Concrete pump truck

Abstract

The utility model relates to the technical field of engineering machinery, and particularly discloses a concrete pump truck which comprises a frame, an oil cylinder set, a main valve set and a pump set, the pump set is arranged at the head of the frame, the oil cylinder set is arranged at the tail of the frame, the main valve set is arranged on the frame and located between the oil cylinder set and the pump set, and the main valve set is communicated with the oil cylinder set through a hydraulic oil pipe. The main valve set communicates with the pump set through a hydraulic oil pipe. According to the concrete pump truck, the main valve group is moved from the position above the oil cylinder group to the position between the oil cylinder group and the pump group, on one hand, the space above the oil cylinder group is vacated, the situation that the main valve group easily interferes with the arm frame when the arm frame is in a folded running state is avoided, and meanwhile, the folding space of the arm frame is increased, and the arm frame with a larger section can be conveniently arranged; and on the other hand, the main valve group is positioned between the oil cylinder group and the pump group, so that a liquid path between the main valve group and the oil cylinder group is shortened, a liquid path between the main valve group and the pump group is shortened, the manufacturing cost can be reduced, the pressure loss can be reduced, and the performance index can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a concrete pump truck. Background Art

[0002] A concrete pump truck is a machine that continuously transports concrete along a pipeline by using pressure. It consists of a pump body and a delivery pipe. According to the structural form, it is divided into piston type, extrusion type, and water pressure diaphragm type. The pump body is installed on the chassis of an automobile, and then equipped with a telescopic or folding distributing boom to form a pump truck. The concrete pump truck transmits the power of the engine to the hydraulic pump group or the rear axle through a power take-off box. The hydraulic pump pushes the piston to drive the concrete pump to work, and uses the distributing boom and the delivery pipe on the pump truck to transport the concrete to a certain height and distance.

[0003] At present, the hydraulic systems of concrete pump trucks are divided into two types: open hydraulic system and closed hydraulic system. The closed hydraulic system has no main valve group, and the open hydraulic system is equipped with a main valve group. The main function of the main valve group is to realize the pumping commutation function of the concrete pump truck.

[0004] As Figure 1 shown, currently, the main valve group 3 is arranged above the oil cylinder group 2. This setting, on the one hand, occupies the space above the oil cylinder group 2. When the boom is in the retracted driving state, the oil cylinder group 2 is very likely to interfere with the boom; on the other hand, the main valve group 3 is located at the rear of the frame 1 of the concrete pump truck, and the oil cylinder group 2 is located at a position on the frame 1 close to the driving component of the concrete pump truck (i.e., the front position). Therefore, the hydraulic pipeline between the oil cylinder group 2 and the main valve group 3 is relatively long, resulting in high fluid pressure loss and cost.

[0005] Therefore, there is an urgent need for a concrete pump truck to solve the above problems. Content of the Utility Model

[0006] The purpose of the utility model is to provide a concrete pump truck to solve the problems in the related technology that the main valve group is arranged above the main oil cylinder. This setting, on the one hand, has the problem of occupying the space above the main oil cylinder; on the other hand, the main valve group is located at the rear of the concrete pump truck, and the main oil pump is located at a position on the frame close to the driving component of the concrete pump truck (i.e., the front position). Therefore, the hydraulic pipeline between the main oil pump and the main valve group is relatively long, resulting in high fluid pressure loss and cost.

[0007] The utility model provides a concrete pump truck, which includes a frame, an oil cylinder group, a main valve group, and a pump group. The pump group is arranged at the head of the frame, the oil cylinder group is arranged at the tail of the frame, the main valve group is arranged on the frame and is located between the oil cylinder group and the pump group. The main valve group is connected to the oil cylinder group through a hydraulic oil pipe, and the main valve group is connected to the pump group through a hydraulic oil pipe.

[0008] As a preferred technical solution of the concrete pump truck, the pump group includes at least two oil pumps, and at least two of the oil pumps are communicated with the main oil inlet of the main valve group.

