A concrete mixing shaft assembly

Abstract

This utility model relates to the field of mixing technology, specifically to a concrete mixing shaft assembly, including a rotating shaft having a first circular shaft segment, a regular polygonal shaft segment, and a second circular shaft segment arranged sequentially along the axial direction. Along the axial direction, the projections of the first and second circular shaft segments lie within the projection of the regular polygonal shaft segment. Multiple mixing blades are slidably sleeved on the regular polygonal shaft segment, each blade having a sliding sleeve fitted outside the regular polygonal shaft segment, with adjacent sliding sleeves abutting against each other along the axial direction. The regular polygonal shaft segment has a shoulder at one end near the first circular shaft segment, and a retaining sleeve is detachably fixed on the second circular shaft, the retaining sleeve being circumferentially split. The retaining sleeve and the shoulder can respectively abut against the sliding sleeves on the regular polygonal shaft segment at both ends along the axial direction. The sliding sleeve has a notch communicating with its own inner cavity, the width of which is greater than the diameter of the second circular shaft segment, allowing the second circular shaft segment to enter or disengage from the sliding sleeve through the notch.

Description

Technical Field

[0001] This utility model relates to the field of mixing technology, and in particular to a mixing shaft assembly for concrete. Background Technology

[0002] A twin-shaft concrete mixer combines concrete materials with water to achieve forced mixing. In related technical solutions, the concrete mixer includes a lower casing and an upper cover mounted on the main body, with the lower casing and upper cover forming the internal space of the entire concrete mixer. Two horizontal mixing shafts are installed side-by-side inside the casing.

[0003] In the relevant technical solution, the stirring shaft includes a body that is entirely circular, and the stirring blades include blades and mounting sleeves. The mounting sleeves consist of two semi-circular sleeves that are fitted together on the outside of the circular shaft, and then fixed using multiple sets of bolts and nuts that penetrate the semi-circular sleeves. At this point, the mounting sleeves and stirring blades are fixed to the outside of the rotating shaft. Generally, in order to achieve circumferential limiting of the stirring blades and the circular shaft, a limiting component is also provided between the circular shaft and the mounting sleeves.

[0004] The inventors understood that in the aforementioned technical solution, each mounting sleeve requires multiple bolts and nuts to be fixed to the outside of the round shaft. During prolonged use, the bolt locations are easily blocked or corroded by concrete slurry, making bolt disassembly difficult. This makes it difficult to remove the bolts to replace the mounting sleeve and any damaged mixing blades on it. Utility Model Content

[0005] This invention provides a concrete mixing shaft assembly that can solve at least one of the above-mentioned technical problems.

[0006] To address the aforementioned technical problems, one or more embodiments of this utility model provide a concrete mixing shaft assembly, including a rotating shaft having a first circular shaft segment, a regular polygonal shaft segment, and a second circular shaft segment arranged sequentially along the axial direction. Along the axial direction, the projections of the first and second circular shaft segments lie within the projection of the regular polygonal shaft segment. A plurality of mixing blades are slidably sleeved on the regular polygonal shaft segment, each mixing blade having a sliding sleeve sleeved outside the regular polygonal shaft segment, with adjacent sliding sleeves abutting against each other along the axial direction. The regular polygonal shaft segment has a shoulder at one end near the first circular shaft segment, and a retaining sleeve is detachably fixed on the second circular shaft, the retaining sleeve being circumferentially split. The retaining sleeve and the shoulder can respectively abut against the sliding sleeves on the regular polygonal shaft segment at both ends along the axial direction. The sliding sleeve has a notch communicating with its own inner cavity, the width of which is greater than the diameter of the second circular shaft segment, allowing the second circular shaft segment to enter or disengage from the sliding sleeve through the notch.

[0007] The beneficial effects of one or more of the above technical solutions are as follows:

[0008] In this design, the stirring blades and sliding sleeves are sequentially mounted on a regular polygonal shaft. As a result, the sliding sleeves on the regular polygonal shaft will not rotate relative to the shaft. Multiple sliding sleeves can be stopped and limited along the shaft axis using only the shaft shoulder and the retaining sleeve, which can save the use of multiple bolts.

[0009] Furthermore, in this design, only the retaining sleeve is a split structure, and the retaining sleeve and the second round shaft are detachably fixed. When the retaining sleeve is removed, multiple sliding sleeves can first slide to the second round shaft, and then the second round shaft disengages from the sliding sleeves through the notch, so that the multiple sliding sleeves can be removed from the rotating shaft in sequence. In other words, compared with the traditional method of connecting the two halves of the sliding sleeve with bolts, this design can avoid the situation where the bolts at the sliding sleeve position cannot be removed, thereby avoiding the inability to disassemble and repair damaged blades. Attached image description:

[0010] Figure 1 This is a schematic diagram of the stirring shaft assembly in use in Embodiment 1 of this utility model;

[0011] Figure 2 This is a front view schematic diagram of the overall structure in Embodiment 1 of this utility model;

[0012] Figure 3 This is a schematic diagram of the rotating shaft in Embodiment 1 of this utility model;

[0013] Figure 4 This is a side view of the sliding sleeve disposed on the positive multi-deformation shaft segment in Embodiment 1 of this utility model;

[0014] Figure 5 This is a cross-sectional view of the retaining sleeve in Embodiment 2 of this utility model.

