Shaft-locking-preventing dead-corner-free horizontal concrete mixer

Abstract

The invention discloses an anti-shaft-sticking dead-corner-free horizontal concrete mixer which comprises a mixing barrel, a first mixing shaft, a second mixing shaft, a transmission mechanism and a driving motor, wherein the first mixing shaft and the second mixing shaft are arranged in the mixing barrel; the transmission mechanism and the driving motor are arranged on the outer side of the mixing barrel; the transmission mechanism comprises a first complete gear, a second complete gear, a first half gear, a second half gear and a third half gear, the first complete gear and the first half gear are coaxially and fixedly connected to the extending end of the first stirring shaft, and the second complete gear and the second half gear are coaxially and fixedly connected to the extending end of the second stirring shaft; the first complete gear is always engaged with the second complete gear; and the third half gear is arranged between the first half gear and the second half gear, is driven by the driving motor to continuously rotate in one direction, and is alternately meshed with the first half gear and the second half gear. Synchronous reverse intermittent forward and reverse rotation of the double stirring shafts is achieved through the transmission mechanism, the anti-sticking effect of the stirring shafts is achieved, and meanwhile stirring dead angles are eliminated.

Description

Technical Field

[0001] This invention relates to the field of concrete mixing equipment technology, specifically to a horizontal concrete mixer with anti-shaft seizure and no dead angle. Background Technology

[0002] Horizontal concrete mixers are widely used in concrete production due to their high mixing efficiency and stable mixing quality. However, most existing horizontal concrete mixers use a continuous, unidirectional rotation transmission method for the mixing shaft, resulting in a fixed movement trajectory for the mixing blades. During mixing, concrete materials tend to adhere to, accumulate, and gradually compact along this fixed trajectory, forming a stubborn shaft-seizing phenomenon. This phenomenon not only significantly reduces the mixing and dispersion efficiency of concrete but also significantly increases the rotational resistance of the shaft system, leading to a sharp increase in the load on the drive motor, increased equipment energy consumption, and long-term operation can cause motor overload, accelerated shaft wear, and in severe cases, even shaft jamming and equipment shutdown, increasing maintenance costs and downtime losses. Furthermore, the fixed mixing trajectory limits the movement of concrete materials, easily creating mixing dead zones at the corners of the drum and in the gaps between the mixing shafts. In these dead zone areas, the concrete aggregate and cementitious materials cannot achieve sufficient mixing and dispersion, resulting in uneven proportions and poor workability in the mixed concrete. This directly affects the pouring performance and finished strength of the concrete, making it difficult to meet the requirements of high-precision construction projects. Summary of the Invention

[0003] To solve the above problems, the present invention provides a horizontal concrete mixer with anti-shaft and no dead angle.

[0004] The technical solution adopted in this invention is: A horizontal concrete mixer with anti-shaft and no dead angle includes a mixing drum, a first mixing shaft and a second mixing shaft disposed inside the mixing drum, and a transmission mechanism and a drive motor disposed outside the mixing drum. The transmission mechanism includes a first full gear, a second full gear, a first half gear, a second half gear and a third half gear. The first full gear and the first half gear are coaxially fixed to the extended end of the first mixing shaft, and the second full gear and the second half gear are coaxially fixed to the extended end of the second mixing shaft. The first full gear and the second full gear are always meshed. The third half gear is disposed between the first half gear and the second half gear and is driven by the drive motor to rotate continuously in one direction, alternately meshing with the first half gear and the second half gear.

[0005] Furthermore, in the initial state, the third half gear is engaged with the first half gear and disengaged from the second half gear; when the third half gear rotates clockwise from 0° to 180°, the third half gear disengages from the first half gear and engages with the second half gear; when the third half gear rotates clockwise from 180° to 360°, the third half gear disengages from the second half gear and engages with the first half gear.

[0006] Furthermore, the first half gear, the second half gear, and the third half gear are incomplete spur gears with the same module and number of teeth. The teeth of the first half gear and the third half gear are distributed in the 0-180° region of their circumference, while the teeth of the second half gear are distributed in the 180-360° region of their circumference.

[0007] Furthermore, the meshing tooth ends of the first, second, and third half gears are all rounded and edged.

[0008] Furthermore, the first and second complete gears are complete spur gears with the same module and number of teeth.

[0009] Furthermore, flywheels are fixedly fitted at the extended ends of both the first and second stirring shafts. The flywheels are used to absorb the commutation impact energy and smooth the rotational speed fluctuations of the shaft system.

