Leak detection device and method for concrete pumping unit

Abstract

The present application discloses a leak detection device and a leak detection method for a concrete pumping unit, and relates to the technical field of leakage detection. The leak detection device for a concrete pumping unit includes a pumping module, a plugging module and a displacement detection module; the pumping module includes a pumping drive assembly, a distribution assembly and a discharge pipe, and the distribution assembly connects the pumping drive assembly with the discharge pipe; the plugging module is arranged on the discharge pipe, and is used to plug the outlet of the discharge pipe so that a closed cavity is formed in the discharge pipe; the displacement detection module is arranged on the pumping drive assembly, and is used to detect the extension amount of the piston rod in the pumping drive assembly. The leak detection device for a concrete pumping unit disclosed in the present application can indirectly obtain the leakage of the test liquid through the extension amount of the piston rod, such as the leakage amount and leakage condition of the test liquid, so that the leakage of the test liquid is more intuitive and accurate, which greatly reduces the measurement difficulty, and can also provide basic detection data for the product's working condition applicability research.

Description

Technical Field

[0001] The present application relates to the technical field of leakage detection, and in particular to a leakage detection device and a leakage detection method for a concrete pumping unit. Background Art

[0002] Concrete pump trucks are important construction machinery for various types of engineering buildings in modern times. The pumping unit is the core power mechanism of the pump truck operation. Its function is to convert the pressure energy provided by the hydraulic system into the reciprocating motion of the concrete piston in the concrete cylinder, so that the concrete piston pushes the concrete through the concrete cylinder, distribution valve, and discharge pipe to reach the construction destination.

[0003] In order to prevent the increase of pumping resistance during concrete pumping and ensure the pumpability of concrete, it is necessary to maintain the water content in the concrete mix as much as possible. Therefore, the sealing of the pumping unit and pipeline is extremely important for maintaining the water content during concrete pumping.

[0004] When the pumping unit is working, the eyeglass plate (wear-resistant plate) and the cutting ring are flatly fitted. Due to processing and installation errors, it is inevitable that there is a gap between the fitting surfaces, and the gap values ​​in each direction are uncertain, making it difficult to measure. The existing detection method usually only uses a feeler gauge to measure the gap, which cannot quantitatively measure the amount or speed of water leakage under certain working conditions. Summary of the invention

[0005] The purpose of the present application is to provide a concrete pumping unit leakage detection device and a leakage detection method to solve the deficiencies in the prior art.

[0006] To achieve the above objectives, in a first aspect, the present application provides a concrete pumping unit leakage detection device, comprising:

[0007] A pumping module, comprising a pumping drive assembly, a distribution assembly and a discharge pipe, wherein the distribution assembly enables the pumping drive assembly to communicate with the discharge pipe;

[0008] a blocking module, disposed at the discharge pipe, for blocking the outlet of the discharge pipe, so that a closed cavity for filling the test liquid is formed in the discharge pipe; and

[0009] The displacement detection module is arranged in the pumping drive assembly and is used to detect the extension amount of the piston rod in the pumping drive assembly.

[0010] In combination with the first aspect, in a possible implementation, the pumping drive assembly includes two pumping cylinders working alternately, each of the pumping cylinders is provided with a displacement detection module, and the displacement detection module is used to detect the extension amount of the piston rod in the corresponding pumping cylinder.

[0011] In combination with the first aspect, in a possible implementation, the displacement detection module is a laser rangefinder, the laser rangefinder is detachably disposed on the pumping drive assembly, and a laser beam emitted by the laser rangefinder is parallel to the axis of the piston rod.

[0012] In combination with the first aspect, in a possible implementation manner, the laser rangefinder is detachably disposed on the pumping drive assembly via a magnetic seat.

[0013] In combination with the first aspect, in a possible implementation, the displacement detection module further includes a display, and the display is electrically connected to the laser rangefinder, and is used to display the measured extension amount of the piston rod in real time.

