Boom of concrete pump truck and concrete pump truck

Abstract

The present invention discloses a pump truck boom and a pump truck, which relate to the field of engineering machinery and are used to make the structure of the pump truck boom more compact and reasonable. The pump truck boom includes a first boom, a second boom and a worm gear drive mechanism. The second boom is rotatably connected to the first boom. The worm gear drive mechanism includes a worm wheel and a worm that mesh with each other, and the worm wheel includes an inner ring and an outer ring that are rotatably connected; the inner ring is fixedly connected to the first boom, and the outer ring is fixedly connected to the second boom. The pump truck boom provided by the above technical solution adopts a worm gear drive mechanism to drive the first boom and the second boom to rotate relative to each other. The worm gear drive mechanism has a reverse self-locking characteristic and can achieve mechanical self-locking, so that the first boom can be safely and reliably stopped at any position relative to the second boom. In addition, the worm gear drive mechanism has a large transmission ratio, a compact structure, and low weight; the meshing tooth surfaces of the two wheels are in line contact, and the load-bearing capacity is large.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a pump truck boom and a pump truck. Background Art

[0002] A concrete boom pump truck is a type of aerial work equipment with a multi-section boom, typically five, six, or seven sections. In related technologies, these trucks use hydraulic cylinders to drive each section of the boom. Specifically, the hydraulic cylinders drive the boom through components such as a connecting rod mechanism, pins, bushings, a pin lubrication and filling device, and a hydraulic balancing valve.

[0003] The inventors discovered that the boom assembly in the prior art uses a hydraulic cylinder drive, which results in complexity, weight, and high cost, leading to high maintenance costs. To address the structural complexity associated with hydraulic cylinder drive, the prior art also utilizes a hydraulic rotary drive mechanism to achieve boom rotary drive, but this structure is also very complex. Summary of the Invention

[0004] The present invention provides a pump truck arm support and a pump truck, so as to make the structure of the pump truck arm support more compact and reasonable.

[0005] An embodiment of the present invention provides a pump truck boom, comprising:

[0006] First boom;

[0007] a second arm support rotatably connected to the first arm support; and

[0008] The worm gear drive mechanism includes a worm gear and a worm gear that mesh with each other, wherein the worm gear includes an inner ring and an outer ring that are rotatably connected; the inner ring of the worm gear is fixedly connected to the first arm, and the outer ring of the worm gear is fixedly connected to the second arm.

[0009] In some embodiments, the outer ring of the worm gear is provided with a first fluid channel and a first external flow channel, and the inner ring of the worm gear is provided with a second fluid channel and a second external flow channel; the first fluid channel and the second fluid channel are dynamically sealed to form an annular fluid channel; the first external flow channel is fluidically connected to the first fluid channel, and the second external flow channel is fluidically connected to the second fluid channel.

[0010] In some embodiments, the annular fluid channel is configured to allow gas to pass through; the pump truck boom further comprises:

[0011] The gas-using equipment is in fluid communication with the second external flow channel.

[0012] In some embodiments, the annular fluid channel is constructed to pass liquid; the outer ring of the worm gear is provided with a third fluid channel and a third external flow channel, and the inner ring of the worm gear is provided with a fourth fluid channel and a fourth external flow channel; the third fluid channel and the fourth fluid channel are dynamically sealed; the third external flow channel is fluidically connected to the third fluid channel, and the fourth external flow channel is fluidically connected to the fourth fluid channel.

[0013] In some embodiments, the pump truck arm further comprises:

[0014] The hydraulic device is in fluid communication with both the second external flow channel and the fourth external flow channel; one of the second external flow channel and the fourth external flow channel is used for liquid supply, and the other is used for liquid return.

[0015] In some embodiments, the inner ring of the worm wheel is provided with an annular groove, and the outer ring of the worm wheel is provided with a mounting groove communicating with the groove; the pump truck boom further includes:

[0016] A positive wire, one end of which passes through the mounting slot; the positive wire is arranged along the second arm;

[0017] A negative wire, one end of which passes through the mounting slot; the negative wire is also arranged along the second arm;

[0018] an insulating portion, mounted in the groove;

[0019] a positive contact in an annular shape, mounted on the insulating portion and insulated from the inner ring of the worm gear; the positive contact being in conductive contact with one end of the positive wire; and

[0020] The negative contact is annular and is also mounted on the insulating portion and insulated from the inner ring of the worm gear; the negative contact is in conductive contact with one end of the negative wire; and the negative contact is arranged separately from the positive contact.

