoothness of the second stirring rod; because when the second stirring rod rises, the concrete in the cylinder will produce resistance to the second stirring blade, that is, it will produce resistance to the rising of the second stirring rod. At the same time, if the arc-shaped spring piece remains in an upwardly bent state, the end of the abutting ring pad will bend downward at this time, which will also produce resistance to the second stirring rod. The double resistance will have a greater impact on the rising of the second stirring rod, that is, it will cause a greater load on the cylinder and affect the service life.

[0012] Preferably, the second stirring rod is provided with an abutment ring groove, a plug-in rod is arranged on the top wall of the abutment ring groove, a plug-in hole is provided on the abutment ring pad, and the opening of the plug-in hole is flared, the plug-in rod is arranged at an angle, and is inclined from top to bottom away from the axis of the second stirring rod.

[0013] By adopting the above technical scheme, when the second stirring rod is in a descending state, the end of the abutting ring pad is located in the abutting ring groove, and the plug-in rod is plugged and matched with the plug-in hole. The abutting ring pad is fixed and positioned by the cooperation of the plug-in rod and the plug-in hole. At this time, the abutting ring pad is in an upward bending state, preventing the pressure of the concrete from acting on the abutting ring pad, causing the arc-shaped spring sheet to be further bent, and finally causing the sealing effect to decrease; when the second stirring rod rises, under the action of the bottom wall of the abutting ring groove, the end of the abutting ring pad will be driven to gradually tilt upward, and finally the abutting ring pad will be bent downward. When the plug-in rod is disengaged from the plug-in hole, the abutting ring pad tilts upward, so that the shape of the plug-in hole can adapt to the disengagement trajectory of the plug-in rod, thereby facilitating the smooth disengagement of the plug-in rod and the plug-in hole; when the second stirring rod is descended, the abutting ring pad changes from a downward bending state to an upward bending state, and then the end of the abutting ring pad can smoothly enter the abutting ring groove, because the hole opening of the plug-in hole is expanded, thereby facilitating the smooth plugging of the plug-in rod therewith.

[0014] Preferably, there are multiple abutment ring gaskets, and they are distributed on the inner side of the sealing ring gasket in the vertical direction; there are multiple abutment ring grooves corresponding to the number of abutment ring gaskets, and all of the abutment ring grooves are provided with plug-in rods, and the plug-in rods in different abutment ring grooves are staggered in the vertical direction, and the positions of the plug-in holes on the abutment ring gaskets correspond to the positions of the corresponding plug-in rods.

[0015] By adopting the above technical solution, multiple abutment ring pads are arranged to abut against the second stirring rod, which helps to improve the sealing between the second stirring rod and the first stirring rod; all the connecting rods are staggered in the vertical direction to ensure that the corresponding abutment ring pads are smoothly connected to the corresponding connecting rods.

[0016] Preferably, the sealing device is a sealing diaphragm, which is in the shape of a truncated cone with a larger upper portion and a smaller lower portion, wherein the upper end of the sealing diaphragm is connected to the lower end of the first stirring rod, and the lower end of the sealing diaphragm is connected to the second stirring rod.

[0017] By adopting the above technical solution, sealing is performed through a sealing diaphragm, and the sealing diaphragm is not located in the plug-in groove, thereby ensuring that the lifting and sliding movement between the second stirring rod and the first stirring rod is smoother; if the seal is directly arranged in the plug-in groove, the friction between the second stirring rod and the first stirring rod will be relatively large, and the concrete will also produce resistance to the rise of the second stirring rod, thereby causing the load on the second stirring rod to rise to be relatively large, which will eventually lead to a reduction in the service life of the cylinder.

[0018] Preferably, a contact rod is hingedly connected to the lower side of the first stirring rod through a torsion spring, and the contact rod is located in the sealing diaphragm. In an initial state, the contact rod is inclined and inclined toward the axis of the second stirring rod, and a smooth portion is formed at the end of the contact rod; a connecting block is provided on the second stirring rod, the lower end of the sealing diaphragm is connected to the lower side of the connecting block, and an inclined guiding portion is formed on the upper side of the connecting block; when the second stirring rod rises, under the action of the sealing diaphragm, the smooth portion of the contact rod abuts against the second stirring rod, and when the second stirring rod rises, under the action of the inclined guiding portion, the contact rod will gradually move to the lower side of the connecting block.