[0009] As a preferred technical solution of the concrete pump truck, the oil cylinder group includes a first main oil cylinder and a second main oil cylinder. The first main oil cylinder is provided with at least two first oil inlets which are communicated with the rodless cavity of the first main oil cylinder. The second main oil cylinder is provided with at least two second oil inlets which are communicated with the rodless cavity of the second main oil cylinder;

[0010] The first oil outlet of the main valve group is simultaneously communicated with at least two of the first oil inlets, and the second oil outlet of the main valve group is simultaneously communicated with at least two of the second oil inlets.

[0011] As a preferred technical solution of the concrete pump truck, the oil cylinder group includes a first main oil cylinder and a second main oil cylinder. The first main oil cylinder is provided with at least two first oil inlets which are communicated with the rodless cavity of the first main oil cylinder. The second main oil cylinder is provided with at least two second oil inlets which are communicated with the rodless cavity of the second main oil cylinder;

[0012] The main valve group is provided with at least two first oil outlets and at least two second oil outlets. The first oil inlets and the first oil outlets are communicated in one-to-one correspondence, and the second oil inlets and the second oil outlets are communicated in one-to-one correspondence.

[0013] As a preferred technical solution of the concrete pump truck, the oil cylinder group includes a first main oil cylinder and a second main oil cylinder. The first main oil cylinder includes a first cylinder barrel, a first piston rod and a first cylinder base. The first piston rod is slidably arranged in the first cylinder barrel and is in sealing cooperation with one end of the first cylinder barrel. The first cylinder base is welded to the other end of the first cylinder barrel and closes the other end of the first cylinder barrel;

[0014] The second main oil cylinder includes a second cylinder barrel, a second piston rod and a second cylinder base. The second piston rod is slidably arranged in the second cylinder barrel and is in sealing cooperation with one end of the second cylinder barrel. The second cylinder base is welded to the other end of the second cylinder barrel and closes the other end of the second cylinder barrel.

[0015] As a preferred technical solution of the concrete pump truck, the first cylinder base includes a first sealing ring, a first fixed flange and a first insertion part which are fixedly connected to each other. The first sealing ring is sleeved on the outer periphery of the first insertion part. The first insertion part is inserted into the other end of the first cylinder barrel, and the inner wall of the first cylinder barrel and the first insertion part clamp the first sealing ring. The first fixed flange is welded to the other end of the first cylinder barrel;

[0016] The second cylinder base includes a second sealing ring, a second fixed flange and a second insertion part that are fixedly connected to each other. The second sealing ring is sleeved on the outer periphery of the second insertion part. The second insertion part is inserted into the other end of the second cylinder barrel, and the inner wall of the second cylinder barrel clamps the second sealing ring together with the second insertion part. The second fixed flange is welded to the other end of the second cylinder barrel.

[0017] As a preferred technical solution of the concrete pump truck, a first limiting groove is arranged on the outer peripheral wall of the first insertion part along the circumferential direction of the first insertion part, and the first sealing ring is arranged in the first limiting groove;

[0018] A second limiting groove is arranged on the outer peripheral wall of the second insertion part along the circumferential direction of the second insertion part, and the second sealing ring is arranged in the second limiting groove.

[0019] As a preferred technical solution of the concrete pump truck, the first main oil cylinder further includes a first connection flange, the first connection flange is fixedly arranged on the peripheral wall of the first cylinder barrel, the first connection flange is provided with a first communication hole, the first communication hole is communicated with the rodless cavity of the first main oil cylinder, the second main oil cylinder further includes a second connection flange, the second connection flange is fixedly arranged on the peripheral wall of the second cylinder barrel, the second connection flange is provided with a second communication hole, and the second communication hole is communicated with the rodless cavity of the second main oil cylinder;

[0020] It further includes a connecting member. The connecting member includes a connecting pipe and a first connecting part and a second connecting part arranged at both ends of the connecting pipe. The first connecting part is fixedly connected to the first connection flange, so that one end of the connecting pipe is hermetically communicated with the first communication hole, and the second connecting part is fixedly connected to the second connection flange, so that the other end of the connecting pipe is hermetically communicated with the second communication hole.

