Variable size pumping concrete delivery pipe step cleaning machine

Abstract

The application discloses a variable-size pumping concrete conveying pipeline step-by-step cleaning machine, which comprises a telescopic machine body assembly, a telescopic shovel plate and a telescopic scraper assembly. The telescopic machine body assembly is composed of a front telescopic machine body assembly and a rear telescopic machine body assembly. The rear telescopic machine body assembly comprises a rear machine body shell, a rear hydraulic cylinder and an advancing hydraulic cylinder. The rear machine body shell is composed of four rear machine body shell assemblies. Each rear machine body shell assembly is provided with a rear hydraulic cylinder. The advancing hydraulic cylinder is connected with the front telescopic machine body assembly through an advancing hydraulic top rod. The front telescopic machine body assembly is provided with a front hydraulic cylinder. The telescopic shovel plate is arranged at the front end of the front telescopic machine body assembly. The telescopic scraper assembly is arranged in front of the front telescopic machine body assembly. The front telescopic machine body assembly drives the telescopic scraper assembly to rotate. The telescopic machine body assembly and the telescopic scraper assembly can be driven to extend and retract through the hydraulic cylinders. The telescopic shovel plate can be combined to adapt to the cleaning of conveying pipelines with different diameters.

Description

Technical Field

[0001] This invention relates to the technical field of pipeline cleaning, and in particular to a step-type cleaning machine for variable-size pumped concrete conveying pipelines. Background Technology

[0002] Pumped concrete is a method of transporting and pouring concrete mixtures using concrete pumps or pump trucks along delivery pipes. It is an efficient way to transport concrete mixtures, offering speed and requiring less labor, and is particularly suitable for transporting and pouring large volumes of concrete and concrete for high-rise buildings. Currently, pumped concrete generally uses assembled steel pipes for transportation, and the inside of the delivery pipes needs to be cleaned after the work is completed.

[0003] Cleaning of high-rise concrete pumping pipelines commonly uses water washing, air washing, or a combination of both. Air washing uses compressed air to drive a cleaning device inserted into the pipeline, which removes concrete residue from the pipe wall. However, compressed air-driven cleaning devices are unstable and pose safety hazards. Improper operation can cause the cleaning device, along with concrete slurry, to spray out of the delivery pipe, creating an "air cannon" effect that can harm the health of on-site personnel. Water washing involves injecting water into the delivery pipeline and then activating the pipeline drive device to allow the water mixed with concrete to flow out from the pipeline outlet, which is usually located on the working surface. Concrete delivery pipelines require frequent cleaning (in principle, cleaning is required if pumping operations stop for more than 5 minutes). The water generated during cleaning cannot be disposed of on the working surface, making treatment difficult and resulting in water waste.

[0004] Patent application number 202021698789.X, entitled "A Cleaning Device for Pumped Concrete Conveying Pipelines," describes a device with a slanted tee at the inlet of the conveying pipeline and a take-up mechanism at the outlet. One end of the rope of the take-up mechanism is connected to a cleaning ball, which enters from the inlet section. The take-up mechanism pulls the cleaning ball to clean the conveying pipeline. Patent application number 201911351834.6, entitled "A Cleaning Device and Method for Concrete Conveying Pump Pipelines in Super High-Rise Buildings," describes a device comprising a vertical vibration mechanism, a lateral support and positioning mechanism, and a pump pipe dredging and cleaning mechanism, all coaxially connected in sequence. The coarse and fine grinding wheel supports of the pump pipe dredging and cleaning mechanism move in a circular motion along the inner wall of the pipeline under the drive of a rotating motor. The rotation of the coarse and fine grinding wheels and the vertical vibration impact remove concrete from the inner wall of the pipeline. Patent application number 202021681018.X, entitled "A Cleaning Device for Pumped Concrete Pipelines," describes a concrete pipeline equipped with a hinged guide section and several tail sections. A scraper is fixedly connected to the end of each tail section. A horizontal rotating shaft is rotatably mounted on the free end of the guide section. One end of the guide section is connected to a scraper rod perpendicular to the axis of the rotating shaft. Both ends of the scraper rod abut against the inner wall of the concrete pipeline. High-pressure air drives the scraper rod to move, which in turn moves the tail sections and guide sections along the concrete pipeline. A driving component drives the rotating shaft to rotate, thereby rotating the scraper rod to clean the concrete residue from the pipeline. Finally, the scraper rod cleans the concrete pipeline completely. The existing concrete cleaning equipment for conveying pipelines has the following problems: (1) It requires other auxiliary equipment, such as a winding mechanism, fixed support, vibration impact device and high-pressure air pump, and even requires changes to the pipeline structure, such as connecting the pipeline to a tee, which increases the equipment cost; (2) It lacks the function of automatic walking in the pipeline and is not suitable for cleaning concrete in ultra-high-rise or long-distance conveying pipelines; (3) Due to the need for auxiliary equipment and the lack of automatic walking function, the performance and effect of cleaning pipelines are unstable; (4) The size of the cleaning equipment is fixed and cannot adapt to the cleaning work of concrete in conveying pipelines with varying diameters. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a variable-size pumped concrete conveying pipeline walking cleaning machine. The machine comprises a cylindrical telescopic body assembly divided into a front telescopic body assembly and a rear telescopic body assembly. Hydraulic support devices are arranged around the front and rear telescopic body assemblies, and a forward hydraulic cylinder is installed between them to advance the telescopic body assembly along the conveying pipeline. A telescopic shovel plate with a diameter equal to that of the conveying pipeline and a rotatable telescopic scraper assembly are arranged in front of the cylindrical telescopic body assembly to remove concrete from the conveying pipeline, achieving the purpose of cleaning the pumped concrete pipeline. Simultaneously, the hydraulic cylinder drives the telescopic body assembly and the telescopic scraper assembly to extend and retract, and the combined telescopic shovel plate can adapt to cleaning conveying pipelines of different diameters.