[0014] In combination with the first aspect, in a possible implementation manner, the blocking module includes:

[0015] A plugging cover is disposed at the outlet side of the discharge pipe, and the plugging cover and the discharge pipe are in a sealed fit; and

[0016] A pipe clamp is used to fix the plugging cover on the discharge pipe.

[0017] In combination with the first aspect, in a possible implementation manner, the plugging module further includes an exhaust component, and the exhaust component includes:

[0018] an exhaust pipe, disposed on the plugging cover and connected to the sealed cavity; and

[0019] The valve is arranged on the exhaust pipe and is used to control the opening and closing of the exhaust pipe.

[0020] To achieve the above purpose, in a second aspect, the present application further provides a concrete pumping unit leakage detection method, which uses the concrete pumping unit leakage detection device provided according to the above first aspect, and the concrete pumping unit leakage detection method comprises:

[0021] Blocking the outlet of the discharge pipe to form a closed cavity, and filling the closed cavity with the test liquid;

[0022] Pressurizing the sealed chamber by the pumping drive assembly and maintaining the pressurization time;

[0023] Obtaining the extension amount of the piston rod within a preset pressurization time;

[0024] A leakage analysis is performed based on the protrusion.

[0025] In combination with the second aspect, in a possible implementation manner, the performing leakage analysis according to the extension amount includes obtaining a leakage amount and a leakage speed;

[0026] The leakage amount is π*D*L, and the leakage speed is π*D*L / T;

[0027] Wherein, L is the extension amount of the piston rod, T is the preset pressurization time, and D is the inner diameter of the concrete cylinder where the piston rod that pressurizes the closed cavity is located.

[0028] In conjunction with the second aspect, in a possible implementation manner, filling the closed cavity with the test liquid includes:

[0029] Filling the hopper of the pumping module with the test liquid;

[0030] Pumping the test liquid in the hopper into the discharge pipe using the pumping drive assembly;

[0031] Determining that the test liquid continuously overflows from the outlet of the discharge pipe, and blocking the outlet of the discharge pipe;

[0032] The pumping drive assembly is placed in a pumping pressure-maintaining state.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present application provides a leak detection device and a leak detection method for a concrete pumping unit. The leak detection device for a concrete pumping unit connects a pumping drive assembly with a discharge pipe through a distribution assembly, and then the outlet of the discharge pipe is blocked by a blocking module to form a closed cavity in the discharge pipe. When leak detection is performed, the closed cavity is filled with a test liquid, and then the closed cavity is pressurized by the pumping drive assembly. By utilizing the incompressibility of the liquid, the test liquid in the closed cavity is forced to leak only to the gap between the distribution assembly and the discharge pipe by the pressure. As the test liquid leaks, the amount of the test liquid in the closed cavity gradually decreases, and the piston rod stroke in the pumping drive assembly also changes synchronously. Thus, the extension amount of the piston rod before and after the leakage can be obtained by the displacement detection module, and then the leakage analysis is performed according to the extension amount. The leak detection device for a concrete pumping unit provided by the present application can indirectly obtain the leakage of the test liquid through the extension amount of the piston rod, such as the leakage amount and leakage condition of the test liquid, so that the leakage of the test liquid is more intuitive and accurate, greatly reducing the difficulty of measurement.

[0035] In addition, different pressure values ​​can be set through the pumping drive assembly for each test, so as to obtain the leakage conditions of the concrete pumping unit under different pressure conditions, which can provide basic test data for the research on the working condition applicability of the product (pump truck).