[0021] As a preferred technical solution of the concrete pump truck, the first connecting part and the second connecting part are both provided with first waist-shaped holes, the first waist-shaped holes extend along the interval direction of the first main oil cylinder and the second main oil cylinder, the first connection flange and the second connection flange are both provided with second waist-shaped holes, the second waist-shaped holes extend along the sliding direction of the first piston rod, and the first waist-shaped holes and the corresponding second waist-shaped holes are opposite;

[0022] The connecting member further includes a bolt and a nut. The bolt passes through the first waist-shaped hole and the second waist-shaped hole and is screwed with the nut.

[0023] As a preferred technical solution of the concrete pump truck, the inner diameter of one end of the connecting pipe is larger than the inner diameter of the first communication hole, and the inner diameter of the other end of the connecting pipe is larger than the inner diameter of the second communication hole.

[0024] The beneficial effects of the present utility model are:

[0025] The utility model provides a concrete pump truck, which comprises a vehicle frame, an oil cylinder group, a main valve group and a pump group. The pump group is arranged at the head of the vehicle frame, the oil cylinder group is arranged at the tail of the vehicle frame, the main valve group is arranged on the vehicle frame and between the oil cylinder group and the pump group. The main valve group is communicated with the oil cylinder group through a hydraulic oil pipe, and the main valve group is communicated with the pump group through a hydraulic oil pipe. In this concrete pump truck, the main valve group is moved from above the oil cylinder group to between the oil cylinder group and the pump group. On the one hand, this setting frees up the space above the oil cylinder group, avoiding the interference of the main valve group on the boom when the boom is in the retracted driving state, and at the same time improving the folding space of the boom, facilitating the arrangement of a boom with a larger cross-section. On the other hand, the main valve group is located between the oil cylinder group and the pump group, thereby shortening the liquid path between the main valve group and the oil cylinder group and shortening the liquid path between the main valve group and the pump group, and then reducing the manufacturing cost, reducing the pressure loss and improving the performance index. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a concrete pump truck in the prior art;

[0027] Figure 2 is a schematic structural diagram of the concrete pump truck in the embodiment of the utility model;

[0028] Figure 3 is a schematic structural diagram of the first main oil cylinder in the embodiment of the utility model;

[0029] Figure 4 is a sectional view of the first main oil cylinder in the embodiment of the utility model;

[0030] Figure 5 is a schematic structural diagram of the second main oil cylinder in the embodiment of the utility model;

[0031] Figure 6 is a sectional view of the second main oil cylinder in the embodiment of the utility model;

[0032] Figure 7 is a schematic structural diagram of the connecting piece in the embodiment of the utility model Figure 1 ;

[0033] Figure 8 is a schematic structural diagram of the connecting piece in the embodiment of the utility model Figure 2 .

[0034] In the figure:

[0035] 1. Vehicle frame;

[0036] 2. Oil cylinder group; 21. First main oil cylinder; 211. First cylinder barrel; 2111. First oil inlet; 212. First piston rod; 213. First cylinder base; 2131. First sealing ring; 2132. First fixed flange; 2133. First insertion part; 214. First connecting flange; 2141. First flange plate; 2142. First connecting pipe; 2143. First communication hole;

[0037] 22. Second main oil cylinder; 221. Second cylinder barrel; 2211. Second oil inlet; 222. Second piston rod; 223. Second cylinder base; 2231. Second sealing ring; 2232. Second fixed flange; 2233. Second insertion part; 224. Second connecting flange; 2241. Second flange plate; 2242. Second connecting pipe; 2243. Second communication hole;

[0038] 3. Main valve group; 31. First outlet oil port; 32. Second outlet oil port;

[0039] 4. Pump group; 41. Oil pump;

[0040] 5. Connecting part; 51. First connecting part; 52. Second connecting part; 53. Connecting pipe;

[0041] 6. First waist-shaped hole; 7. Second waist-shaped hole. Detailed implementation mode

[0042] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0044] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0046] Embodiment 1