[0006] The objective of this invention is achieved through the following technical solutions:

[0007] A variable-size pumped concrete conveying pipeline walking-type cleaning machine is used for cleaning the conveying pipeline. The walking-type cleaning machine includes a telescopic body assembly, a telescopic shovel, and a telescopic scraper assembly. The telescopic body assembly consists of a front telescopic body assembly and a rear telescopic body assembly. The rear telescopic body assembly includes a rear housing, a rear hydraulic cylinder, and a forward hydraulic cylinder. The rear housing is composed of four rear housing assemblies, each of which is equipped with one rear hydraulic cylinder. Five forward hydraulic cylinders are provided, with four mounted on the four rear housing assemblies and the remaining forward hydraulic cylinder installed in a forward hydraulic mounting hole in the center of the front side of the rear telescopic body assembly. The forward hydraulic push rod of the forward hydraulic cylinder is connected to the front telescopic body assembly. A front hydraulic cylinder is mounted on the front telescopic body assembly. The telescopic shovel is installed at the front end of the front telescopic body assembly. The telescopic scraper assembly is located in front of the front telescopic body assembly, and the front telescopic body assembly drives the telescopic scraper assembly to rotate.

[0008] The front telescopic body assembly includes a front body shell and a rotary motor. The front body shell is composed of four front body shell assemblies, each of which is equipped with a front hydraulic cylinder. The rotary motor is installed in a motor mounting hole in the middle of the front telescopic body assembly. A supporting hydraulic cylinder is fixed on the rotary motor. The supporting hydraulic cylinder's push rod is connected to the front body shell assembly. The rotary motor's rotary motor shaft passes through the rotary shaft hole of the telescopic shovel and is connected to the telescopic scraper assembly.

[0009] The telescopic scraper assembly includes a scraper, blades, and a scraper support hydraulic cylinder. The number of scrapers, blades, and scraper support hydraulic cylinders is the same. The scraper is located outside the blades. The base of the scraper support hydraulic cylinder is fixed on the rotary motor shaft, and the top rod of the scraper support hydraulic cylinder is connected to the scraper.

[0010] The telescopic shovel includes a main shovel, an auxiliary shovel, and a main shovel baffle. There are four main shovels and four auxiliary shovels. Each main shovel is connected to a corresponding front body shell assembly. The auxiliary shovels are installed in the auxiliary shovel mounting holes of the main shovels. A main shovel baffle is provided at the front of the four main shovels. The main shovel baffle has a rotating shaft hole.

[0011] The forward hydraulic cylinder located in the forward hydraulic mounting hole is mounted on the forward hydraulic base, and a support hydraulic cylinder is fixed on the forward hydraulic base. The support hydraulic cylinder push rod of the support hydraulic cylinder is connected to the rear body shell assembly.

[0012] The rear telescopic body assembly is supported on the inner wall of the conveying pipe by the rear hydraulic push rod of the rear hydraulic cylinder, and the front telescopic body assembly is supported on the inner wall of the conveying pipe by the front hydraulic push rod of the front hydraulic cylinder.

[0013] The rear hydraulic cylinder is installed in the rear hydraulic mounting hole of the rear telescopic body assembly, and the front hydraulic cylinder is installed in the front hydraulic mounting hole of the front telescopic body assembly.

