TBM Concrete Mixing Device

Abstract

The present invention discloses a TBM concrete mixing device, comprising: a frame, a mixing drum arranged on the frame, two mixing shafts arranged longitudinally and parallel to each other in the mixing drum, and a mixing drive device for providing power for the rotation of the mixing shafts. A vibrating shaft cylinder is sleeved on the mixing shafts, and mixing arms are arranged on the vibrating shaft cylinder, and mixing blades are arranged at the ends of the mixing arms. Wherein, the mixing shafts and the vibrating shaft cylinder are connected through an excitation assembly, so that the vibrating shaft cylinder rotates synchronously with the mixing shafts, and at the same time, the vibrating shaft cylinder also vibrates radially along the mixing shafts. The present invention does not need to be provided with a vibration drive device, which saves costs. At the same time, the excitation device no longer needs to penetrate through the side plate of the mixing barrel, avoiding the problem of increasing the design difficulty of the shaft seal structure.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete mixing, and more specifically, to a TBM concrete mixing device. Background Art

[0002] TBM refers to a full-face tunnel boring machine. It can support tunneling, support, slag removal and other processes and carry out continuous construction in tunnel construction. It is currently the most advanced large-scale tunnel construction equipment in the world. TBM concrete is concrete suitable for tunnel construction with TBM equipment. Since TBM equipment sprays concrete to the sprayed surface by high-speed spraying, the concrete solidifies and hardens in a very short time, so the quality requirements of concrete are very high. In the preparation process of TBM concrete, the mixing and stirring of raw materials is an important link, and the uniformity of mixing affects various indicators of concrete. At present, the equipment used for TBM concrete mixing is generally a twin-shaft mixer, but the twin-shaft mixer has the problem that the mixture is difficult to achieve micro-uniformity, and when the mixing device is working, the speed near the center of the circular mixing drum is low, and the speed at the drum wall is high, which makes the uniformity of different circular rings in the mixing drum different, which makes the center of the mixing drum become a low-efficiency mixing area, delaying the working time of the whole machine and leaving quality risks. On the other hand, the mixture in the low-efficiency area has poor fluidity and is easy to adhere to the mixing shaft, resulting in a shaft-sticking phenomenon. Although a vibrating mixer has been disclosed in the prior art, a vibration driving and exciting device needs to be provided at the other end of the mixing shaft in the vibrating mixer, which increases the cost and the difficulty of designing the shaft sealing structure. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] Another object of the present invention is to provide a TBM concrete mixing device, which does not require a vibration drive device, thereby saving costs. At the same time, the vibration device no longer needs to pass through the side plate of the mixing barrel, thereby avoiding the problem of increasing the difficulty of shaft sealing structure design.

[0005] In order to achieve these purposes and other advantages according to the present invention, a TBM concrete mixing device is provided, comprising: a frame, a mixing drum arranged on the frame, two mixing shafts arranged in parallel in the mixing drum along the longitudinal direction, and a mixing transmission device providing power for the rotation of the mixing shafts, wherein a vibrating shaft cylinder is sleeved on the mixing shaft, a mixing arm is arranged on the vibrating shaft cylinder, and a mixing blade is arranged at the end of the mixing arm;

[0006] The stirring shaft and the vibration shaft cylinder are connected via a vibration excitation component so that the vibration shaft cylinder rotates synchronously with the stirring shaft, and the vibration shaft cylinder also vibrates radially along the stirring shaft.

[0007] Preferably, the excitation component comprises:

[0008] At least two pairs of cylindrical pins are sequentially arranged on the stirring shaft along the axial direction of the stirring shaft, each pair of cylindrical pins are symmetrically arranged on both sides of the stirring shaft along the axis of the stirring shaft, and radial lines of the stirring shaft where at least two pairs of cylindrical pins are located are parallel to each other;

[0009] The inner wall of the vibration shaft cylinder is provided with a guide cylinder corresponding to each cylindrical pin, and each cylindrical pin is inserted into its corresponding guide cylinder. An exciting spring is also provided in the guide cylinder, and one end of the exciting spring abuts against the inner wall of the vibration shaft cylinder, and the other end abuts against the end of the cylindrical pin.