[0019] By adopting the above technical solution, a mixing operation is performed, at which time the second stirring rod is in a descending state. At this time, under the pressure of the concrete, the sealing diaphragm approaches the second stirring rod and drives the abutting rod to abut against the second stirring rod; when unloading is required, the second stirring rod rises, and the gap between the second stirring rod and the plug-in groove is matched, that is, only the resistance of the concrete remains. Since the sealing diaphragm can block the concrete to a certain extent, that is, the concrete is not completely filled on the circumference of the second stirring rod, the resistance of the concrete to the second stirring rod can also be reduced, thereby ensuring the smooth rise of the second stirring rod, greatly reducing the load during the rise, and improving the service life of the second stirring rod and the driving cylinder; when the second stirring rod rises, the smooth part of the abutting rod will fall relative to the second stirring rod, and when the smooth part of the abutting rod moves to the inclined guide part, it will gradually move to the lower side of the connecting block along the inclined guide part, and when the second stirring rod rises, the sealing diaphragm will be driven to move upward, and will also give the abutting rod and the second stirring rod a force to stick tightly. In addition, under the pressure of the concrete, it will also act on the abutting rod The abutment rod is in contact with the outer wall of the second stirring rod, which can hinder the concrete on the surrounding side of the second stirring rod when the second stirring rod rises, and can prevent the concrete from adhering to the surrounding side of the second stirring rod and moving with it to the insertion groove. If there are particles of a certain size entering the insertion groove, it will cause blockage, which greatly affects the lifting and sliding of the second stirring rod and the first stirring rod; and when the second stirring rod rises, the sealing diaphragm will have friction sliding relative to the end of the abutment rod. Because the discharge port will be opened synchronously when the second stirring rod rises, the pressure of the concrete will be greatly reduced at this time, and because the sealing diaphragm on the outside of the abutment rod will be in a relaxed state before the second stirring rod ends, the abutment rod has a tendency to rotate outward and reset under the action of the torsion spring, but under the friction of the sealing diaphragm, it will drive the abutment rod to move continuously toward the inner wall, and because the concrete will also play a certain blocking force on the lower side, that is, the abutment rod will not reset, and due to the reset trend, it will not abut against the second stirring rod under the movement of the sealing diaphragm, that is, it will not affect the movement of the sealing diaphragm.

[0020] Preferably, the sealing diaphragm is made of rubber material.