[0036] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0038] Figure 1 A schematic structural diagram of a pumping module provided in an embodiment of the present application is shown;

[0039] Figure 2 A structural schematic diagram of a concrete pumping unit leakage detection device provided in an embodiment of the present application is shown;

[0040] Figure 3 Shows Figure 2 A schematic diagram of the partial structure of the distribution component in the leak detection device of the concrete pumping unit shown;

[0041] Figure 4 Shows Figure 3 A schematic diagram of the cooperation between the eyeglass plate and the cutting ring in the distribution assembly shown;

[0042] Figure 5 A schematic flow chart of a concrete pumping unit leakage detection method provided in an embodiment of the present application is shown;

[0043] Figure 6 A schematic flow chart of another concrete pumping unit leakage detection method provided in an embodiment of the present application is shown;

[0044] Figure 7 A schematic diagram of force analysis of the pressure of a concrete piston in a concrete cylinder and the set pressure of a pumping oil cylinder system provided in an embodiment of the present application is shown;

[0045] Figure 8 Shows Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0046] Fig. 9 Shows Figure 2 The schematic diagram of the structure of the plugging module in the leakage detection device of the concrete pumping unit is shown.

[0047] Description of reference numerals:

[0048] 10. Hydraulic system; 100. Pumping module; 110. Pumping drive assembly; 111. Concrete cylinder; 112. Concrete piston; 113. Pumping cylinder; 1130. Piston rod; 120. Water tank; 130. Hopper; 140. Distribution assembly; 141. Deflection mechanism; 142. Distribution valve; 143. Eyeglass plate; 144. Cutting ring; 150. Discharge pipe; 151. Closed chamber; 200. Blocking module; 210. Blocking cover; 220. Pipe clamp; 230. First sealing member; 240. Second sealing member; 250. Exhaust assembly; 251. Exhaust pipe; 252. Valve; 300. Displacement detection module; 310. Laser rangefinder; 320. Magnetic seat; 330. Display. DETAILED DESCRIPTION

[0049] The specific implementation of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present application, and is not used to limit the embodiment of the present application.

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0051] In the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0055] Embodiment 1

[0056] See also Figure 1 and Figure 2 In this embodiment, a concrete pumping unit leakage detection device is provided, which is applied to leakage detection in a concrete pumping unit.

[0057] In this embodiment, the concrete pumping unit leakage detection device includes a pumping module 100 , a plugging module 200 and a displacement detection module 300 .

[0058] The pumping module 100 is used for conveying concrete. The pumping module 100 includes a pumping drive assembly 110, a water tank 120, a hopper 130, a distribution assembly 140 and a discharge pipe 150. When the pumping module 100 performs concrete conveying, the water tank 120 is used to provide water to the pumping drive assembly 110, the hopper 130 is used to hold concrete to be pumped, and the distribution assembly 140 is used to connect the pumping drive assembly 110 with the discharge pipe 150 to deliver the concrete in the hopper 130 into the discharge pipe 150.

[0059] Furthermore, the pumping drive assembly 110 includes two concrete cylinders 111, concrete pistons 112 disposed in the two concrete cylinders 111, and two pumping oil cylinders 113 that work alternately. A water tank 120 is disposed between the two pumping oil cylinders 113 and the two concrete cylinders 111, and the two pumping oil cylinders 113 are powered by the hydraulic system 10. The piston rods 1130 in the pumping oil cylinders 113 are connected to the concrete pistons 112 in the corresponding concrete cylinders 111, and are used to drive the concrete pistons 112 to perform piston motion in the concrete cylinders 111. One end of the two concrete cylinders 111 away from the water tank 120 is connected to the hopper 130, and the distribution assembly 140 is used to make the discharge pipe 150 alternately connected to the two concrete cylinders 111.

[0060] See also Figure 2 , Figure 3 and Figure 4Specifically, the distribution assembly 140 includes a deflection mechanism 141 and a distribution valve 142. The deflection mechanism 141 is arranged on the hopper 130 and connected to the distribution valve 142. The distribution valve 142 is arranged in the hopper 130. The deflection mechanism 141 is used to drive the distribution valve 142 to switch between the two concrete cylinders 111, so that the distribution valve 142 is alternately connected to the two concrete cylinders 111. Further, a spectacle plate 143 is installed on one side of the hopper 130 corresponding to the two concrete cylinders 111. The end of the distribution valve 142 close to the concrete cylinder 111 is provided with a cutting ring 144 that is in surface contact with the spectacle plate 143. The end of the distribution valve 142 away from the concrete cylinder 111 is connected to the discharge pipe 150. The cooperation between the spectacle plate 143 and the cutting ring 144 has the function of sealing and wear resistance.