[0010] Preferably, the excitation component comprises:

[0011] At least two pairs of guide cylinders are sequentially arranged on the stirring shaft along the axial direction of the stirring shaft, each pair of guide cylinders are symmetrically arranged on both sides of the stirring shaft along the axis of the stirring shaft, and radial lines of the stirring shaft where the at least two pairs of guide cylinders are located are parallel to each other;

[0012] The inner wall of the vibration shaft cylinder is provided with cylindrical pins corresponding to each guide cylinder, and each cylindrical pin is inserted into its corresponding guide cylinder. An exciting spring is also provided in the guide cylinder, and one end of the exciting spring abuts against the stirring shaft, and the other end abuts against the end of the cylindrical pin.

[0013] Preferably, the vibration shaft cylinder is formed by splicing two semicircular grooves with the grooves facing each other.

[0014] Preferably, a liquid-blocking structure is provided at each of the two ends of the vibration shaft cylinder, and the liquid-blocking structure includes: an annular end plate connected to the end of the vibration shaft cylinder, the inner diameter of the annular end plate meets the requirement of the maximum radial vibration displacement of the vibration shaft cylinder relative to the stirring shaft, a first sleeve is coaxially connected to the outside of the inner hole of the annular end plate, a sliding ring plate is coaxially connected to the outer end of the first sleeve, a fixed ring plate abutting the sliding ring plate is provided on the stirring shaft, and a lubricant is attached between the sliding ring plate and the fixed ring plate so that the sliding ring plate can slide relative to the fixed ring plate, a second sleeve is connected to the edge of the fixed ring plate, and a rubber sealing ring is connected between the second sleeve and the first sleeve.

[0015] Preferably, the ring width of the rubber sealing ring sheet is larger than the distance between the second sleeve and the first sleeve when they are coaxial.

[0016] Preferably, the stirring transmission device comprises: a driving motor and a reducer arranged outside the stirring drum, the output shaft of the driving motor is connected to the input shaft of the reducer through a belt transmission mechanism, and the output shaft of the reducer is connected to the stirring shaft.

[0017] Preferably, stirring transmission devices are provided at the same side ends of the two stirring shafts, and a synchronous coupling is provided between the reducers in the two stirring transmission devices.

[0018] The present invention includes at least the following beneficial effects: by improving the existing vibration stirring device, only one driving motor is needed to realize driving rotation and vibration at the same time, and the improved exciting component is completely arranged in the mixing drum, and the vibration shaft barrel does not pass through the side plate of the mixing drum, so there is no need to improve the shaft sealing structure where the stirring shaft passes through the side plate of the mixing drum, thereby avoiding increasing the difficulty of the shaft sealing structure design. At the same time, the liquid-blocking structure arranged at both ends of the vibration shaft barrel neither hinders the vibration of the vibration shaft barrel relative to the stirring shaft in the radial direction, nor prevents concrete mortar from entering the vibration shaft barrel, thereby extending the maintenance period of the exciting component and reducing the difficulty of maintenance.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the top view of the TBM concrete mixing device according to an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of an implementation method of the excitation component according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic structural diagram of a cylindrical pin according to an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of another implementation of the excitation component according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the liquid-blocking structure described in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0026] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] See also Figure 1 As shown, this embodiment provides a TBM concrete mixing device, comprising: a frame 1, a mixing drum 2 arranged on the frame 1, two mixing shafts 3 arranged longitudinally and parallelly in the mixing drum 2, and a mixing transmission device providing power for the mixing shaft 3 to rotate, wherein a vibrating shaft cylinder 4 is sleeved on the mixing shaft 3, a mixing arm 5 is arranged on the vibrating shaft cylinder 4, and a mixing blade 6 is arranged at the end of the mixing arm 5;

[0028] The stirring shaft 3 and the vibration shaft cylinder 4 are connected via a vibration excitation component, so that the vibration shaft cylinder 4 rotates synchronously with the stirring shaft 3 , and the vibration shaft cylinder 4 also vibrates radially along the stirring shaft 3 .