[0047] As Figures 2 to 8As shown in the figure, this embodiment provides a concrete pump truck, which includes a vehicle frame 1, an oil cylinder group 2, a main valve group 3, and a pump group 4. The pump group 4 is arranged at the head of the vehicle frame 1, the oil cylinder group 2 is arranged at the tail of the vehicle frame 1, and the main valve group 3 is arranged on the vehicle frame 1 and located between the oil cylinder group 2 and the pump group 4. The main valve group 3 is connected to the oil cylinder group 2 through a hydraulic oil pipe, and the main valve group 3 is connected to the pump group 4 through a hydraulic oil pipe. In this concrete pump truck, the main valve group 3 is moved from above the oil cylinder group 2 to between the oil cylinder group 2 and the pump group 4. This setting, on the one hand, frees up the space above the oil cylinder group 2, avoiding the situation that the main valve group 3 is very likely to interfere with the boom when the boom is in the retracted driving state, and at the same time, it also increases the folding space of the boom, facilitating the arrangement of a boom with a larger cross-section; on the other hand, the main valve group 3 is located between the oil cylinder group 2 and the pump group 4, thereby shortening the hydraulic circuit between the main valve group 3 and the oil cylinder group 2, shortening the hydraulic circuit between the main valve group 3 and the pump group 4, and thus reducing the manufacturing cost, reducing the pressure loss, and improving the performance index.

[0048] Optionally, the vehicle frame of the concrete pump truck includes two longitudinals arranged at intervals, and a mounting plate is fixedly arranged between the two longitudinals arranged at intervals. The mounting plate is fixed to the longitudinal through bolts, and the main valve group 3 is fixedly arranged on the mounting plate through fixing bolts. In this embodiment, the mounting plate, on the one hand, provides a mounting and fixing position for the main valve group 3, and on the other hand, improves the overall strength of the vehicle frame. The main valve group 3 is located between the two longitudinals, and the two longitudinals can prevent external objects from colliding with the main valve group 3.

[0049] Optionally, the pump group 4 includes at least two oil pumps 41, and at least two oil pumps 41 are all connected to the main oil inlet of the main valve group 3. In this embodiment, increasing the number of oil pumps 41 can improve the oil pumping efficiency and the maximum oil pressure of the oil cylinder group 2. Specifically, this embodiment is provided with 2 oil pumps 41. In other embodiments, 3 or 4 oil pumps can also be set, etc.

[0050] Optionally, the oil cylinder group 2 includes a first main oil cylinder 21 and a second main oil cylinder 22. The first main oil cylinder 21 is provided with at least two first oil inlets 2111, and the first oil inlets 2111 are connected to the rodless cavity of the first main oil cylinder 21. The second main oil cylinder 22 is provided with at least two second oil inlets 2211, and the second oil inlets 2211 are connected to the rodless cavity of the second main oil cylinder 22. The main valve group 3 is provided with at least two first oil outlets 31 and at least two second oil outlets 32. The first oil inlets 2111 and the first oil outlets 31 are connected in one-to-one correspondence, and the second oil inlets 2211 and the second oil outlets 32 are connected in one-to-one correspondence. In this embodiment, the sum of the cross-sectional areas of at least two first oil inlets 2111 is the total oil inlet cross-sectional area of the rodless cavity of the first main oil cylinder 21. As the number of first oil inlets 2111 increases, the total oil inlet cross-sectional area of the rodless cavity of the first main oil cylinder 21 increases, thereby increasing the oil inlet speed of the rodless cavity of the first main oil cylinder 21 and reducing the pressure loss at the same time.

[0051] Optionally, the oil cylinder group 2 includes a first main oil cylinder 21 and a second main oil cylinder 22. The first main oil cylinder 21 includes a first cylinder barrel 211, a first piston rod 212 and a first cylinder base 213. The first piston rod 212 is slidably disposed within the first cylinder barrel 211 and is in sealing cooperation with one end of the first cylinder barrel 211. The first cylinder base 213 is welded to the other end of the first cylinder barrel 211 and closes the other end of the first cylinder barrel 211. The second main oil cylinder 22 includes a second cylinder barrel 221, a second piston rod 222 and a second cylinder base 223. The second piston rod 222 is slidably disposed within the second cylinder barrel 221 and is in sealing cooperation with one end of the second cylinder barrel 221. The second cylinder base 223 is welded to the other end of the second cylinder barrel 221 and closes the other end of the second cylinder barrel 221. In this embodiment, compared with the case where the first cylinder base 213 is fixedly connected to the other end of the first cylinder barrel 211 by threads, welding the first cylinder base 213 to the other end of the first cylinder barrel 211 can, on the one hand, reduce the overall mass of the first main oil cylinder 21, and on the other hand, improve the stability of the connection between the first cylinder base 213 and the first cylinder barrel 211. The effect of welding the second cylinder base 223 to the other end of the second cylinder barrel 221 is the same as that of welding the first cylinder base 213 to the other end of the first cylinder barrel 211, and will not be elaborated here.