[0061] It is understandable that when the pumping module 100 is working, the eyeglass plate 143 and the cutting ring 144 are in a flat fit. Due to processing and installation errors, it is inevitable that there is a gap between the fitting surfaces, and the gap values ​​in each direction are uncertain, making it difficult to measure. To solve the above problems, in this embodiment, a displacement detection module 300 is provided on each pumping cylinder 113, and the displacement detection module 300 is used to detect the extension amount of the piston rod 1130 in the corresponding pumping cylinder 113.

[0062] At the same time, a plugging module 200 is disposed on the discharge pipe 150 , and the plugging module 200 is used to plug the outlet of the discharge pipe 150 , so that a closed cavity 151 is formed in the discharge pipe 150 , and the closed cavity 151 is used to be filled with a test liquid for leak detection.

[0063] Please read also Figure 5 , Figure 6 and Figure 7 This embodiment also provides a concrete pumping unit leakage detection method, which uses the concrete pumping unit leakage detection device provided above. The concrete pumping unit leakage detection method includes the following steps:

[0064] S100 : blocking the outlet of the discharge pipe 150 to form a closed cavity 151 , and filling the closed cavity 151 with a test liquid.

[0065] Specifically, the pumping module 100, the blocking module 200 and the displacement detection module 300 are installed in place. After the closed chamber 151 is filled with the test liquid, the distribution valve 142 is driven by the yaw mechanism 141 to maintain communication with one of the concrete cylinders 111 to ensure the airtightness of the closed chamber 151.

[0066] Optionally, the test liquid is water, and of course other non-corrosive liquids can also be selected. It should be understood that the above is only an example and is not intended to limit the scope of protection of this application.

[0067] S200: Pressurizing the sealed chamber 151 through the pumping drive assembly 110 and maintaining the pressurization time for a preset period of time.

[0068] Specifically, the corresponding pumping cylinder 113 is started, so that the piston rod 1130 of the pumping cylinder 113 pushes the concrete piston 112 in the concrete cylinder 111 to move, and compresses the test liquid in the closed chamber 151 with a certain pressure. Due to the incompressibility of the liquid, the test liquid can only leak to the matching gap between the eyeglass plate 143 and the cutting ring 144 under the pressure of the concrete piston 112. With the leakage of the test liquid, the amount of the test liquid in the closed chamber 151 will gradually decrease, and thus the piston rod 1130 of the pumping cylinder 113 will continue to extend, pushing the concrete piston 112 to compress the closed chamber 151.

[0069] It is understandable that if there is no gap between the eyeglass plate 143 and the cutting ring 144, there will be no leakage, and the piston rod 1130 of the pumping cylinder 113 will remain in place and will not continue to extend forward. Therefore, if there is a leakage, the length of the piston rod 1130 of the pumping cylinder 113 before and after the leakage will change, and this length is the extension amount of the piston rod 1130.

[0070] S300: Obtaining the extension amount of the piston rod 1130 within a preset pressurization time.

[0071] Specifically, the preset pressurization time can be freely adjusted according to the test requirements and is not specifically limited in this embodiment. Since the extension length of the piston rod 1130 will change before and after the leakage, the change can be measured by the corresponding displacement detection module 300. The principle is to define the displacement of the piston rod 1130 before pressurization as L1, and the displacement after the preset pressurization time as L2, where the extension amount of the piston rod 1130 is L=L1-L2.

[0072] S400: Leak analysis based on the extension amount.