[0014] The advantages of this invention are:

[0015] (1) The rotatable telescopic scraper assembly can perform the first cleaning of concrete residue in the conveying pipeline, and the telescopic shovel can perform the second cleaning of the conveying pipeline.

[0016] (2) The hydraulic support device and the forward hydraulic cylinder can increase the reaction force of the stepping cleaning machine, which can clean large areas of high-viscosity and clogged concrete.

[0017] (3) Compared with the traditional method of water washing and air washing, it can save water resources and reduce the harm of high-pressure gas to construction personnel, and is safer and more reliable;

[0018] (4) The telescopic body assembly and telescopic scraper assembly can be extended and retracted by the hydraulic cylinder, and the combined telescopic shovel can be adapted to clean conveying pipes of different diameters. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional position of the present invention;

[0021] Figure 3 for Figure 2 Cross-sectional view of AA in the middle;

[0022] Figure 4 for Figure 2 Cross-sectional view of BB in the middle;

[0023] Figure 5 for Figure 2 Cross-sectional view of CC in the middle;

[0024] Figure 6 for Figure 2 Cross-sectional view of DD in the middle;

[0025] Figure 7 for Figure 2 Cross-sectional view of the EE;

[0026] Figure 8 This is a schematic diagram of the stepping method of the present invention;

[0027] Figure 9 This is a schematic diagram illustrating the operation of the present invention;

[0028] like Figures 1-9 As shown in the figure, the markings represent:

[0029] a. Step-through cleaning machine, b. Delivery pipeline, c. Concrete, d. Cleaning direction, e. High-rise building;

[0030] 1. Telescopic body assembly; 2. Telescopic shovel; 3. Telescopic scraper assembly;

[0031] 11. Front telescopic body assembly; 12. Rear telescopic body assembly;

[0032] 111. Front housing, 112. Front hydraulic mounting hole, 113. Front hydraulic cylinder, 114. Front hydraulic push rod, 115. Motor mounting hole, 116. Rotary motor, 117. Rotary motor shaft, 118. Support hydraulic cylinder, 119. Support hydraulic cylinder push rod;

[0033] 121. Rear housing, 122. Rear hydraulic mounting hole, 123. Rear hydraulic cylinder, 124. Rear hydraulic push rod, 125. Forward hydraulic base, 126. Forward hydraulic mounting hole, 127. Forward hydraulic cylinder, 128. Forward hydraulic push rod;

[0034] 21. Main shovel plate; 22. Auxiliary shovel plate; 23. Main shovel baffle; 24. Auxiliary shovel plate mounting hole; 25. Rotary shaft hole.

[0035] 31. Scraper, 32. Blade, 33. Scraper support hydraulic cylinder, 34. Scraper support hydraulic cylinder push rod. Detailed Implementation

[0036] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0037] Example: Figures 1-9As shown, this embodiment relates to a step-by-step cleaning machine for variable-size pumped concrete conveying pipelines. This step-by-step cleaning machine (a) can be used to clean concrete (c) inside conveying pipelines (b) with different inner diameters. The conveying pipeline (b) is located next to a high-rise building (e), and the cleaning direction (d) of the step-by-step cleaning machine (a) is from top to bottom. The step-by-step cleaning machine (a) mainly includes a cylindrical telescopic body assembly (1), a telescopic shovel plate (2), and a telescopic scraper assembly (3). The telescopic body assembly (1) consists of a front telescopic body assembly (11) and a rear telescopic body assembly (12). The front telescopic body assembly (11) has a telescopic shovel plate (2) installed at its front end. The diameter of the telescopic shovel plate (2) is adapted to the inner diameter of the conveying pipeline (b). The telescopic shovel plate (2) can be used to remove the concrete (c) inside the conveying pipeline (b), thus performing a second cleaning of the conveying pipeline (b). The telescopic scraper assembly 3 is located in front of the front telescopic body assembly 11. The front telescopic body assembly 11 drives the telescopic scraper assembly 3 to rotate. Since the diameter of the telescopic scraper assembly 3 corresponds to the inner diameter of the conveying pipe b, the telescopic scraper assembly 3 can be used to remove the concrete c inside the conveying pipe b, which is the first cleaning of the conveying pipe b.