[0052] Optionally, the first cylinder base 213 includes a first sealing ring 2131, a first fixing flange 2132 and a first insertion portion 2133 that are fixedly connected to each other. The first sealing ring 2131 is sleeved on the outer periphery of the first insertion portion 2133. The first insertion portion 2133 is inserted into the other end of the first cylinder barrel 211 and clamps the first sealing ring 2131 with the inner wall of the first cylinder barrel 211. The first fixing flange 2132 is welded to the other end of the first cylinder barrel 211. The second cylinder base 223 includes a second sealing ring 2231, a second fixing flange 2232 and a second insertion portion 2233 that are fixedly connected to each other. The second sealing ring 2231 is sleeved on the outer periphery of the second insertion portion 2233. The second insertion portion 2233 is inserted into the other end of the second cylinder barrel 221 and clamps the second sealing ring 2231 with the inner wall of the second cylinder barrel 221. The second fixing flange 2232 is welded to the other end of the second cylinder barrel 221. In this embodiment, the first insertion portion 2133 and the inner wall of the first cylinder barrel 211 clamp the first sealing ring 2131 to achieve a sealed connection between the first insertion portion 2133 and the first cylinder barrel 211. The second insertion portion 2233 and the inner wall of the second cylinder barrel 221 clamp the second sealing ring 2231 to achieve a sealed connection between the second insertion portion 2233 and the second cylinder barrel 221. Specifically, both the first sealing ring 2131 and the second sealing ring 2231 are made of rubber material.

[0053] Optionally, a first limiting groove is provided on the outer peripheral wall of the first plugging portion 2133 along the circumferential direction of the first plugging portion 2133, and the first sealing ring 2131 is arranged in the first limiting groove; a second limiting groove is provided on the outer peripheral wall of the second plugging portion 2233 along the circumferential direction of the second plugging portion 2233, and the second sealing ring 2231 is arranged in the second limiting groove. In this embodiment, during the process of inserting the first plugging portion 2133 into the first cylinder barrel 211, the first sealing ring 2131 will move relative to the first plugging portion 2133 along the moving direction of the first plugging portion 2133, and thus the problem of sealing failure may occur. To avoid this problem, the first sealing ring 2131 is arranged in the first limiting groove to prevent the first sealing ring 2131 from moving relative to the first plugging portion 2133 along the moving direction of the first plugging portion 2133, and thus the problem of sealing failure between the first plugging portion 2133 and the first cylinder barrel 211 caused by the first sealing ring 2131 can be avoided. The function of the second limiting groove is the same as that of the first limiting groove, and will not be described in detail here.

[0054] Optionally, the first main oil cylinder 21 further includes a first connecting flange 214, the first connecting flange 214 is fixedly arranged on the peripheral wall of the first cylinder barrel 211, the first connecting flange 214 is provided with a first communication hole 2143, the first communication hole 2143 communicates with the rod chamber of the first main oil cylinder 21, the second main oil cylinder 22 further includes a second connecting flange 224, the second connecting flange 224 is fixedly arranged on the peripheral wall of the second cylinder barrel 221, the second connecting flange 224 is provided with a second communication hole 2243, the second communication hole 2243 communicates with the rod chamber of the second main oil cylinder 22; the concrete pump truck further includes a connecting member 5, the connecting member 5 includes a connecting pipe 53 and first connecting portions 51 and second connecting portions 52 arranged at both ends of the connecting pipe 53, the first connecting portion 51 is fixedly connected with the first connecting flange 214, so that one end of the connecting pipe 53 is hermetically communicated with the first communication hole 2143, the second connecting portion 52 is fixedly connected with the second connecting flange 224, so that the other end of the connecting pipe 53 is hermetically communicated with the second communication hole 2243. In this embodiment, the first connecting flange 214 includes a first flange plate 2141 and a first connecting pipe 2142, the first communication hole 2143 is located in the first connecting pipe 2142, one end of the first connecting pipe 2142 is fixedly connected with the barrel wall of the first cylinder barrel 211 and communicates with the rod chamber of the first main oil cylinder 21, the other end of the first connecting pipe 53 penetrates through the first flange plate 2141 and is fixedly connected with the first flange plate 2141, the first connecting portion 51 is fixedly connected with the first flange plate 2141, so that one end of the connecting pipe 53 is opposite to the first communication hole 2143 of the first connecting pipe 2142.