[0021] In some embodiments, one end of the positive wire is constructed to be elastic, and the positive contact abuts against one end of the positive wire and maintains conductive contact; and / or, one end of the negative wire is constructed to be elastic, and the negative contact abuts against one end of the negative wire and maintains conductive contact.

[0022] In some embodiments, when the inner ring and the outer ring of the worm gear rotate relative to each other, the positive wire maintains conductive contact with the positive contact, and the negative wire maintains conductive contact with the negative contact.

[0023] In some embodiments, the pump truck boom further includes:

[0024] a first connecting wire, mounted on the inner ring of the worm gear and fixed to and electrically connected to the positive contact, and arranged along the first arm;

[0025] a second connecting wire, mounted on the inner ring of the worm gear and fixed to and electrically connected to the negative contact, and arranged along the first arm; and

[0026] An electrical device is electrically connected to the first connecting line and the second connecting line; the electrical device is fixed to an end of the first arm away from the second arm.

[0027] In some embodiments, the pump truck boom further includes:

[0028] The first detecting element is installed in the groove, and the first detecting element is configured to detect the relative position of the inner ring and the outer ring of the worm gear.

[0029] In some embodiments, the pump truck boom further includes:

[0030] The second detecting element is mounted on the worm, and is configured to detect the relative position of the inner ring and the outer ring of the worm wheel.

[0031] An embodiment of the present invention further provides a pump truck, comprising:

[0032] a delivery pipe configured to deliver concrete; and

[0033] The pump truck arm frame provided by any technical solution of the present invention; the delivery pipe is rotatably installed at the rotation center of the worm gear of the pump truck arm frame.

[0034] The pump truck boom provided by the above technical solution uses a worm gear drive mechanism to drive the relative rotation of the first boom and the second boom. The worm gear drive mechanism has a reverse self-locking feature, which can achieve mechanical self-locking, so that the first boom can be safely and reliably stopped at any position relative to the second boom. In addition, the worm gear drive mechanism has a large transmission ratio, a compact structure, and a low weight; the meshing tooth surfaces of the two wheels are in line contact, and the load-bearing capacity is large. The worm gear drive mechanism is equivalent to a spiral transmission and is a multi-tooth meshing transmission, so the transmission is smooth and the noise is very low. The worm gear drive mechanism includes a small number of components and is very convenient for disassembly and assembly, which greatly simplifies the assembly device of the pump truck boom, reduces cost and weight, improves the reliability of the pump truck boom, reduces cost, and simplifies maintenance. It no longer requires cylinders and pins, reducing the customer's subsequent use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 This is a schematic diagram of the structure of the boom portion of a pump truck provided in an embodiment of the present invention.

[0037] Figure 2 A schematic structural diagram of the worm gear drive mechanism of a pump truck boom provided by an embodiment of the present invention.

[0038] Figure 3 A schematic cross-sectional view of a worm gear of a worm gear drive mechanism of a pump truck boom provided by an embodiment of the present invention.

[0039] Figure 4 for Figure 3 A is a partial enlarged schematic diagram of .

[0040] Figure 5 for Figure 3 B is a partial enlarged schematic diagram.

[0041] Figure 6 A schematic diagram of the connection between the pump truck boom and the delivery pipe of the pump truck provided in an embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. First boom; 2. Second boom; 3. Worm gear drive mechanism; 4. Pneumatic equipment; 5. Hydraulic equipment; 6. Positive wire; 7. Negative wire; 8. Insulation; 9. Positive contact; 10. Negative contact; 11. First connecting wire; 12. Second connecting wire; 13. Electrical equipment; 14. Delivery pipe; 15. Power unit.

[0044] 31. Worm gear; 32. Worm; 33. Rotating element; 34. Dynamic seal;

[0045] 311, inner circle; 312, outer circle;

[0046] 3121, first fluid channel; 3122, first external flow channel; 3123, mounting groove;

[0047] 3111. Second fluid channel; 3112. Second external flow channel; 3113. Groove. DETAILED DESCRIPTION

[0048] The following combination Figures 1 to 6 The technical solution provided by the present invention is described in more detail.