[0029] Specifically, the stirring transmission device includes: a driving motor 7 and a reducer 8 arranged outside the stirring drum 2, the output shaft of the driving motor 7 is connected to the input shaft of the reducer 8 through a belt transmission mechanism 9, where the belt transmission mechanism 9 includes a driving pulley arranged on the output shaft of the driving motor 7, a driven pulley arranged on the input shaft of the reducer 8, and a transmission belt connecting the driving pulley and the driven pulley, and the output shaft of the reducer 8 is connected to the stirring shaft 3.

[0030] Specifically, stirring transmission devices are provided at the same side ends of the two stirring shafts 3 , and a synchronous coupling 10 is provided between the reducers 8 in the two stirring transmission devices, so that the two stirring shafts 3 can rotate synchronously.

[0031] For details, see Figures 2-3 As shown, the excitation component includes:

[0032] At least two pairs of cylindrical pins 11 are sequentially arranged on the stirring shaft 3 along the axial direction of the stirring shaft 3, and each pair of cylindrical pins 11 is symmetrically arranged on both sides of the stirring shaft 3 along the axis of the stirring shaft 3, and the radial lines of the stirring shaft where the at least two pairs of cylindrical pins 11 are located are parallel to each other. In one example, Figure 3 There are two pairs of cylindrical pins 11, and of course more pairs of cylindrical pins can be provided. At least two pairs of cylindrical pins are provided here, so that the two pairs of cylindrical pins can support the vibration shaft cylinder 4 on the same generatrix of the stirring shaft 3, so as to prevent the two ends of the vibration shaft cylinder 4 from hitting the stirring shaft 3 like a "seesaw";

[0033] The inner wall of the vibration shaft cylinder 4 is provided with a guide cylinder 12 corresponding to each cylindrical pin 11, and each cylindrical pin 11 is inserted into its corresponding guide cylinder 12. An exciting spring 13 is also provided in the guide cylinder 12, and one end of the exciting spring 13 abuts against the inner wall of the vibration shaft cylinder 4, and the other end abuts against the end of the cylindrical pin 11.

[0034] Specifically, the vibration shaft cylinder 4 is formed by splicing two semicircular grooves with the notches facing each other, which is convenient for setting the guide cylinder 12 on the inner wall of the vibration shaft cylinder 4 and also convenient for installing the vibration shaft cylinder 4 on the stirring shaft 3. The two semicircular grooves can be firmly bonded by colloid or connected by bolts. In order to facilitate the replacement and maintenance of the parts in the vibration shaft cylinder 4, it is better to use bolts.

[0035] When the above embodiment is in use, the driving motor 7 rotates to drive the reducer 8 to rotate, and the reducer 8 then drives the stirring shaft 3 to rotate. During the rotation of the stirring shaft 3, since the cylindrical pin 11 on the stirring shaft 3 is inserted into the guide cylinder 12, the stirring shaft 3 can also drive the vibration shaft cylinder 4 to rotate. There is a gap between the vibration shaft cylinder 4 and the stirring shaft 3, and the gravity of the vibration shaft cylinder 4 will cause the vibration shaft cylinder 4 to be eccentric. The centrifugal force that changes direction periodically during the rotation process and the elastic force generated by the compression of the exciting spring 13 force the vibration shaft cylinder 4 to vibrate in the radial direction of the stirring shaft 3. Thus, it is achieved that the stirring shaft 3 is driven to rotate and the vibration shaft cylinder 4 is driven to vibrate by a single driving motor 7. In addition, since the exciting assembly is completely arranged in the stirring drum 2, the vibration shaft cylinder 4 does not pass through the side plate of the stirring drum 2, so there is no need to improve the shaft sealing structure where the stirring shaft 3 passes through the side plate of the stirring drum 2, thereby avoiding increasing the difficulty of the shaft sealing structure design.