[0055] The second connection flange 224 includes a second flange plate 2241 and a second connecting pipe 2242. The second communication hole 2243 is located in the second connecting pipe 2242. One end of the second connecting pipe 2242 is fixedly connected to the cylinder wall of the second cylinder barrel 221 and communicates with the rod chamber of the second main oil cylinder 22. The other end of the second connecting pipe 53 passes through the second flange plate 2241 and is fixedly connected to the second flange plate 2241. The second connecting portion 52 is fixedly connected to the second flange plate 2241 so that the other end of the connecting pipe 53 is opposite to the second communication hole 2243 of the second connecting pipe 2242.

[0056] Optionally, the first connecting portion 51 and the second connecting portion 52 are both provided with first waist-shaped holes 6. The first waist-shaped holes 6 extend along the interval direction between the first main oil cylinder 21 and the second main oil cylinder 22. The first connection flange 214 and the second connection flange 224 are both provided with second waist-shaped holes 7. The second waist-shaped holes 7 extend along the sliding direction of the first piston rod 212. The first waist-shaped holes 6 and the corresponding second waist-shaped holes 7 are opposite to each other. The connecting member 5 further includes a bolt and a nut. The bolt passes through the first waist-shaped hole 6 and the second waist-shaped hole 7 and is screwed with the nut. In this embodiment, when installing the first main oil cylinder 21 and the second main oil cylinder 22, due to relevant errors, it is impossible to ensure the accuracy of the relative positions of the first connection flange 214 and the second connection flange 224. For this reason, the bolt can slide relatively in the first waist-shaped hole 6 and the second waist-shaped hole 7 respectively, so as to adjust the relative positions of the first connecting portion 51 and the first connection flange 214, and the relative positions of the second connecting portion 52 and the second connection flange 224, which is beneficial to the assembly of the connecting member 5 with the first main oil cylinder 21 and the second main oil cylinder 22 respectively.

[0057] Optionally, the inner diameter of one end of the connecting pipe 53 is larger than the inner diameter of the first communication hole 2143, and the inner diameter of the other end of the connecting pipe 53 is larger than the inner diameter of the second communication hole 2243. In this embodiment, when adjusting the relative position of the first connecting portion 51 and the first connection flange 214, the inner diameter of one end of the connecting pipe 53 is larger than the inner diameter of the first communication hole 2143, so that the connecting pipe wall does not block the first communication hole 2143, and thus does not affect the flow rate of the oil entering the rod chamber of the first main oil cylinder 21.

[0058] When adjusting the relative position of the second connecting portion 52 and the second connection flange 224, the inner diameter of the other end of the connecting pipe 53 is larger than the inner diameter of the second communication hole 2243, so that the connecting pipe wall does not block the second communication hole 2243, and thus does not affect the flow rate of the oil entering the rod chamber of the second main oil cylinder 22.