[0073] Furthermore, step S400 performs leakage analysis based on the extension amount, including obtaining the leakage amount and leakage speed. Specifically, the extension amount of the piston rod 1130 is converted into the volume of the concrete cylinder 111 where the piston rod 1130 is located, wherein the leakage amount and leakage speed are calculated as follows:

[0074] The leakage amount is π*D*L; the leakage rate is π*D*L / T.

[0075] Wherein, L is the extension amount of the piston rod 1130 , T is the preset pressurization time, and D is the inner diameter of the concrete cylinder 111 where the piston rod 1130 that pressurizes the closed cavity 151 is located.

[0076] Furthermore, the relationship between the pressure of the concrete piston 112 in the concrete cylinder 111 and the system set pressure of the pumping oil cylinder 113 (eg Figure 7shown):

[0077] When friction is ignored, the pressure of the rodless chamber of the pumping cylinder (P1)*the effective area (A1)-the pressure of the rod chamber of the pumping cylinder (P2)*the effective area (A2)=the pressure of the concrete piston 112 in the concrete cylinder 111 (P0)*the cross-sectional area (A0) of the concrete cylinder 111.

[0078] It can be concluded that P0 = (P1*A1-P2*A2) / A0. For a specific product, A0, A1, A2, and P2 are all known fixed values.

[0079] Therefore, according to the concrete pumping unit leak detection method provided in this embodiment, different detection pressures can be set for leak detection, and the hydraulic system 10 pressure (P1)-leakage (Q) curve and the pipeline system pressure (P0)-leakage (Q) curve can be drawn. This helps users to identify the match with the actual working conditions in advance and prevent equipment failure due to excessive leakage during temporary construction.

[0080] It should also be noted that after the data collection is completed in the above step S400, the hydraulic system 10 is shut down and unloaded. If no further testing is performed, the displacement detection module 300 and the blocking module 200 should be removed.

[0081] Filling the sealed chamber 151 with the test liquid in the above step S200 includes the following steps:

[0082] S210 : Fill the hopper 130 in the pumping module 100 with the test liquid.

[0083] S220 : Pump the test liquid in the hopper 130 into the discharge pipe 150 using the pumping drive assembly 110 .

[0084] S230: Determine that the test liquid continuously overflows from the outlet of the discharge pipe 150 , and block the outlet of the discharge pipe 150 , so that the test liquid fills the entire sealed cavity 151 .

[0085] S240: Put the pumping drive assembly 110 into a pumping pressure-maintaining state.

[0086] In the above step S220, before the test liquid in the hopper 130 is pumped into the closed chamber 151 by the pumping drive assembly 110, an exhaust hole or an exhaust gap is reserved at the outlet of the plugging module 200 and the discharge pipe 150 to facilitate the discharge of gas in the closed chamber 151. When the test liquid is continuously discharged from the exhaust, the pumping drive assembly 110 is stopped and the exhaust hole or the exhaust gap is blocked.

[0087] Of course, in some embodiments, the test liquid can be directly injected from the outlet of the discharge pipe 150 .

[0088] The concrete pumping unit leakage detection device provided in this embodiment can indirectly obtain the leakage situation of the test liquid, such as the leakage amount and leakage situation of the test liquid, through the extension amount of the piston rod 1130, so that the leakage of the test liquid is more intuitive and accurate, which greatly reduces the measurement difficulty and has high measurement accuracy.

[0089] In addition, different pressure values ​​can be set through the pumping drive assembly 110 for each test, so as to obtain the leakage conditions of the concrete pumping unit under different pressure conditions, which can provide basic test data for the research on the working condition applicability of the product (pump truck).

[0090] Embodiment 2

[0091] See also Figures 1 to 9 In this embodiment, a concrete pumping unit leak detection device is provided, which is applied to leak detection in a concrete pumping unit. This embodiment is an improvement made on the technical basis of the above embodiment 1. Compared with the above embodiment 1, the difference is that:

[0092] See also Figure 2 and Figure 8 In this embodiment, the displacement detection module 300 includes a laser rangefinder 310 , a magnetic base 320 and a display 330 .