[0021] A concrete premixing process, using the above-mentioned premixing device, comprises the following steps: S1: Add raw materials into the cylinder; S2: The first stirring rod and the second stirring rod rotate synchronously to perform mixing and stirring; S3: After the stirring is completed, the discharge port is opened to discharge the material; In step S3, while the discharge port is opened for unloading, the second stirring rod rises.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The second stirring rod can be lifted and lowered. When mixing, the second stirring rod goes deep into the conical discharge part to stir and mix the concrete to ensure the mixing effect. When discharging, the second stirring rod rises and comes out of the conical discharge part, which does not hinder the concrete and ensures the discharging efficiency. 2. The plug-in groove is sealed by means of the abutting ring gasket on the sealing ring gasket to prevent concrete from entering the plug-in groove and affecting the lifting and sliding of the second stirring rod. The arc-shaped spring piece in the abutting ring gasket can bend adaptively when the second stirring rod rises or falls, thereby reducing the friction between the abutting ring gasket and the second stirring rod, thereby reducing the lifting load of the second stirring rod and prolonging the service life of the cylinder and the second stirring rod; 3. Sealing is performed by a sealing diaphragm, and the clearance between the second stirring rod and the plug-in slot is matched, which greatly reduces the resistance to sliding between the second stirring rod and the plug-in slot, ensuring the service life of the device, and when the second stirring rod rises, the abutment rod abuts against its outer wall, which can block the concrete and prevent the concrete from entering the plug-in slot with the second stirring rod to cause blockage, further ensuring the smoothness of sliding between the second stirring rod and the first stirring rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a premixing device in the related art; Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of the present application; Figure 3 This is a schematic cross-sectional structural diagram of the first stirring rod in the first embodiment of the present application; Figure 4 for Figure 3 A partial enlarged view of A in the figure, and is located in a state where the second stirring rod is in a descending state; Figure 5 This is a state diagram mainly showing the second stirring rod in the ascending state abutting against the ring pad in the first embodiment of the present application; Figure 6 This is a schematic diagram mainly showing the plug-in rod in the second embodiment of the present application; Figure 7 This is a schematic diagram mainly showing a plurality of abutment ring pads in the third embodiment of the present application; Figure 8 This is a partial structural diagram of the fourth embodiment of the present application, which mainly reflects the structure of the sealing diaphragm; Fig. 9 for Figure 8 A partial enlarged view of B in the middle; Fig.10 for Figure 8 A partial enlarged view of middle C; Fig.11 This is a diagram showing the state of the sealing diaphragm and the abutting rod when the second stirring rod starts to rise under the concrete pressure; Fig.12 This is a diagram showing a state in which the abutment rod moves onto the connection block, which is mainly reflected in the fourth embodiment of the present application; Fig.13 This is a diagram mainly showing the state in which the abutment rod moves to the lower side of the connecting block in the fourth embodiment of the present application.

[0024] 1. Cylinder; 11. Feed inlet; 12. Discharge outlet; 13. Top cover; 14. Conical discharge part; 2. First stirring rod; 21. First stirring blade; 22. Insertion groove; 23. Limiting groove; 24. Mounting plate; 25. Embedding groove; 26. First annular groove; 27. Driving cylinder; 3. Driving motor; 4. Second stirring rod; 41. Second stirring blade; 42. Limiting block; 43. Connecting block; 431. Second annular groove; 432. Inclined guide part; 5. Sealing ring gasket; 51. Abutting ring gasket; 511. Friction part; 512. Insertion hole; 6. Arc-shaped spring piece; 7. Abutting annular groove; 71. Insertion rod; 8. Sealing diaphragm; 9. Abutting rod; 91. Smooth part. DETAILED DESCRIPTION

[0025] The following is combined with Figure 2 -Attached Fig.13 This application is described in further detail.

[0026] The embodiment of the present application discloses a concrete premixing device.

[0027] Example 1 Reference Figure 2 The concrete premixing device comprises a cylinder 1, a first stirring rod 2, a first stirring blade 21, a driving motor 3, a feed port 11, a discharge port 12, a second stirring rod 4 and a second stirring blade 41. A top cover 13 is provided on the upper side of the cylinder 1, the second stirring rod 4 is rotatably connected to the top cover 13, the driving motor 3 is transmission-connected to the upper end of the second stirring rod 4 through a pulley structure, and the feed port 11 is provided on the top cover 13; a conical discharge portion 14 is formed on the lower side of the cylinder 1, the discharge port 12 is provided on the lower side of the conical discharge portion 14, the second stirring rod 4 is lifted and arranged at the lower end of the first stirring rod 2, and the second stirring rod 4 rotates coaxially with the first stirring rod 2, the second stirring rod 4 is used to stir the concrete at the conical discharge portion 14, the first stirring blade 21 is provided on the first stirring rod 2, and the second stirring blade 41 is provided on the second stirring rod 4.

[0028] A variety of raw materials are put into the cylinder 1 from the feed port 11, and the driving motor 3 drives the first stirring rod 2 to rotate, and the first stirring rod 2 synchronously drives the second stirring rod 4 to rotate to achieve mixing and stirring of the concrete. When unloading, the second stirring rod 4 rises and moves upward from the conical discharge part 14, which will not hinder the concrete. In the prior art, the stirring rod of the concrete mixing device cannot penetrate into the conical discharge part 14, resulting in part of the raw materials being precipitated and accumulated in the conical discharge part 14, affecting the quality of the concrete. By setting the conical discharge part 14 on the lower side of the cylinder 1, and setting the second stirring rod 4 and the second stirring blade 41 at the conical discharge part 14, the first stirring rod 2 and the second stirring rod 4 rotate coaxially, ensuring that the concrete is fully stirred at the conical discharge part 14, and solving the problem of raw material precipitation. The second stirring rod 4 rises, which will not hinder the concrete, thereby ensuring the unloading efficiency.