[0059] Embodiment Two

[0060] Optionally, the oil cylinder group 2 includes a first main oil cylinder 21 and a second main oil cylinder 22. The first main oil cylinder 21 is provided with at least two first oil inlets 2111 which are communicated with the rodless cavity of the first main oil cylinder 21. The second main oil cylinder 22 is provided with at least two second oil inlets 2211 which are communicated with the rodless cavity of the second main oil cylinder 22. The first outlet oil port 31 of the main valve group 3 is simultaneously communicated with at least two first oil inlets 2111, and the second outlet oil port 32 of the main valve group 3 is simultaneously communicated with at least two second oil inlets 2211. In this embodiment, the sum of the cross-sectional areas of at least two first oil inlets 2111 is the total oil inlet cross-sectional area of the rodless cavity of the first main oil cylinder 21. With the increase of the first oil inlets 2111, the total oil inlet cross-sectional area of the rodless cavity of the first main oil cylinder 21 is increased, thereby increasing the oil inlet speed of the rodless cavity of the first main oil cylinder 21 and reducing the pressure loss at the same time. Specifically, the concrete pump truck includes a first hydraulic pipe and a second hydraulic pipe. The first hydraulic pipe includes a first hydraulic main pipe and at least two first hydraulic branch pipes. One end of the first hydraulic main pipe is communicated with the first outlet oil port 31 of the main valve group 3, the other end of the first hydraulic main pipe is communicated with one ends of at least two first hydraulic branch pipes, and the other ends of at least two first hydraulic branch pipes are communicated with the corresponding first oil inlets 2111. The second hydraulic pipe includes a second hydraulic main pipe and at least two second hydraulic branch pipes. One end of the second hydraulic main pipe is communicated with the second outlet oil port 32 of the main valve group 3, the other end of the second hydraulic main pipe is communicated with one ends of at least two second hydraulic branch pipes, and the other ends of at least two second hydraulic branch pipes are communicated with the corresponding second oil inlets 2211.

[0061] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Concrete pump truck, characterized in that: The invention comprises a vehicle frame (1), a cylinder group (2), a main valve group (3) and a pump group (4), wherein the pump group (4) is arranged at the head of the vehicle frame (1), the cylinder group (2) is arranged at the tail of the vehicle frame (1), the main valve group (3) is arranged on the vehicle frame (1) and is located between the cylinder group (2) and the pump group (4), the main valve group (3) is connected to the cylinder group (2) through a hydraulic oil pipe, and the main valve group (3) is connected to the pump group (4) through a hydraulic oil pipe.

2. The concrete pump truck according to claim 1, characterized in that: The pump group (4) comprises at least two oil pumps (41), and at least two of the oil pumps (41) are both connected to the main oil inlet of the main valve group (3).

3. The concrete pump truck according to claim 1, characterized in that: The oil cylinder group (2) comprises a first master oil cylinder (21) and a second master oil cylinder (22), the first master oil cylinder (21) being provided with at least two first oil inlets (2111), the first oil inlets (2111) being communicated with the rodless chamber of the first master oil cylinder (21), the second master oil cylinder (22) being provided with at least two second oil inlets (2211), the second oil inlets (2211) being communicated with the rodless chamber of the second master oil cylinder (22); The first oil outlet port (31) of the main valve group (3) is simultaneously connected to at least two of the first oil inlets (2111), and the second oil outlet port (32) of the main valve group (3) is simultaneously connected to at least two of the second oil inlets (2211).

4. The concrete pump truck according to claim 1, characterized in that: The oil cylinder group (2) comprises a first master oil cylinder (21) and a second master oil cylinder (22), the first master oil cylinder (21) being provided with at least two first oil inlets (2111), the first oil inlets (2111) being communicated with the rodless chamber of the first master oil cylinder (21), the second master oil cylinder (22) being provided with at least two second oil inlets (2211), the second oil inlets (2211) being communicated with the rodless chamber of the second master oil cylinder (22); The main valve group (3) is provided with at least two first oil outlet ports (31) and at least two second oil outlet ports (32); the first oil inlet ports (2111) are connected to the first oil outlet ports (31) in a one-to-one correspondence; and the second oil inlet ports (2211) are connected to the second oil outlet ports (32) in a one-to-one correspondence.

5. The concrete pump truck according to any one of claims 1 to 4, characterized in that: The oil cylinder group (2) comprises a first master oil cylinder (21) and a second master oil cylinder (22); the first master oil cylinder (21) comprises a first cylinder barrel (211), a first piston rod (212) and a first cylinder seat (213); the first piston rod (212) is slidably disposed in the first cylinder barrel (211) and is sealed with one end of the first cylinder barrel (211); the first cylinder seat (213) is welded to the other end of the first cylinder barrel (211) and seals the other end of the first cylinder barrel (211); The second master oil cylinder (22) comprises a second cylinder barrel (221), a second piston rod (222) and a second cylinder seat (223); the second piston rod (222) is slidably disposed in the second cylinder barrel (221) and is sealed with one end of the second cylinder barrel (221); the second cylinder seat (223) is welded to the other end of the second cylinder barrel (221) and seals the other end of the second cylinder barrel (221).