[0049] See also Figure 1, an embodiment of the present invention provides a pump truck. A pump truck is an aerial work equipment that can transport materials such as concrete within a certain range. The pump truck includes a delivery pipe 14 and a pump truck boom provided by any technical solution of the present invention. The delivery pipe 14 is constructed to transport concrete. The delivery pipe 14 is supported and carried by the pump truck boom, so that the delivery pipe 14 can be firmly installed and reliably transport materials, and the concrete is transported to a designated position along the delivery pipe 14. The delivery pipe 14 is rotatably mounted at the center of rotation of the worm gear 31 of the pump truck boom. The pump truck boom includes a multi-section arm, and two adjacent sections of the arm are rotatably connected. The amplitude variation of the pump truck boom is achieved by driving at least one of the adjacent connecting arms to rotate relative to the other section.

[0050] The first boom 1, second boom 2, worm gear drive mechanism 3, and delivery pipe 14 are concentrically mounted. The relative rotation of the first boom 1 and second boom 2 revolves around the rotation center of the worm gear of the worm gear drive mechanism 3. The rotation center of the delivery pipe 14 also coincides with the rotation center of the worm gear of the worm gear drive mechanism 3, allowing the delivery pipe 14 attached to adjacent first booms 1 and second booms 2 to rotate freely. The coincidence of the relative rotation centers of the adjacent first booms 1 and second booms 2, the rotation center of the worm gear of the worm gear drive mechanism 3, and the rotation center of the delivery pipe 14 results in a more rational structure for the entire pump truck, prevents interference between components, and achieves more stable movement.

[0051] Any two boom sections of the pump truck boom are rotatably connected, and a drive mechanism is installed at the connection between any two boom sections to enable the movement of each arm, ultimately achieving multi-dimensional flexible movement of the multi-section boom. Any two boom sections can be driven by the same drive method, that is, both are driven by the worm gear drive mechanism 3. For the sake of clarity and simplicity in describing the technical solutions of the embodiments of the present invention, the following detailed description uses two boom sections as an example.

[0052] See also Figure 1 An embodiment of the present invention provides a pump truck boom, comprising a first boom 1, a second boom 2 and a worm gear drive mechanism 3. The second boom 2 is rotatably connected to the first boom 1. With the pump truck boom in a partially unfolded state as a reference, the second boom 2 is located at the bottom of the first boom 1, and the second boom 2 supports the first boom 1. The worm gear drive mechanism 3 is arranged at the rotatable connection between the first boom 1 and the second boom 2. The worm gear drive mechanism 3 includes a worm wheel 31 and a worm 32 that are meshed with each other, and the worm wheel 31 includes an inner ring 311 and an outer ring 312 that are rotatably connected; the inner ring 311 of the worm wheel 31 is fixedly connected to the first boom 1, and the outer ring 312 of the worm wheel is fixedly connected to the second boom 2.

[0053] It's understood that, with the exception of the boom at the bottom and the end boom at the top, each intermediate arm requires a drive mechanism at both ends. The bottom end of each intermediate arm is fixedly connected to the inner ring 311 of the worm gear 31, while the top end is fixedly connected to the outer ring 312 of another worm gear 31. In other words, each intermediate arm serves as both the first boom 1 of two adjacent booms and the second boom 2 of another two adjacent booms.

[0054] See also Figure 1 and Figure 2 The power device 15 is connected to the worm 32, driving the worm 32 to rotate about its own central axis. The worm wheel 31 rotates about its own central axis. The worm wheel 31 has no linear displacement relative to the worm 32. The power device 15 can be a hydraulic motor, an electric motor, etc.

[0055] Taking the example of a power unit 15 employing a hydraulic motor, when the hydraulic system drives the hydraulic motor to rotate, the worm gear drive mechanism 3 operates, causing the inner ring 311 and outer ring 312 of the worm wheel 31 to move relative to each other. Driven by the inner ring 311 and outer ring 312 of the worm wheel 31, the first boom 1 and the second boom 2 also move relative to each other. The hydraulic system can change the direction of rotation of the hydraulic motor, so the direction of relative movement of two adjacent first booms 1 and second booms 2 can also be changed. When the hydraulic system stops operating, the self-locking characteristics of the worm gear drive mechanism 3 stop the relative movement of the first boom 1 and the second boom 2. Therefore, the first boom 1 and the second boom 2 can stop at any position, and the self-locking mechanism is mechanically locked, which is safe and reliable.