[0029] Reference Figure 2 , Figure 3 and Figure 4 The first stirring rod 2 is provided with a plug-in slot 22, the second stirring rod 4 is plugged into and slidably matched with the plug-in slot 22, the second stirring rod 4 and the plug-in slot 22 form a clearance fit, and a limiting slot 23 is also provided on the inner wall of the first stirring rod 2, and a limiting block 42 is formed on the circumference of the second stirring rod 4 to slidably match with the limiting slot 23. The lifting action of the second stirring rod 4 is realized by the plug-in and slidable fit of the second stirring rod 4 and the plug-in slot 22, and the coaxial rotation of the second stirring rod 4 and the first stirring rod 2 is realized under the cooperation of the limiting block 42 and the limiting slot 23.

[0030] A mounting plate 24 is installed in the first stirring rod 2, and a driving cylinder 27 is installed on the mounting plate 24. The driving cylinder 27 is arranged vertically downward, and the piston rod end of the driving cylinder 27 is fixedly connected to the upper end of the second stirring rod 4. The lifting action of the second stirring rod 4 can be realized by the operation of the driving cylinder 27.

[0031] Specifically, the first stirring rod 2 is composed of two sections. After one section is formed, the mounting plate 24 equipped with the driving cylinder 27 is welded inside the first stirring rod 2. After the installation is completed, the two sections of the first stirring rod 2 are docked and welded to realize the installation of the driving cylinder 27.

[0032] Reference Figure 3 , Figure 4 and Figure 5 A sealing member for sealing the insertion groove 22 is provided on the first stirring rod 2 to prevent concrete from entering the insertion groove 22 and hindering the lifting and sliding of the second stirring rod 4.

[0033] In this embodiment, the sealing member is configured as a sealing ring gasket 5, which is made of rubber. An embedding groove 25 is provided on the inner wall of the plug-in groove 22. The sealing ring gasket 5 is embedded in the embedding groove 25. An abutting ring gasket 51 is integrally formed on the inner side of the sealing ring gasket 5. A friction portion 511 is formed on the side of the abutting ring gasket 51 close to the second stirring rod 4. An arc-shaped spring piece 6 that can be bent in both directions and maintain a bent posture is provided in the abutting ring gasket 51. There are multiple arc-shaped spring pieces 6, which are distributed in the abutting ring gasket 51 at intervals. The abutting ring gasket 51 and the arc-shaped spring piece 6 are manufactured by a filling process. When the second stirring rod 4 is in a descending state, the middle part of the arc-shaped spring piece 6 is in an upward bending state, and when the second stirring rod 4 is in an ascending state, the middle part of the arc-shaped spring piece 6 is in a downward bending state. The arc-shaped spring piece 6 supports the abutting ring gasket 51, blocks the pressure of the concrete on the abutting ring gasket 51, and prevents the abutting ring gasket 51 from further bending, resulting in a decrease in the sealing effect.