6. The concrete pump truck according to claim 5, characterized in that: The first cylinder seat (213) comprises a first sealing ring (2131), a first fixing flange (2132) fixed to each other, and a first plug-in portion (2133); the first sealing ring (2131) is sleeved on the outer periphery of the first plug-in portion (2133); the first plug-in portion (2133) is inserted into the other end of the first cylinder barrel (211) and clamps the first sealing ring (2131) with the inner wall of the first cylinder barrel (211); the first fixing flange (2132) is welded to the other end of the first cylinder barrel (211); The second cylinder seat (223) comprises a second sealing ring (2231), a second fixing flange (2232) fixed to each other and a second plug-in portion (2233), the second sealing ring (2231) is sleeved on the outer circumference of the second plug-in portion (2233), the second plug-in portion (2233) is inserted into the other end of the second cylinder barrel (221) and clamps the second sealing ring (2231) with the inner wall of the second cylinder barrel (221), and the second fixing flange (2232) is welded to the other end of the second cylinder barrel (221).

7. The concrete pump truck according to claim 6, characterized in that: The outer peripheral wall of the first plug-in portion (2133) is provided with a first limiting groove around the circumference of the first plug-in portion (2133), and the first sealing ring (2131) is arranged in the first limiting groove; A second limiting groove is arranged on the outer peripheral wall of the second plug-in portion (2233) around the circumference of the second plug-in portion (2233), and the second sealing ring (2231) is arranged in the second limiting groove.

8. The concrete pump truck according to claim 5, characterized in that: The first master cylinder (21) further comprises a first connecting flange (214), the first connecting flange (214) being fixedly mounted on the peripheral wall of the first cylinder barrel (211), the first connecting flange (214) being provided with a first connecting hole (2143), the first connecting hole (2143) being connected to the rod chamber of the first master cylinder (21), and the second master cylinder (22) further comprises a second connecting flange (224), the second connecting flange (224) being fixedly mounted on the peripheral wall of the second cylinder barrel (221), the second connecting flange (224) being provided with a second connecting hole (2243), the second connecting hole (2243) being connected to the rod chamber of the second master cylinder (22); The invention also comprises a connecting piece (5), wherein the connecting piece (5) comprises a connecting pipe (53) and a first connecting portion (51) and a second connecting portion (52) arranged at both ends of the connecting pipe (53), wherein the first connecting portion (51) is fixedly connected to the first connecting flange (214) so ​​that one end of the connecting pipe (53) is sealed and connected to the first connecting hole (2143), and the second connecting portion (52) is fixedly connected to the second connecting flange (224) so ​​that the other end of the connecting pipe (53) is sealed and connected to the second connecting hole (2243).

9. The concrete pump truck according to claim 8, characterized in that: The first connecting portion (51) and the second connecting portion (52) are both provided with a first waist-shaped hole (6), the first waist-shaped hole (6) extending along the spacing direction of the first master oil cylinder (21) and the second master oil cylinder (22), the first connecting flange (214) and the second connecting flange (224) are both provided with a second waist-shaped hole (7), the second waist-shaped hole (7) extending along the sliding direction of the first piston rod (212), and the first waist-shaped hole (6) and the corresponding second waist-shaped hole (7) are opposite to each other; The connecting piece (5) further comprises a bolt and a nut, wherein the bolt passes through the first waist-shaped hole (6) and the second waist-shaped hole (7) and is threadedly connected with the nut.

10. The concrete pump truck according to claim 9, characterized in that: The inner diameter of one end of the connecting tube (53) is greater than the inner diameter of the first connecting hole (2143), and the inner diameter of the other end of the connecting tube (53) is greater than the inner diameter of the second connecting hole (2243).

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