[0056] See also Figure 2 The worm gear 31 includes a rotatably connected inner ring 311 and outer ring 312. A rotating element 33, such as a ball, cylindrical roller, or tapered roller, is sandwiched between the inner and outer rings 311, 312. The inner and outer rings 311, 312 are relatively rotatable. The outer ring 312 meshes with the worm 32 and is driven to rotate by the worm 32. The inner ring 311 is fixedly connected to the first arm 1, specifically by bolts or other means. The outer ring 312 is fixedly connected to the second arm 2, specifically by bolts or other means.

[0057] The first boom 1 and the second boom 2 utilize a worm gear drive mechanism 3, which offers significant advantages. First, the worm gear drive mechanism 3 features a reverse self-locking feature, enabling mechanical self-locking of the boom, allowing the boom to safely and reliably stop at any position, making the concrete boom pump truck safer and more reliable. Second, the worm gear drive mechanism 3 offers a large transmission ratio, a compact structure, and low weight. The meshing tooth surfaces of the two wheels are in line contact, providing a high load-bearing capacity. Furthermore, the worm gear drive mechanism 3 is equivalent to a helical drive, a multi-tooth meshing transmission, resulting in smooth transmission and low noise. Finally, the worm gear drive mechanism 3 comprises a small number of components, making assembly and disassembly easy. A pin is no longer required between the first boom 1 and the second boom 2; instead, the connection is driven by the worm gear drive mechanism 3. Users no longer need to relubricate the pin during subsequent use, simplifying maintenance and reducing costs.

[0058] After further research, the inventors found that after being driven by the worm gear drive mechanism 3, the rotation angle of the worm wheel 31 is very large, which can reach several turns, and its rotation angle is N times 360°, where N is greater than 0. In addition to the boom, the pump truck boom is also equipped with some gas equipment 4, electrical equipment 13 or hydraulic equipment 5. When the angle of rotation of the worm wheel 31 is too large, the wires, air pipes, and liquid pipes of these equipment may have a larger rotation angle, resulting in adverse phenomena such as entanglement and twisting of the wires and pipes. How to make these devices work better is another difficult problem that needs to be solved. To this end, the inventors further proposed the following technical solutions.

[0059] See also Figures 3 to 6 In some embodiments, the outer ring 312 of the worm gear 31 is provided with a first fluid channel 3121 and a first external flow channel 3122. The inner ring 311 of the worm gear 31 is provided with a second fluid channel 3111 and a second external flow channel 3112 (not shown). The first fluid channel 3121 and the second fluid channel 3111 are connected in a dynamic sealing manner to form an annular fluid channel; the location of the dynamic seal 34 is shown in FIG. Figure 4 、 Figure 5 The first external flow channel 3122 is in fluid communication with the first fluid channel 3121, and the second external flow channel 3112 is in fluid communication with the second fluid channel 3111. The dynamic sealing connection prevents fluid leakage.

[0060] The fluid first enters the first external flow channel 3122 and then the first fluid channel 3121. Because the first and second fluid channels 3121 and 3111 are dynamically sealed to form an annular fluid channel, the fluid flows from the first fluid channel 3121 into the portion of the annular fluid channel where the second fluid channel 3111 is located, then into the second external flow channel 3112. The fluid then flows along the pipeline connected to the second external flow channel 3112 to the other end of the first boom 1 and into the first external flow channel 3122 located at the other end of the first boom 1, circulating sequentially until it reaches the end arm and is then connected to the flow-consuming equipment installed on the end arm.

[0061] The flow-using device refers to a device that needs to use the fluid inside the first external flow channel 3122 , the first fluid channel 3121 , the second fluid channel 3111 , and the second external flow channel 3112 .