[0093] The laser rangefinder 310 is detachably mounted on the pumping drive assembly 110 via a magnetic mount 320 , and the laser beam emitted by the laser rangefinder 310 is parallel to the axis of the piston rod 1130 , wherein the laser beam irradiated to the end of the piston rod 1130 will be reflected back.

[0094] The display 330 is electrically connected to the laser rangefinder 310 and is used to display the measured extension in real time. The display 330 can be installed on the cylinder body of the pumping cylinder 113 or directly on the laser rangefinder 310.

[0095] In some embodiments, the laser rangefinder 310 may be a grating displacement sensor or an infrared displacement sensor, etc. It should be understood that the above is only an example and is not intended to limit the scope of protection of the present application.

[0096] See also Figure 2 and Fig. 9 The plugging module 200 includes a plugging cover 210 and a pipe clamp 220. The plugging cover 210 is disposed at the outlet side of the discharge pipe 150, and the plugging cover 210 and the discharge pipe 150 are sealed. The pipe clamp 220 holds the discharge pipe 150 and the plugging cover 210, and is used to fix the plugging cover 210 on the discharge pipe 150.

[0097] Furthermore, a first seal 230 is provided between the plugging cover 210 and the discharge pipe 150, and a second seal 240 is provided on the inner wall of the tube clamp 220. Through the cooperation of the first seal 230 and the second seal 240, the sealing performance at the outlet of the discharge pipe 150 is improved to prevent leakage.

[0098] In some embodiments, the plugging module 200 also includes an exhaust assembly 250, and the exhaust assembly 250 includes an exhaust pipe 251 and a valve 252. Among them, the exhaust pipe 251 is arranged on the plugging cover 210 and is connected to the closed chamber 151. Furthermore, the inlet of the exhaust pipe 251 is close to the upper wall surface of the outlet of the discharge pipe 150, so that the gas in the closed chamber 151 can be discharged smoothly. The valve 252 is arranged on the exhaust pipe 251, and is used to control the conduction and cutoff of the exhaust pipe 251. Specifically, when the test liquid continuously overflows from the exhaust pipe 251, the valve 252 can be closed. Optionally, the valve 252 is selected as a ball valve, and of course a valve with sealing properties can also be selected.

[0099] The concrete pumping unit leak detection device provided in this embodiment exhausts air through the exhaust assembly 250, thereby eliminating the influence of inaccurate detection results caused by compressed air, and also avoiding high-temperature and high-pressure cavitation caused by compressed air.

[0100] The above describes in detail the optional implementation methods of the embodiments of the present application in combination with the accompanying drawings. However, the embodiments of the present application are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present application, various simple modifications can be made to the technical scheme of the embodiments of the present application, and these simple modifications all belong to the protection scope of the embodiments of the present application.

[0101] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present application will not further describe various possible combinations.

[0102] In addition, the various implementation methods of the embodiments of the present application may be arbitrarily combined, and as long as they do not violate the ideas of the embodiments of the present application, they should also be regarded as the contents disclosed in the embodiments of the present application.