[0038] like Figures 1-7 As shown, the rear telescopic body assembly 12 includes a rear body shell 121, forward hydraulic cylinders 127, and a rear hydraulic support device. The rear body shell 121 is composed of four rear body shell assemblies, each a quarter-circular ring. A rear hydraulic support device is installed on the outer surface of each rear body shell assembly, and the four rear hydraulic support devices operate synchronously. Five forward hydraulic cylinders 127 are provided; four are installed on the front sides of the four rear body shell assemblies, and the remaining forward hydraulic cylinder 127 is installed in the forward hydraulic mounting hole 126 in the center of the front side of the rear telescopic body assembly. Each forward hydraulic cylinder 127 operates synchronously. The forward hydraulic push rod 128 of the forward hydraulic cylinder 127 is connected to the rear side of the front telescopic body assembly 11. The forward hydraulic cylinder 127 can drive the forward hydraulic push rod 128 on it to perform telescopic movement. The forward hydraulic cylinder 127 located in the forward hydraulic mounting hole 126 is mounted on the forward hydraulic base 125. A support hydraulic cylinder 118 is fixed on the forward hydraulic base 125. The support hydraulic cylinder push rod 119 of the support hydraulic cylinder 118 on the forward hydraulic base 125 is connected to the inner side of the rear body shell assembly. The support hydraulic cylinder 118 can drive the rear body shell assembly to move closer to or away from the forward hydraulic base 125.

[0039] The front telescopic body assembly 11 includes a front body shell 111, a rotary motor 116, and a front hydraulic support device. The front body shell 111 is composed of four front body shell assemblies, each of which is a quarter-circular ring. A front hydraulic support device is installed on the outer side of each front body shell assembly, and the four front hydraulic support devices work synchronously. The rotary motor 116 is installed in the motor mounting hole 115 in the middle of the front telescopic body assembly 11. A support hydraulic cylinder 118 is also fixed on the rotary motor 116. The support hydraulic cylinder push rod 119 of the support hydraulic cylinder 118 on the rotary motor 116 is connected to the inner side of the front body shell assembly. The support hydraulic cylinder 118 drives the front body shell assembly to move closer to or away from the rotary motor 116. The rotary motor shaft 117 of the rotary motor 116 passes through the rotary shaft hole 25 of the telescopic shovel 2 and is connected to the telescopic scraper assembly 3.

[0040] In this embodiment, each rear housing assembly / front housing assembly corresponds to four supporting hydraulic cylinders 118. The four supporting hydraulic cylinders 118 are respectively arranged in pairs at both ends of the rear housing assembly / front housing assembly, and the sixteen supporting hydraulic cylinders 118 on the rear housing assembly / front housing assembly work synchronously. The forward hydraulic push rods 128 of the forward hydraulic cylinders 127 on the rear housing assembly are respectively connected to the corresponding front housing assembly. The forward hydraulic push rods 128 of the forward hydraulic cylinders 127 located in the forward hydraulic mounting holes 126 are connected to the rotary motors 116.

[0041] like Figures 1-7 As shown, the telescopic scraper assembly 3 includes a scraper 31, a blade 32, and a scraper support hydraulic cylinder 33. The number of scrapers 31, blades 32, and scraper support hydraulic cylinders 33 is the same, with three in total. The scraper 31 is located outside the blade 32. The base of the scraper support hydraulic cylinder 33 is fixed on the rotary motor shaft 117, and the scraper support hydraulic cylinder push rod 34 is connected to the scraper 31. The three scraper support hydraulic cylinders 33 work synchronously. The rotary motor shaft 117 drives the scraper 31 to rotate, and the scraper 31 can remove the concrete c from the conveying pipe b. The scraper support hydraulic cylinders 33 drive the scraper 31 to extend and retract to adapt to conveying pipes b with different inner diameters. When the scraper support hydraulic cylinder push rod 34 is at its minimum stroke, the scraper 31 contacts the outside of the blade 32.

[0042] like Figures 1-7As shown, the telescopic shovel 2 includes a main shovel 21, auxiliary shovels 22, and a main shovel baffle 23. Four main shovels 21 and four auxiliary shovels 22 are provided. Each main shovel 21 is connected to a corresponding front telescopic body outer shell assembly. The auxiliary shovels 22 are installed in the auxiliary shovel mounting holes 24 of the main shovel 21. A main shovel baffle 23 is provided at the front of each of the four main shovels 21, and a rotating shaft hole 25 is provided on the main shovel baffle 23. The main shovels 21 move together with the front body outer shell assembly, meaning the main shovels 21 can move towards or away from the rotating motor shaft 117 to accommodate conveying pipes b with different inner diameters. During the movement of the main shovels 21, the main shovel baffle 23 can block the main shovels 21, serving as a guide and limiting element.