[0010] Furthermore, the transmission mechanism and flywheel are housed within a protective enclosure.

[0011] Furthermore, the flywheel is located at the end furthest from the drive motor.

[0012] The beneficial effects of this invention are: 1. This invention achieves synchronous reverse and intermittent forward and reverse rotation of the two mixing shafts through a transmission mechanism. It utilizes the reciprocating rotation trajectory to achieve active peeling of the circumferential concrete of the shaft, avoiding long-term unidirectional adhesion and compaction of concrete, structurally reducing concrete adhesion force and reducing the occurrence rate of shaft seizure.

[0013] 2. The transmission mechanism of the present invention adopts a coupling design of full gear and intermittent meshing half gear, which realizes precise fixed-angle synchronous reverse intermittent forward and reverse rotation of the dual stirring shafts under single motor drive, with high rotational stability and small vibration amplitude of the whole machine, avoiding the aggravation of concrete compaction due to vibration.

[0014] 3. The invention has a compact overall structure, reasonable design, and low manufacturing cost; it adopts a pure mechanical transmission structure, which has high reliability and low energy consumption. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the anti-shaft, dead-angle-free horizontal concrete mixer of the present invention.

[0016] Figure 2 This is a diagram showing the connection structure between the first and second complete gears.

[0017] Figure 3 This is a diagram showing the connection structure of the first, second, and third half-gears in their initial state.

[0018] Figure 4This is a diagram showing the connection structure of the first, second, and third half gears after the third half gear rotates 180° clockwise.

[0019] Figure 5 This is a schematic diagram of the rotation angle of the third half gear. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.

[0021] See Figures 1-5 A horizontal concrete mixer with anti-shaft locking includes a mixing drum 11, a first mixing shaft 2 and a second mixing shaft 3 disposed inside the mixing drum 11, and a transmission mechanism, a drive motor and a reducer 10 and a frame (not shown in the figure) disposed outside the mixing drum 11; the first mixing shaft 2 and the second mixing shaft 3 are rotatably mounted on the frame through bearing seats 12, and are driven by the drive motor 10 to rotate synchronously in the forward and reverse directions through the transmission mechanism.

[0022] The transmission mechanism includes a first complete gear 1, a second complete gear 4, a first half gear 5, a second half gear 6, and a third half gear 7. The first complete gear 1 and the first half gear 5 are coaxially fixed to the extended end of the first stirring shaft 2 via a flat key. The first half gear 5 is located outside the first complete gear 1 and close to the drive motor. The second complete gear 4 and the second half gear 6 are coaxially fixed to the extended end of the second stirring shaft 3 via a flat key. The second half gear 6 is located outside the first complete gear 1 and close to the drive motor.

[0023] The first complete gear 1 and the second complete gear 4 are spur gears with the same module and number of teeth. They are always meshed, providing a basic constraint for the synchronous reversal of the dual stirring shafts.

[0024] The third half gear 7 is located between the first half gear 5 and the second half gear 6. The third half gear 7 is connected to the output end of the reducer through a coupling. The input end of the reducer is connected to the output shaft of the drive motor. The drive motor drives the third half gear 7 to rotate continuously clockwise through the reducer.

[0025] The first half gear 5, the second half gear 6, and the third half gear 7 are semi-spur gears with equal module, number of teeth, and tooth width, and their structural dimensions are completely identical. The teeth of the second half gear 6 and the third half gear 7 are distributed in the 0-180° area of ​​their circumference, while the teeth of the first half gear 5 are distributed in the 180-360° area of ​​its circumference. The meshing tooth ends of all three are rounded, and the toothless areas are machined with positioning arc surfaces concentric with the root circle.

[0026] Both the first stirring shaft 2 and the second stirring shaft 3 have a first flywheel 8 and a second flywheel 9 coaxially fixed to their ends away from the drive motor via flanges. Both flywheels 8 and 9 are circular steel discs used to absorb commutation impact energy and smooth shaft speed fluctuations. The rotational inertia of the first flywheel 8 and the second flywheel 9 is selected based on the rated stirring load of the mixer, material characteristics, and the basic inertia of the shaft system, and must be compatible with the rated torque and power of the drive motor. The specific design method is existing technology and will not be elaborated here.

[0027] The first stirring shaft 2 and the second stirring shaft 3 are respectively evenly distributed with first stirring blades 21 and second stirring blades 31, and the first stirring blades 21 and the second stirring blades 31 are arranged in an alternating and opposite manner; the surfaces of the first stirring blades 21 and the second stirring blades 31 as well as the shaft surfaces of the first and second stirring shafts are all coated with a polytetrafluoroethylene wear-resistant and non-stick coating to reduce the adhesion between concrete and the shaft and blades.