[0015] In the diagram, 1 is the geared motor assembly; 2 is the stirring shaft assembly; 3 is the housing; 21 is the first circular shaft section; 22 is the shaft shoulder; 23 is the sliding sleeve; 231 is the second sliding sleeve; 232 is the first sliding sleeve; 24 is the stirring blade; 251 is the notch; 26 is the bolt; 27 is the retaining sleeve; 271 is the first half-set; 272 is the second half-set; 273 is the connecting plate; 274 is the screw hole; 28 is the second circular shaft section; 281 is the reduced diameter section; and 29 is the regular polygonal shaft section. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0017] Example 1

[0018] See Figures 1-4This embodiment provides a concrete mixing shaft assembly 2, including a rotating shaft having a first circular shaft segment 21, a regular polygonal shaft segment 29, and a second circular shaft segment 28 arranged sequentially along the axial direction. Along the axial direction, the projections of the first circular shaft segment 21 and the second circular shaft segment 28 lie within the projection of the regular polygonal shaft segment 29. A plurality of mixing blades 24 are slidably sleeved on the regular polygonal shaft segment 29, and each mixing blade 24 has a sliding sleeve 23 sleeved outside the regular polygonal shaft segment 29, with adjacent sliding sleeves 23 abutting against each other along the axial direction. The regular polygonal shaft segment 29 has a shoulder 22 at one end near the first circular shaft segment 21, and a retaining sleeve 27 is detachably fixed on the second circular shaft, the retaining sleeve 27 being circumferentially split. The retaining sleeve 27 and the shoulder 22 can respectively abut against the sliding sleeves 23 on the regular polygonal shaft segment 29 at both ends along the axial direction. The sliding sleeve 23 has a notch 251 that communicates with its own inner cavity. The width of the notch 251 is greater than the diameter of the second round shaft segment 28, so that the second round shaft segment 28 can enter or leave the sliding sleeve 23 through the notch 251.

[0019] See Figure 1 The concrete mixing equipment includes a casing 3, a geared motor assembly 1 is provided on the outside of the casing 3, and a mixing shaft assembly 2 is installed inside the casing 3. One end of the mixing shaft assembly 2 extends out of the casing 3 and is connected to the geared motor assembly 1, thereby realizing the input of its own power.

[0020] For details, see Figure 2 To reduce the length of a single sliding sleeve 23 and facilitate the installation of the stirring blade 24, the sliding sleeve 23 in this embodiment is divided into a first sliding sleeve 232 and a second sliding sleeve 231, which are arranged alternately. The length of the first sliding sleeve 232 is greater than the length of the second sliding sleeve 231. The stirring blade 24 is installed on the first sliding sleeve 232, while the stirring blade 24 is not installed on the second sliding sleeve 231.

[0021] More specifically, the stirring blade 24 can be fixed to the first sliding sleeve 232 by welding, integral molding or bolt connection 26, which can be set by those skilled in the art.

[0022] In this embodiment, the regular polygonal axis segment 29 adopts, but is not limited to, a square axis, a regular hexagonal axis, or a regular octagonal axis.

[0023] See Figure 4 As a preferred structural form, the cross-section of the regular polygonal axis is a square, and the cross-section of the inner contour of the sliding sleeve 23 is also a square. In this case, the sliding sleeve 23 can only slide along the regular polygon, and the two cannot rotate relative to each other.

[0024] Specifically, the sliding sleeve 23 includes four side plates that are perpendicular to each other in pairs, one of which has the aforementioned opening, the width of which is (i.e., Figure 4The vertical dimension (in the figure) is greater than the outer diameter of the second circular shaft, thus allowing the sliding sleeve 23 to be removed from the second circular shaft.

[0025] In this embodiment, the length of the first circular shaft segment 21 is less than the length of the second circular shaft segment 28, and the length difference between the first circular shaft segment 21 and the second circular shaft segment 28 is greater than the length of a single sliding sleeve 23 along its own axial direction.

[0026] In this configuration, the second circular shaft segment 28 is relatively long, which allows the second circular shaft segment 28 to be installed through the aforementioned housing 3 while also providing installation space for the retaining sleeve 27 on the second circular shaft.

[0027] In this embodiment, the stirring blade 24 also includes a blade portion, which is connected to the sliding sleeve 23, and the two are integrally formed.

[0028] In this embodiment, the notch 251 is a rectangular notch 251.

[0029] In other embodiments, the cross-sectional profile of the notch 251 can be other shapes, as long as the sliding sleeve 23 can be radially disengaged from the circular shaft at the notch 251.