[0034] The sealing ring gasket 5 seals the plug-in groove 22. When the second stirring rod 4 is in a descending state, the arc-shaped spring piece 6 is in an upward bending state, that is, at this time, the end of the abutting ring gasket 51 is tilted downward. When the second stirring rod 4 rises, the second stirring rod 4 and the friction portion 511 act to drive the bending state of the arc-shaped spring piece 6 to gradually change, that is, the middle part of the arc-shaped spring piece 6 gradually bends downward. At this time, the end of the abutting ring gasket 51 is tilted upward. In practice, if the end of the abutting ring gasket 51 is always in a downward tilting state, then when the second stirring rod 4 rises, the end of the abutting ring gasket 51 will have a tendency to move upward, that is, the abutting ring gasket 51 has a tendency to gradually transition to a straightened state. In this process, the positive pressure of the abutting ring gasket 51 on the second stirring rod 4 will increase, resulting in the second stirring rod 4 and The friction between the abutting ring pads 51 increases, and the end of the abutting ring pads 51 in the present application can be bent upwards eventually. After bending upwards, the positive pressure of the abutting ring pads 51 on the second stirring rod 4 will become smaller again, which is convenient for the smooth rise of the second stirring rod 4. That is, in the present application, due to the change in the bending state of the abutting ring pads 51, the friction will only increase instantaneously during the change process, and will not have a significant impact on the rise of the second stirring rod 4, thereby ensuring the smooth rise of the second stirring rod 4; and when the second stirring rod 4 rises, the concrete will also hinder the second stirring blade 41, that is, hinder the rise of the second stirring rod 4, so the change in the bending state of the abutting ring pads 51 will not generate a large friction force on the second stirring rod 4, which can reduce the load of the second stirring rod 4 when it rises, and improve the service life. Similarly, when descending, the abutting ring pads 51 gradually bend upwards, that is, its end is tilted downward, to prevent the increase of the load of the second stirring rod 4 when it descends, which helps to improve the service life.

[0035] The design of the arc-shaped spring piece 6 enables the abutment ring pad 51 to adapt to the lifting and lowering action of the second stirring rod 4, preventing the additional friction force from being increased, and ensuring the smooth sliding of the second stirring rod 4. The abutment ring pad 51 realizes the conversion of the bending state under the action of the second stirring rod 4, further ensuring the sealing effect and the smoothness of operation. The principle that the arc-shaped spring piece 6 can maintain the bending state is the same as the principle of the hairpin, and can be bent in both directions and maintain the bending state.

[0036] The implementation principle of a concrete premixing device in an embodiment of the present application is as follows: when mixing concrete, the second mixing rod 4 rotates synchronously with the first mixing rod 2 to mix the conical discharge portion 14 to ensure the mixing effect; after mixing, discharging is carried out, and when discharging, the second mixing rod 4 rises and is not blocked at the conical discharge portion 14, which helps to ensure the discharging effect; the first mixing rod 2 and the second mixing rod 4 are sealed by a sealing ring gasket 5, wherein the abutting ring gasket 51 can realize the conversion of the bending state under the action of the second mixing rod 4, further ensuring the sealing effect and the smoothness of operation.

[0037] Example 2 Reference Figure 6 The difference between this embodiment and embodiment 1 is that a contact ring groove 7 is provided on the second stirring rod 4, a plug-in rod 71 is fixedly connected to the top wall of the contact ring groove 7, a plug-in hole 512 is provided on the upper side of the contact ring pad 51, the opening of the plug-in hole 512 is flared, the plug-in rod 71 is inclined, and is inclined from top to bottom toward the axial direction away from the second stirring rod 4.

[0038] When the second stirring rod 4 is in the descending state, the end of the abutting ring gasket 51 is located in the abutting ring groove 7, and the plug-in rod 71 is plugged into the plug-in hole 512 to fix and position the abutting ring gasket 51. This prevents concrete from entering the plug-in groove 22 and generating pressure on the abutting ring gasket 51, causing the abutting ring gasket 51 to bend further, resulting in a decrease in the sealing effect, that is, the arc-shaped spring piece 6 can further improve the reliability of the seal.

[0039] When the second stirring rod 4 gradually descends, the bending state of the abutment ring pad 51 gradually changes, and the abutment ring pad 51 abuts against the outer wall of the second stirring rod 4, and the bending degree is relatively large. When the abutment ring pad 51 enters the abutment ring groove 7, the bending state of the abutment ring pad 51 is released, that is, the bending state becomes smaller. During the bending state change process, the plug-in rod 71 will abut against the upper surface of the abutment ring pad 51, and gradually enter the plug-in hole 512 when the bending state of the abutment ring pad 51 changes.