[0028] The anti-shaft-seize stirring process in this embodiment is as follows: See Figure 5 , Figure 5 This is a schematic diagram of the rotation angle of the third half gear, as shown below. Figure 5 As shown, when the third half gear rotates clockwise, the starting end of the teeth of the third half gear rotates from the initial position of 0° to 90°, 180°, 270° in sequence, and returns to the initial position after rotating 360°.

[0029] See Figure 3 In the initial state, the teeth of the first half gear 5, the second half gear 6, and the third half gear 7 are located on the same side, that is, to the left of the center of the gear; the third half gear 7 meshes with the first half gear 5 and disengages from the second half gear 6; the first stirring shaft 2 and the second stirring shaft 3 are in the initial zero position, and concrete raw materials are added into the mixing cylinder 1. After the drive motor is reduced in speed by the reducer, it drives the third half gear 7 to rotate 180° clockwise. During this process, the third half gear 7 drives the first half gear 5 to drive the first stirring shaft 2 to rotate 180° counterclockwise around its own axis. Through the meshing of the first complete gear 2 and the second complete gear 4, the second stirring shaft 3 and the second half gear 6 are driven to rotate 180° clockwise around their own axis. The first stirring blade 21 and the second stirring blade 31 rotate in opposite directions synchronously to stir, thereby realizing the radial stirring of the concrete. See Figure 4 When the starting end of the teeth of the third half gear 7 rotates to 180°, the teeth of the first half gear 5, the second half gear 6, and the third half gear 7 are all located on the right side of the gear center; at this time, the third half gear 7 disengages from the first half gear 5 and meshes with the second half gear 6. The third half gear 7 continues to rotate 180° clockwise. During this process, the second half gear 6 drives the second stirring shaft 3 to rotate 180° counterclockwise around its own axis. Through the meshing of the first complete gear 2 and the second complete gear 4, the first stirring shaft 2 and the first complete gear 5 are driven to rotate 180° clockwise around their own axis. The first stirring blade 21 and the second stirring blade 31 rotate synchronously in the forward direction to stir, thereby realizing the radial stirring of the concrete. By continuously repeating the above steps, the transmission mechanism enables the synchronous reverse and intermittent forward and reverse rotation of the two stirring shafts, achieving the effect of preventing the stirring shafts from seizing and eliminating dead zones in the stirring process.

[0030] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A horizontal concrete mixer with anti-shaft seizure and no dead angle, characterized in that, The device includes a stirring cylinder, a first stirring shaft and a second stirring shaft disposed inside the stirring cylinder, and a transmission mechanism and a drive motor disposed outside the stirring cylinder. The transmission mechanism includes a first complete gear, a second complete gear, a first half gear, a second half gear and a third half gear. The first complete gear and the first half gear are coaxially fixed to the extended end of the first stirring shaft, and the second complete gear and the second half gear are coaxially fixed to the extended end of the second stirring shaft. The first complete gear and the second complete gear are always meshed. The third half gear is located between the first half gear and the second half gear. It is driven by a drive motor to rotate continuously in one direction and alternately meshes with the first half gear and the second half gear.

2. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 1, characterized in that, In the initial state, the third half gear is engaged with the first half gear and disengaged from the second half gear; when the third half gear rotates clockwise from 0° to 180°, the third half gear disengages from the first half gear and engages with the second half gear; when the third half gear rotates clockwise from 180° to 360°, the third half gear disengages from the second half gear and engages with the first half gear.

3. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 1, characterized in that, The first, second, and third half gears are incomplete spur gears with the same module and number of teeth. The teeth of the first and third half gears are distributed in the 0-180° region of their circumference, while the teeth of the second half gear are distributed in the 180-360° region of its circumference.

4. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 3, characterized in that, The meshing teeth of the first, second, and third half gears are all rounded and edged.

5. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 1, characterized in that, The first and second complete gears are both fully spur gears with the same module and number of teeth.

6. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 1, characterized in that, Both the extended ends of the first and second stirring shafts are fixedly fitted with flywheels, which are used to absorb the commutation impact energy and smooth the rotational speed fluctuations of the shaft system.

7. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 6, characterized in that, The transmission mechanism and flywheel are housed within a protective enclosure.

8. A horizontal concrete mixer with anti-shaft seizure and no dead angle according to claim 7, characterized in that, The flywheel is located at the end furthest from the drive motor.

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