[0030] In this embodiment, the retaining sleeve 27 is divided into a first half sleeve 271 and a second half sleeve 272 along the circumference. The first half sleeve 271 and the second half sleeve 272 are respectively provided with corresponding screw holes 274. When the first half sleeve 271 and the second half sleeve 272 are aligned to form a circular sleeve, the corresponding screw holes 274 are aligned. The bolt 26 is inserted into the two aligned screw holes 274 and fixed by the nut.

[0031] To prevent the bolt 26 at the retaining sleeve 27 from being blocked, a rubber sleeve can be fitted over the entire retaining sleeve 27 to cover the bolt 26.

[0032] In order to achieve better positioning of the retaining sleeve 27 along the second circular axis, a reduced diameter section 281 is provided on the second circular axis section 28, and the retaining sleeve 27 is fitted on the outside of the reduced diameter section 281.

[0033] Working principle: When a stirring blade 24 is damaged and needs to be replaced, first remove the retaining sleeve 27, then slide the sliding sleeve 23 sequentially to the position of the second circular shaft. Then, apply an external force to the sliding sleeve 23 radially along the second circular shaft, causing the second circular shaft and the sliding sleeve 23 to move relative to each other along the notch 251. The sliding sleeve 23, carrying the stirring blade 24, will then disengage sequentially from the second circular shaft. This process continues until the damaged stirring blade 24 and the sliding sleeve 23 are removed.

[0034] Then, the reverse procedure is followed: first, the sliding sleeve 23 to be installed is fitted onto the outside of the second circular shaft section through the notch 251, and then the sliding sleeve 23 is slid onto the regular polygonal shaft section 29. After all the sliding sleeves 23 are installed, the retaining sleeve 27 is reinstalled for abutment.

[0035] Example 2

[0036] This embodiment has the same structural configuration as Embodiment 1, except that it provides another connection structure for the first half-set 271 and the second half-set 272.

[0037] For details, see Figure 5 The first half-set 271 and the second half-set 272 have connecting plates 273 at both ends along the circumferential direction. The connecting plates 273 of the first half-set 271 and the second half-set 272 abut against each other and are connected by bolts 26.

[0038] In this embodiment, the connecting plate 273 is provided with screw holes 274 for inserting bolts 26. The length of the bolt 26 is less than the thickness of the two connecting plates 273. The screw holes 274 can be filled with rubber plugs to abut against both ends of the bolt 26.

[0039] In this embodiment, the baffle 27 is divided into a baffle plate part and a connecting sleeve (not shown in the figure) with different outer diameters along the radial direction. The baffle plate part is used to stop the stirring blade 24, and the connecting sleeve is used to fix the connecting plate 273.

[0040] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0041] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A concrete mixing shaft assembly, characterized in that, It includes a rotating shaft, which has a first circular shaft segment, a regular polygonal shaft segment and a second circular shaft segment arranged sequentially along the axial direction; along the axial direction, the projections of the first circular shaft segment and the second circular shaft segment are located inside the projection of the regular polygonal shaft segment. Multiple stirring blades are slidably sleeved on the regular polygonal shaft segment. Each stirring blade has a sliding sleeve sleeved outside the regular polygonal shaft segment, and adjacent sliding sleeves abut against each other along the axial direction. The regular polygonal shaft segment has a shoulder at one end near the first circular shaft segment. A retaining sleeve is detachably fixed on the second circular shaft, and the retaining sleeve is circumferentially split. The retaining sleeve and the shoulder can abut against the sliding sleeves on the regular polygonal shaft segment at both ends along the axial direction, respectively. The sliding sleeve has a notch that communicates with its own inner cavity. The width of the notch is greater than the diameter of the second circular shaft segment, so that the second circular shaft segment can enter or leave the sliding sleeve from the notch.

2. The concrete mixing shaft assembly according to claim 1, characterized in that, The regular polygonal axis segment can be, but is not limited to, a square axis, a regular hexagonal axis, or a regular octagonal axis.

3. The concrete mixing shaft assembly according to claim 1, characterized in that, The length of the first circular shaft segment is less than the length of the second circular shaft segment, and the difference in length between the first and second circular shaft segments is greater than the length of a single sliding sleeve along its own axial direction.

4. The concrete mixing shaft assembly according to claim 1, characterized in that, The stirring blade also includes a blade portion, which is connected to the sliding sleeve, and the two are integrally formed.

5. The concrete mixing shaft assembly according to claim 1, characterized in that, The notch is a rectangular notch.

6. The concrete mixing shaft assembly according to claim 1, characterized in that, The retaining sleeve is divided into a first half and a second half along the circumference. The first half and the second half have connecting plates at both ends along the circumference. The connecting plates of the first half and the second half abut against each other and are connected by bolts.

7. The concrete mixing shaft assembly according to claim 6, characterized in that, The connecting plate is provided with screw holes for inserting bolts. The length of the bolt is less than the thickness of the two connecting plates. The screw holes can be filled with rubber plugs to abut against both ends of the bolt.

8. The concrete mixing shaft assembly according to claim 7, characterized in that, The baffle is divided into a baffle plate and a connecting sleeve with different outer diameters along the radial direction. The baffle plate is used to stop the stirring blades, and the connecting sleeve is used to fix the connecting plate.

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