[0040] Example 3 Reference Figure 7The difference between this embodiment and embodiment 2 is that a plurality of abutment ring pads 51 are provided, which are arranged at intervals along the vertical direction on the inner side of the sealing ring pad 5, the number of abutment ring grooves 7 is the same as the number of abutment ring pads 51 and corresponds one to one, all abutment ring grooves 7 are provided with plug-in rods 71, and the plug-in rods 71 ​​in all abutment ring grooves 7 are staggered in the vertical direction, and the plug-in holes 512 on the abutment ring pads 51 correspond to the positions of the corresponding plug-in rods 71.

[0041] Multiple abutment ring pads 51 abut against the second stirring rod 4, which helps to further improve the sealing between the second stirring rod 4 and the first stirring rod 2, and is suitable for large-scale stirring devices with relatively large internal pressure; all the plug-in rods 71 ​​are staggered in the vertical direction to ensure that the corresponding abutment ring pads 51 are smoothly plugged into the corresponding plug-in rods 71.

[0042] Example 4 Reference Figure 8 The difference between this embodiment and embodiment 1 is that the gap between the plug-in groove 22 and the second stirring rod 4 is larger, the sealing member is configured as a sealing diaphragm 8, the sealing diaphragm 8 is made of rubber material, preferably polyurethane rubber, the sealing diaphragm 8 is in the shape of a truncated cone with a larger upper portion and a smaller lower portion, the upper end of the sealing diaphragm 8 is connected to the bottom of the first stirring rod 2, a connecting block 43 is fixedly connected to the second stirring rod 4, the lower end of the sealing diaphragm 8 is fixedly connected to the connecting block 43, and the size of the plug-in groove 22 is sufficient for the connecting block 43 to enter.

[0043] Reference Figure 8 , Fig. 9 and Fig.10 In practice, a first annular groove 26 is formed at the bottom of the first stirring rod 2, and the upper end of the sealing diaphragm 8 is inserted into the first annular groove 26, and then the upper end of the sealing diaphragm 8 is fixed by passing a bolt through the upper end of the sealing diaphragm 8. The connecting block 43 is annular, and a second annular groove 431 is formed at the lower inner side of the connecting block 43, and the lower end of the sealing diaphragm 8 is inserted into the second annular groove 431, and the bolt passes through the connecting block 43 and the sealing diaphragm 8 in sequence to fix the lower end of the sealing diaphragm 8.

[0044] In the initial state, sealing is performed by the sealing diaphragm 8, and the sealing diaphragm 8 is not located in the plug-in groove 22, thereby ensuring that the lifting and sliding movement between the second stirring rod 4 and the first stirring rod 2 is smoother; if the seal is directly arranged in the plug-in groove 22, the friction between the second stirring rod 4 and the first stirring rod 2 will be relatively large, and the concrete will also produce resistance to the rise of the second stirring rod 4, thereby causing the load of the second stirring rod 4 to rise to be relatively large, which will eventually reduce the service life of the equipment.

[0045] The lower side of the first stirring rod 2 is hinged with an abutting rod 9 through a torsion spring, and the abutting rod 9 is located in the sealing diaphragm 8. There are multiple abutting rods 9 arranged in a circular array along the bottom wall of the first stirring rod 2. In the initial state, the abutting rod 9 is tilted and tilted toward the axis of the second stirring rod 4. The torsion spring causes the abutting rod 9 to rotate away from the second stirring rod 4. A smooth portion 91 is formed at the end of the abutting rod 9. An inclined guide portion 432 is formed on the upper side of the connecting block 43.