Claims

1. A leak detection device for a concrete pumping unit, characterized in that: include: A pumping module (100) comprises a pumping drive assembly (110), a distribution assembly (140), a hopper (130) and a discharge pipe (150), wherein the distribution assembly (140) enables the pumping drive assembly (110) to communicate with the discharge pipe (150), and the distribution assembly (140) comprises a deflection mechanism (141) and a distribution valve (142), wherein the deflection mechanism (141) is arranged on the hopper (130) and connected to the distribution valve (142), and the distribution valve (142) is arranged on the hopper (130), the deflection mechanism (141) is used to drive the distribution valve (142) to switch between the two concrete cylinders (111) of the pumping drive assembly (110), so that the distribution valve (142) is alternately connected to the two concrete cylinders (111); a spectacle plate (143) is installed on one side of the hopper (130) corresponding to the two concrete cylinders (111), and a cutting ring (144) is provided at one end of the distribution valve (142) close to the concrete cylinder (111) and is in surface contact with the spectacle plate (143); A blocking module (200) is disposed on the discharge pipe (150) and is used to block the outlet of the discharge pipe (150) so that a closed cavity (151) for filling the test liquid is formed in the discharge pipe (150); and A displacement detection module (300) is arranged in the pumping drive assembly (110) and is used to detect the extension amount of the piston rod (1130) in the pumping drive assembly (110); Wherein, the blocking module (200) comprises: a plugging cover (210) disposed at the outlet side of the discharge pipe (150), wherein the plugging cover (210) and the discharge pipe (150) are in sealing cooperation; and A pipe clamp (220) is used to fix the plugging cover (210) on the discharge pipe (150).

2. The concrete pumping unit leakage detection device according to claim 1, characterized in that: The pumping drive assembly (110) comprises two pumping cylinders (113) that work alternately, and each of the pumping cylinders (113) is provided with a displacement detection module (300), and the displacement detection module (300) is used to detect the extension amount of the piston rod (1130) in the corresponding pumping cylinder (113).

3. The concrete pumping unit leakage detection device according to claim 1, characterized in that: The displacement detection module (300) is a laser rangefinder (310), which is detachably arranged on the pumping drive assembly (110), and the laser beam emitted by the laser rangefinder (310) is parallel to the axis of the piston rod (1130).

4. The concrete pumping unit leakage detection device according to claim 3, characterized in that: The laser rangefinder (310) is detachably mounted on the pumping drive assembly (110) via a magnetic seat (320).

5. The concrete pumping unit leakage detection device according to claim 3, characterized in that: The displacement detection module (300) further comprises a display (330), wherein the display (330) is electrically connected to the laser rangefinder (310) and is used to display the measured extension amount of the piston rod (1130) in real time.

6. The concrete pumping unit leakage detection device according to claim 1, characterized in that: The plugging module (200) further comprises an exhaust assembly (250), wherein the exhaust assembly (250) comprises: an exhaust pipe (251), which is disposed on the blocking cover (210) and is in communication with the sealed chamber (151); and The valve (252) is arranged on the exhaust pipe (251) and is used to control the opening and closing of the exhaust pipe (251).

7. A method for leak detection of a concrete pumping unit, characterized in that: The concrete pumping unit leakage detection device according to any one of claims 1 to 6 is applied, and the concrete pumping unit leakage detection method comprises: The outlet of the discharge pipe (150) is blocked to form a closed cavity (151), and the closed cavity (151) is filled with a test liquid; Pressurizing the sealed chamber (151) through the pumping drive assembly (110) and maintaining the pressurization for a preset time period; Obtaining the extension amount of the piston rod (1130) within a preset pressurization time; A leakage analysis is performed based on the protrusion.

8. The concrete pumping unit leakage detection method according to claim 7, characterized in that: The leakage analysis according to the extension amount includes obtaining the leakage amount and the leakage speed; The leakage amount is π*D*L, and the leakage speed is π*D*L / T; Wherein, L is the extension amount of the piston rod (1130), T is the preset pressurization time, and D is the inner diameter of the concrete cylinder (111) where the piston rod (1130) that pressurizes the closed chamber (151) is located.

9. The concrete pumping unit leakage detection method according to claim 7, characterized in that: Filling the sealed chamber (151) with the test liquid comprises: Filling the hopper (130) of the pumping module (100) with a test liquid; Using the pumping drive assembly (110) to pump the test liquid in the hopper (130) into the discharge pipe (150); Determining that the test liquid continuously overflows from the outlet of the discharge pipe (150), and blocking the outlet of the discharge pipe (150); The pumping drive assembly (110) is placed in a pumping pressure-maintaining state.

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