[0036] In another embodiment, see Figure 4 As shown, the excitation component includes:

[0037] At least two pairs of guide cylinders 12 are sequentially arranged on the stirring shaft 3 along the axial direction of the stirring shaft 3, each pair of guide cylinders 12 is symmetrically arranged on both sides of the stirring shaft 3 along the axis of the stirring shaft 3, and radial lines of the stirring shaft 3 where at least two pairs of guide cylinders 12 are located are parallel to each other;

[0038] The inner wall of the vibration shaft cylinder 4 is provided with cylindrical pins 11 corresponding to each guide cylinder 12, and each cylindrical pin 11 is inserted into its corresponding guide cylinder 12. An exciting spring 13 is also provided in the guide cylinder 12, and one end of the exciting spring 13 abuts against the stirring shaft 3, and the other end abuts against the end of the cylindrical pin 11.

[0039] In the previous embodiment, although the excitation component provides an implementation method, it is not the only implementation method. In this embodiment, by setting the guide cylinder 12 on the stirring shaft 3 and setting the cylindrical pin 11 on the vibration shaft cylinder 4, the same technical effect as the previous embodiment can also be achieved.

[0040] Since the two ends of the vibration shaft cylinder 4 are not sealed in the aforementioned embodiment, and the vibration shaft cylinder 4 is completely arranged in the mixing drum 2, concrete mortar will be poured into the vibration shaft cylinder 4 when the mixing device is used. However, there are many internal parts of the vibration shaft cylinder 4, which is inconvenient to clean in situ. Therefore, the vibration shaft cylinder 4 needs to be disassembled and cleaned once it is used, which is rather cumbersome. To address this problem, the mixing device is further improved in the following embodiment.

[0041] In another embodiment, see Figure 5 As shown, both ends of the vibration shaft cylinder 4 are provided with a liquid-blocking structure, and the liquid-blocking structure includes: an annular end plate 14 connected to the end of the vibration shaft cylinder 4, the inner diameter of the annular end plate 14 meets the requirement of the maximum radial vibration displacement of the vibration shaft cylinder 4 relative to the stirring shaft 3, the inner hole of the annular end plate 14 is coaxially connected to a first sleeve 15, the outer end of the first sleeve 15 is coaxially connected to a sliding ring plate 16, a fixed ring plate 17 abutting against the sliding ring plate 16 is provided on the stirring shaft 3, and a lubricant is attached between the sliding ring plate 16 and the fixed ring plate 17 so that the sliding ring plate 16 can slide relative to the fixed ring plate 17, the edge of the fixed ring plate 17 is connected to a second sleeve 18, and a rubber sealing ring sheet 19 is connected between the second sleeve 18 and the first sleeve 15.

[0042] In the above embodiment, since the fixed ring plate 17 is connected to the stirring shaft 3, and the sliding ring plate 16 is connected to the vibration shaft cylinder 4 through the first sleeve 15 and the annular end plate 14, and the stirring shaft 3 and the vibration shaft cylinder 4 rotate synchronously, the vibration shaft cylinder 4 only vibrates in the radial direction relative to the stirring shaft 3, so the sliding ring plate 16 also only slides in the radial direction relative to the fixed ring plate 17, and the sliding ring plate 16 always abuts against the fixed ring plate 17, that is, preventing the axial movement of the vibration shaft cylinder 4, and sealing the outer port of the first sleeve 15, and the rubber sealing ring plate 19 seals the sliding ring plate 16 in the sealing space formed by the rubber sealing ring plate 19, the fixed ring plate 17 and the second sleeve 18, which neither hinders the sliding of the sliding ring plate 16 nor prevents the concrete mortar in the mixing drum 2 from entering the vibration shaft cylinder 4.

[0043] Specifically, the ring width of the rubber sealing ring piece 19 is greater than the spacing when the second sleeve 18 and the first sleeve 15 are coaxial, so that the rubber sealing ring piece 19 has a certain margin. When the vibration shaft cylinder 4 produces the maximum vibration displacement in the radial direction relative to the stirring shaft 3, the rubber sealing ring piece 19 can still remain in a relaxed state to cope with the impact of aggregates in the concrete mortar on the rubber sealing ring piece 19, thereby avoiding the problem that the rubber sealing ring piece 19 is easily scratched by aggregates in a stretched state.