[0046] During the mixing operation, the concrete exerts pressure on the sealing diaphragm 8, and the sealing diaphragm 8 is retracted toward the second stirring rod 4 and is in a tensioned state. Fig.11 When the second stirring rod 4 rises, the sealing diaphragm 8 will relax, but under the concrete pressure, the sealing diaphragm 8 will further move toward the second stirring rod 4 until the abutting rod 9 is driven to rotate, and the abutting rod 9 gradually abuts against the second stirring rod 4; refer to Fig.12 and Fig.13 When the abutting rod 9 moves to the inclined guide portion 432, the end of the abutting rod 9 gradually moves to the bottom of the connecting block 43 along the inclined guide portion 432, and at this time, the sealing diaphragm 8 is located at a redundant portion at the lower side of the connecting block 43. When the abutting rod 9 moves to the lower side of the connecting block 43, there will be no large friction between the sealing diaphragm 8 and the abutting rod 9, and the sealing diaphragm 8 can quickly abut against the second stirring rod 4 with the concrete pressure. As the second stirring rod 4 rises, the sealing diaphragm 8 will also gradually move upward. When the sealing diaphragm 8 moves upward, it will generate friction with the abutting rod 9, giving the abutting rod 9 a force to stick to the second stirring rod 4. In addition, under the pressure of the concrete, the abutting rod 9 is also subjected to a force to rotate in the direction close to the second stirring rod 4, which helps to prevent the abutting rod 9 from resetting under the action of the torsion spring. By abutting the outer wall of the second stirring rod 4 with the abutment rod 9, the concrete on its surrounding side can be blocked when the second stirring rod 4 rises, which can prevent the concrete from sticking to the surrounding side of the second stirring rod 4 and moving with it to the insertion groove 22. If particles of a certain size enter the insertion groove 22, it will cause blockage, which will greatly affect the lifting and sliding of the second stirring rod 4 and the first stirring rod 2.

[0047] By setting the sealing diaphragm 8, the gap between the second stirring rod 4 and the plug-in groove 22 is matched, that is, only the resistance of the concrete remains. Because the sealing diaphragm 8 can block the concrete to a certain extent, that is, the concrete is not completely filled on the side of the second stirring rod 4, the resistance of the concrete to the second stirring rod 4 can also be reduced, thereby ensuring the smooth rise of the second stirring rod 4, greatly reducing the load during the rise, and increasing the service life of the second stirring rod 4 and the driving cylinder 27.

[0048] In practice, after the abutment rod 9 detaches from the inclined guide portion 432, the abutment rod 9 does not directly abut against the outer wall of the second stirring rod 4. The abutment rod 9 does not abut against the second stirring rod 4 temporarily under the abutment on the outer peripheral side of the connecting block 43. The abutment rod 9 will not abut against the second stirring rod 4 until it detaches from the connecting block 43. Then, the abutment rod 9 will abut against the second stirring rod 4.

[0049] The present application also discloses a concrete premixing process, which uses the above-mentioned premixing device and includes the following steps: S1: Add raw materials into cylinder 1; S2: The first stirring rod 2 and the second stirring rod 4 rotate synchronously to perform mixing and stirring; S3: After the stirring is completed, the discharge port 12 is opened to discharge the material; In step S3, the second stirring rod 4 rises while the discharge port 12 is opened for unloading.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A concrete premixing device, characterized in that: The invention comprises a barrel (1), a first stirring rod (2), a first stirring blade (21), a driving motor (3), a feeding port (11), a discharging port (12), a second stirring rod (4) and a second stirring blade (41); the first stirring rod (2) is rotatably arranged in the barrel (1), the first stirring blade (21) is arranged on the first stirring rod (2), the driving motor (3) is arranged on the barrel (1) and is used to drive the first stirring rod (2) to rotate; the feeding port (11) is opened on the top wall of the barrel (1); a conical discharge portion (14) is formed on the lower side of the barrel (1); the discharging port (12) is opened on the lower side of the conical discharge portion (14); the second stirring rod (4) is located at the conical discharge portion (14) and is lifted and lowered at the lower end of the first stirring rod (2); the second stirring rod (4) rotates coaxially with the first stirring rod (2); and the second stirring blade (41) is arranged on the second stirring rod (4).