[0062] Depending on the type of flow-consuming equipment, it can be further divided into gas-consuming equipment 4 and liquid-consuming equipment. For gas-consuming equipment 4, the pump truck boom only needs to be equipped with the aforementioned first external flow channel 3122, first fluid channel 3121, second fluid channel 3111, and second external flow channel 3112 to achieve gas transportation. A separate return flow path is not required, as the gas exhausted from the gas-consuming equipment 4 can be directly discharged into the atmosphere.

[0063] In this case, the annular fluid channel is constructed to allow gas to pass through. The pump truck boom also includes a gas-using device 4, which is in fluid communication with the second external flow channel 3112. The gas-using device 4 is, for example, a pneumatic valve. Some pump truck models install a pneumatic valve at the terminal hose to lock the terminal hose to prevent concrete from spilling when the boom is transferred. The direction of the airflow is: high-pressure gas passes through the first external flow channel 3122 into the annular fluid channel formed by the first fluid channel 3121 and the second fluid channel 3111, and then is output from the second external flow channel 3112 to the high-pressure gas inlet of the gas-using device 4. The low-pressure passage of the gas-using device 4 can be directly connected to the outside atmosphere, so that some airway equipment can be omitted, making the equipment structure more compact. The above technical solution realizes the transmission of high-pressure airflow across the worm gear drive mechanism 3, and no matter how many turns the relative rotation angle of the inner ring 311 and the outer ring 312 of the worm gear 31 is, it does not affect the normal transmission of the airflow, nor does it cause the airflow transmission pipe 14 to become knotted, entangled, or broken.

[0064] Of course, depending on the requirements of the equipment, the above-mentioned annular fluid channel can also be used as a liquid flow channel. In this case, another set of liquid circuits needs to be set up to achieve liquid return. Specifically, the annular fluid channel is constructed to pass liquid. The outer ring 312 of the worm gear 31 is provided with a third fluid channel (not shown in the figure) and a third external flow channel (not shown in the figure), and the inner ring 311 of the worm gear 31 is provided with a fourth fluid channel (not shown in the figure) and a fourth external flow channel (not shown in the figure). The third fluid channel and the fourth fluid channel are dynamically sealed. The third external flow channel is in fluid communication with the third fluid channel, and the fourth external flow channel is in fluid communication with the fourth fluid channel.

[0065] In some embodiments, the pump truck boom further includes a hydraulic device 5, which is fluidically connected to the second external flow channel 3112 and the fourth external flow channel; one of the second external flow channel 3112 and the fourth external flow channel is used for liquid supply, and the other is used for liquid return.

[0066] Taking the second external flow channel 3112 as the liquid supply channel and the fourth external flow channel as the liquid return channel, the liquid flows as follows: the oil pump pumps high-pressure liquid into the first external flow channel 3122, then enters the annular fluid channel formed by the first fluid channel 3121 and the second fluid channel 3111, and then outputs it from the second external flow channel 3112 to the high-pressure liquid inlet of the liquid-using device. The low-pressure liquid outlet of the liquid-using device is connected to the fourth external flow channel fluid and then flows into the fourth fluid channel. Because the fourth fluid channel and the third fluid channel are dynamically sealed, the liquid then enters the third fluid channel, the third external flow channel, and then enters the pipeline connected to the third external flow channel, and finally returns to the oil tank.

[0067] The first and third fluid channels 3121 and 3122 of the outer ring 312 of the worm gear 31 are independent and prevent cross-flow. Separation of the first and third fluid channels 3121 and 3121 can be achieved by setting different annular radii. The second and fourth fluid channels 3111 and 3111 of the inner ring 311 of the worm gear 31 are also independent and prevent cross-flow. Separation of the second and fourth fluid channels 3111 and 3111 can be achieved by setting them at different distances from the rotor 33.

[0068] See also Figures 3 to 6 , the following describes how to set up the wires of the electrical equipment 13.