[0044] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A TBM concrete mixing device, comprising: a frame, a mixing drum arranged on the frame, two mixing shafts arranged longitudinally and parallel to each other in the mixing drum, and a mixing drive device for providing power for the rotation of the mixing shafts, characterized in that a vibrating shaft cylinder is sleeved on the mixing shafts, stirring arms are arranged on the vibrating shaft cylinder, and stirring blades are arranged at the ends of the stirring arms; wherein, the mixing shaft and the vibrating shaft cylinder are connected by an exciting component so that the vibrating shaft cylinder rotates synchronously with the mixing shaft, and at the same time the vibrating shaft cylinder also vibrates radially along the mixing shaft; Liquid blocking structures are respectively arranged at both ends of the vibrating shaft cylinder, and each liquid blocking structure includes: an annular end plate connected to the end of the vibrating shaft cylinder, the inner diameter of the annular end plate meets the requirement of the maximum vibration displacement of the vibrating shaft cylinder relative to the mixing shaft in the radial direction, a first sleeve is coaxially connected to the outside of the inner hole of the annular end plate, a sliding ring plate is coaxially connected to the outer end of the first sleeve, a fixed ring plate is arranged on the mixing shaft and abuts against the sliding ring plate, and a lubricant is attached between the sliding ring plate and the fixed ring plate so that the sliding ring plate can slide relative to the fixed ring plate, the edge of the fixed ring plate is connected with a second sleeve, and a rubber sealing ring piece is connected between the second sleeve and the first sleeve; The ring width of the rubber sealing ring piece is greater than the distance between the second sleeve and the first sleeve when they are coaxially arranged.

2. The TBM concrete mixing device according to claim 1, characterized in that the exciting component includes: at least two pairs of cylindrical pins arranged on the mixing shaft in sequence along the axial direction of the mixing shaft, each pair of cylindrical pins is symmetrically arranged on both sides of the mixing shaft along the axis of the mixing shaft, and the radial lines of the mixing shaft where at least two pairs of cylindrical pins are located are parallel to each other; Guide cylinders corresponding to each cylindrical pin are arranged on the inner wall of the vibrating shaft cylinder, each cylindrical pin is correspondingly inserted into its relative guide cylinder, and an exciting spring is further arranged in the guide cylinder, one end of the exciting spring abuts against the inner wall of the vibrating shaft cylinder, and the other end abuts against the end of the cylindrical pin.

3. The TBM concrete mixing device according to claim 1, characterized in that the exciting component includes: at least two pairs of guide cylinders arranged on the mixing shaft in sequence along the axial direction of the mixing shaft, each pair of guide cylinders is symmetrically arranged on both sides of the mixing shaft along the axis of the mixing shaft, and the radial lines of the mixing shaft where at least two pairs of guide cylinders are located are parallel to each other; Cylindrical pins corresponding to each guide cylinder are arranged on the inner wall of the vibrating shaft cylinder, each cylindrical pin is correspondingly inserted into its relative guide cylinder, and an exciting spring is further arranged in the guide cylinder, one end of the exciting spring abuts against the mixing shaft, and the other end abuts against the end of the cylindrical pin.

4. The TBM concrete mixing device according to claim 2 or 3, characterized in that the vibrating shaft cylinder is spliced by two semi-circular grooves with their groove openings facing each other.

5. The TBM concrete mixing device according to claim 1, characterized in that the mixing drive device includes: a driving motor and a speed reducer arranged outside the mixing drum, the output shaft of the driving motor is connected with the input shaft of the speed reducer through a belt transmission mechanism, and the output shaft of the speed reducer is connected with the mixing shaft.

6. The TBM concrete mixing device according to claim 5, characterized in that Agitating drive devices are provided at the same-side ends of the two agitating shafts, and a synchronous coupling is provided between the speed reducers in the two agitating drive devices.

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