2. A concrete premixing device according to claim 1, characterized in that: The first stirring rod (2) is provided with a plug-in groove (22), the second stirring rod (4) is plugged into and slidably engaged with the plug-in groove (22), a limit groove (23) is also provided on the inner wall of the first stirring rod (2), a limit block (42) is formed on the peripheral side of the second stirring rod (4) and slidably engages with the limit groove (23), a driving cylinder (27) is installed in the first stirring rod (2), the driving cylinder (27) is arranged vertically downward, and the end of the piston rod is connected to the upper end of the second stirring rod (4), and a sealing member for sealing the plug-in groove (22) is provided on the first stirring rod (2).

3. A concrete premixing device according to claim 2, characterized in that: The sealing member is configured as a sealing ring gasket (5), an embedding groove (25) is provided on the inner wall of the plug-in groove (22), the sealing ring gasket (5) is embedded in the embedding groove (25), an abutting ring gasket (51) is integrally formed on the inner side of the sealing ring gasket (5), a friction portion (511) is formed on the side of the abutting ring gasket (51) close to the second stirring rod (4), and an arc-shaped spring piece (6) which can be bent in both directions and maintain a bent posture is provided in the abutting ring gasket (51); when the second stirring rod (4) is in a descending state, the middle part of the arc-shaped spring piece (6) is in an upwardly bent state, and when the second stirring rod (4) is in an ascending state, the middle part of the arc-shaped spring piece (6) is in a downwardly bent state.

4. A concrete premixing device according to claim 3, characterized in that: The second stirring rod (4) is provided with an abutting ring groove (7), a plug-in rod (71) is arranged on the top wall of the abutting ring groove (7), a plug-in hole (512) is provided on the abutting ring pad (51), and the opening of the plug-in hole (512) is in a flared shape, and the plug-in rod (71) is arranged in an inclined manner and is inclined from top to bottom in a direction away from the axis of the second stirring rod (4).

5. A concrete premixing device according to claim 4, characterized in that: The abutment ring gasket (51) is provided in plurality and is distributed on the inner side of the sealing ring gasket (5) in the vertical direction; the abutment ring groove (7) is provided in plurality corresponding to the number of the abutment ring gaskets (51); all the abutment ring grooves (7) are provided with plug-in rods (71); the plug-in rods (71) in different abutment ring grooves (7) are staggered in the vertical direction; the position of the plug-in hole (512) on the abutment ring gasket (51) corresponds to the position of the corresponding plug-in rod (71).

6. A concrete premixing device according to claim 2, characterized in that: The sealing device is a sealing diaphragm (8), which is in the shape of a truncated cone with a larger upper portion and a smaller lower portion. The upper end of the sealing diaphragm (8) is connected to the lower end of the first stirring rod (2), and the lower end of the sealing diaphragm (8) is connected to the second stirring rod (4).

7. A concrete premixing device according to claim 6, characterized in that: The lower side of the first stirring rod (2) is hinged with an abutting rod (9) through a torsion spring, and the abutting rod (9) is located in the sealing diaphragm (8). In the initial state, the abutting rod (9) is inclined and inclined toward the axial direction of the second stirring rod (4), and a smooth portion (91) is formed at the end of the abutting rod (9); a connecting block (43) is provided on the second stirring rod (4), the lower end of the sealing diaphragm (8) is connected to the lower side of the connecting block (43), and an inclined guiding portion (432) is formed on the upper side of the connecting block (43); when the second stirring rod (4) rises, under the action of the sealing diaphragm (8), the smooth portion (91) of the abutting rod (9) abuts against the second stirring rod (4), and when the second stirring rod (4) rises, under the action of the inclined guiding portion (432), the abutting rod (9) will gradually move to the lower side of the connecting block (43).

8. A concrete premixing device according to claim 6, characterized in that: The sealing diaphragm (8) is made of rubber material.

9. A concrete premixing process, using the premixing device as described in any one of claims 1 to 8, characterized in that: The steps include: S1: adding raw materials into the cylinder (1); S2: The first stirring rod (2) and the second stirring rod (4) rotate synchronously to perform mixing and stirring; S3: After the stirring is completed, the discharge port (12) is opened to discharge the material; In step S3, the discharge port (12) is opened to discharge the material, and at the same time, the second stirring rod (4) rises.

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