[0069] See also Figures 3 to 6 In some embodiments, the inner ring 311 of the worm gear 31 is provided with an annular groove 3113, and the outer ring 312 of the worm gear 31 is provided with a mounting groove 3123 connected to the groove 3113. The pump truck arm frame also includes a positive wire 6, a negative wire 7, an insulating portion 8, a positive contact 9, and a negative contact 10. Figure 5One end of the positive wire 6 passes through the mounting groove 3123; the positive wire 6 is arranged along the second arm 2. One end of the negative wire 7 passes through the mounting groove 3123; the negative wire 7 is also arranged along the second arm 2. The insulating portion 8 is installed in the groove 3113. The insulating portion 8 is made of, for example, an annular rubber. The positive contact 9 is annular and mounted on the insulating portion 8. The positive contact 9 is insulated from the inner ring 311 and outer ring 312 of the worm gear 31. The positive contact 9 is in conductive contact with one end of the positive wire 6. The negative contact 10 is annular and also mounted on the insulating portion 8. The negative contact 10 is insulated from the inner ring 311 and outer ring 312 of the worm gear 31. The negative contact 10 is in conductive contact with one end of the negative wire 7. The negative contact 10 is arranged separately from the positive contact 9.

[0070] External current passes through the positive wire 6 and the negative wire 7 to reach the positive contact 9 and the negative contact 10. The electric device 13 is, for example, a speaker, etc., which is used to transmit working information.

[0071] See also Figures 3 to 5 The groove 3113 of the inner ring 311 of the worm gear 31, the fluid channels, and the external flow channels are located on both sides of the rotating body 33 between the inner ring 311 and the outer ring 312 of the worm gear 31. This allows high-pressure fluid and electrical signals to be transmitted to the next boom section through the worm gear drive mechanism 3.

[0072] See also Figure 5 In some embodiments, one end of the positive wire 6 is elastically configured, and the positive contact 9 abuts against and maintains conductive contact with the end of the positive wire 6. And / or, one end of the negative wire 7 is elastically configured, and the negative contact 10 abuts against and maintains conductive contact with the end of the negative wire 7.

[0073] When the inner ring 311 and outer ring 312 of the worm gear 31 rotate relative to each other, the positive wire 6 maintains conductive contact with the positive contact 9, and the negative wire 7 maintains conductive contact with the negative contact 10. Regardless of the relative rotation angle of the inner ring 311 and outer ring 312 of the worm gear 31, the positive wire 6 and negative wire 7 maintain conductive contact with their corresponding contacts, ensuring normal power transmission.

[0074] See also Figure 4 In some embodiments, the pump truck boom further includes a first connecting line 11, a second connecting line 12, and an electrical device 13. The first connecting line 11 is mounted on the inner ring 311 of the worm gear 31 and is fixed and electrically connected to the positive contact 9, and is arranged along the first boom 1. The second connecting line 12 is mounted on the inner ring 311 of the worm gear 31 and is fixed and electrically connected to the negative contact 10, and is arranged along the first boom 1. The electrical device 13 is electrically connected to the first connecting line 11 and the second connecting line 12; the electrical device 13 is fixed to the end of the first boom 1 away from the second boom 2.

[0075] In some embodiments, the pump truck boom further includes a first detection element mounted within the groove 3113 and configured to detect the relative position of the inner ring 311 and outer ring 312 of the worm gear 31. The first detection element, for example, is an encoder. The first detection element detects the relative position of the inner ring 311 and outer ring 312 of the worm gear 31, and calculations can be used to determine the relative speed and relative motion angle, enabling precise control of the boom's rotational motion.

[0076] In some embodiments, the pump truck boom further includes a second detection element 16 mounted on the worm 32. The second detection element 16 is configured to detect the relative position of the inner ring 311 and the outer ring 312 of the worm gear 31. The second detection element 16 can be, for example, an encoder. The second detection element 16 enables precise control of the relative rotation angle and number of rotations of the first boom 1 and the second boom 2, thereby precisely controlling the relative position and rotational motion of the first boom 1 and the second boom 2.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to 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, rather than indicating or implying 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 limiting the protection content of the present invention.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pump truck boom, characterized in that: include: First boom (1); A second arm (2) rotatably connected to the first arm (1); as well as A worm gear drive mechanism (3) comprises a worm gear (31) and a worm gear (32) meshing with each other, wherein the worm gear (31) comprises an inner ring (311) and an outer ring (312) rotatably connected; the inner ring (311) of the worm gear (31) is fixedly connected to the first arm (1), and the outer ring (312) of the worm gear is fixedly connected to the second arm (2); The outer ring (312) of the worm wheel (31) is provided with a first fluid channel (3121) and a first external flow channel (3122), and the inner ring (311) of the worm wheel (31) is provided with a second fluid channel (3111) and a second external flow channel (3112); the first fluid channel (3121) and the second fluid channel (3111) are dynamically sealed to form an annular fluid channel; the first external flow channel (3122) is in fluid communication with the first fluid channel (3121), and the second external flow channel (3112) is in fluid communication with the second fluid channel (3111).

2. The pump truck boom according to claim 1, characterized in that: The annular fluid channel is configured to allow gas to pass through; the pump truck arm further comprises: The gas-using device (4) is in fluid communication with the second external flow channel (3112).

3. The pump truck boom according to claim 1, characterized in that: The annular fluid channel is configured to allow liquid to pass through; the outer ring (312) of the worm wheel (31) is provided with a third fluid channel and a third external flow channel, and the inner ring (311) of the worm wheel (31) is provided with a fourth fluid channel and a fourth external flow channel; the third fluid channel and the fourth fluid channel are dynamically sealed; the third external flow channel is in fluid communication with the third fluid channel, and the fourth external flow channel is in fluid communication with the fourth fluid channel.

4. The pump truck boom according to claim 3, characterized in that: The pump truck arm also includes: The hydraulic device (5) is in fluid communication with the second external flow channel (3112) and the fourth external flow channel; one of the second external flow channel (3112) and the fourth external flow channel is used as a liquid supply, and the other is used as a liquid return.

5. The pump truck boom according to claim 1, characterized in that: The inner ring (311) of the worm wheel (31) is provided with an annular groove (3113), and the outer ring (312) of the worm wheel (31) is provided with a mounting groove (3123) communicating with the groove (3113); the pump truck arm frame further includes: A positive wire (6), one end of which passes through the mounting slot (3123); the positive wire (6) is arranged along the second arm (2); A negative wire (7), one end of which passes through the mounting slot (3123); the negative wire (7) is also arranged along the second arm (2); An insulating portion (8) is installed in the groove (3113); A positive contact (9) is annular and mounted on the insulating portion (8) and insulated from the inner ring (311) of the worm gear (31); the positive contact (9) is in conductive contact with one end of the positive wire (6); and The negative contact (10) is annular and is also mounted on the insulating portion (8) and is insulated from the inner ring (311) of the worm gear (31); the negative contact (10) is in conductive contact with one end of the negative wire (7); and the negative contact (10) is arranged separately from the positive contact (9).

6. The pump truck boom according to claim 5, characterized in that: One end of the positive wire (6) is constructed to be elastic, and the positive contact (9) abuts against one end of the positive wire (6) and maintains conductive contact; and / or, one end of the negative wire (7) is constructed to be elastic, and the negative contact (10) abuts against one end of the negative wire (7) and maintains conductive contact.

7. The pump truck boom according to claim 5, characterized in that: When the inner ring (311) and the outer ring (312) of the worm wheel (31) rotate relative to each other, the positive wire (6) maintains conductive contact with the positive contact (9), and the negative wire (7) maintains conductive contact with the negative contact (10).

8. The pump truck boom according to claim 5, characterized in that: Also includes: A first connecting wire (11) is mounted on the inner ring (311) of the worm wheel (31) and is fixed and electrically connected to the positive contact (9), and is arranged along the first arm (1); a second connecting wire (12), mounted on the inner ring (311) of the worm wheel (31), fixed to and electrically connected to the negative contact (10), and arranged along the first arm (1); as well as An electrical device (13) is electrically connected to the first connecting line (11) and the second connecting line (12); the electrical device (13) is fixed to an end of the first arm (1) away from the second arm (2).

9. The pump truck boom according to claim 5, characterized in that: Also includes: A first detection element is installed in the groove (3113), and the first detection element is configured to detect the relative position of the inner ring (311) and the outer ring (312) of the worm wheel (31).

10. The pump truck boom according to claim 5, characterized in that: Also includes: A second detection element (16) is mounted on the worm (32), and the second detection element (16) is configured to detect the relative position of the inner ring (311) and the outer ring (312) of the worm wheel (31).

11. A pump truck, characterized in that: include: a delivery pipe (14) configured to deliver concrete; as well as The pump truck boom according to any one of claims 1 to 10; the delivery pipe (14) is rotatably mounted at the rotation center of the worm gear (31) of the pump truck boom.

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