[0043] like Figures 1-7 As shown, the front hydraulic support device includes a front hydraulic cylinder 113 and a front hydraulic push rod 114. The front hydraulic cylinder 113 is installed in the front hydraulic mounting hole 112 of the front housing 111. The front hydraulic cylinder 113 can drive the front hydraulic push rod 114 to extend and retract. The front telescopic body assembly 11 is supported on the inner wall of the conveying pipe b by the front hydraulic cylinder 113 and the front hydraulic push rod 114. The rear hydraulic support device includes a rear hydraulic cylinder 123 and a rear hydraulic push rod 124. The rear hydraulic cylinder 123 is installed in the rear hydraulic mounting hole 122 of the rear housing 121. The rear hydraulic cylinder 123 can drive the rear hydraulic push rod 124 to extend and retract. The rear telescopic body assembly 12 is supported on the inner wall of the conveying pipe b by the rear hydraulic cylinder 123 and the rear hydraulic push rod 124.

[0044] like Figure 8 and Figure 9 As shown, the stepping method of the stepping cleaning machine a is as follows:

[0045] Before stepping forward, the telescopic body assembly 1 is supported on the inner wall of the conveying pipe b by a front hydraulic support device and a rear hydraulic support device. First, the front hydraulic cylinder 113 of the front telescopic body assembly 11 drives the front hydraulic push rod 114 to retract, so that the front hydraulic support device is disengaged from the inner wall of the conveying pipe b. The forward hydraulic cylinder 127 drives the forward hydraulic push rod 128 on it to extend, so that the front telescopic body assembly 11 moves downward. When the forward hydraulic push rod 128 extends to its maximum stroke, the front hydraulic cylinder 113 of the front telescopic body assembly 11 drives the front hydraulic push rod 114 to extend, so that the front hydraulic support device is disengaged from the inner wall of the conveying pipe b. The hydraulic support device is supported on the inner wall of the conveying pipe b; then the rear hydraulic cylinder 123 of the rear telescopic body assembly 12 drives the rear hydraulic push rod 124 to retract, so that the rear hydraulic support device is disengaged from the inner wall of the conveying pipe b. The forward hydraulic cylinder 127 drives the forward hydraulic push rod 128 on it to retract, so that the rear telescopic body assembly 12 moves downward. When the forward hydraulic push rod 128 retracts to its minimum stroke, the rear hydraulic cylinder 123 of the rear telescopic body assembly 12 drives the rear hydraulic push rod 124 to extend, so that the rear hydraulic support device is supported on the inner wall of the conveying pipe b, and so on.

[0046] The beneficial technical effects of this embodiment are as follows:

[0047] (1) The rotatable telescopic scraper assembly can perform the first cleaning of concrete residue in the conveying pipeline, and the telescopic shovel can perform the second cleaning of the conveying pipeline.

[0048] (2) The hydraulic support device and the forward hydraulic cylinder can increase the reaction force of the stepping cleaning machine, which can clean large areas of high-viscosity and clogged concrete.

[0049] (3) Compared with the traditional method of water washing and air washing, it can save water resources and reduce the harm of high-pressure gas to construction personnel, and is safer and more reliable;

[0050] (4) The telescopic body assembly and telescopic scraper assembly can be extended and retracted by the hydraulic cylinder, and the combined telescopic shovel can be adapted to clean conveying pipes of different diameters.

[0051] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A step-type cleaning machine for variable-size pumped concrete conveying pipelines, used for cleaning conveying pipelines, characterized in that: The step-type cleaning machine includes a telescopic body assembly, a telescopic shovel, and a telescopic scraper assembly. The telescopic body assembly consists of a front telescopic body assembly and a rear telescopic body assembly. The rear telescopic body assembly includes a rear body shell, a rear hydraulic cylinder, and a forward hydraulic cylinder. The rear body shell is composed of four rear body shell assemblies, each of which is equipped with one rear hydraulic cylinder. There are five forward hydraulic cylinders, four of which are respectively installed on the four rear body shell assemblies, and the other forward hydraulic cylinder is installed in the forward hydraulic mounting hole in the middle of the front side of the rear telescopic body assembly. The forward hydraulic push rod of the forward hydraulic cylinder is connected to the front telescopic body assembly. The front telescopic body assembly is equipped with a front hydraulic cylinder. The telescopic shovel is installed at the front end of the front telescopic body assembly. The telescopic scraper assembly is located in front of the front telescopic body assembly, and the front telescopic body assembly drives the telescopic scraper assembly to rotate. The front telescopic body assembly includes a front body shell and a rotary motor. The front body shell is composed of four front body shell assemblies, and each front body shell assembly is equipped with a front hydraulic cylinder. The rotary motor is installed in the motor mounting hole in the middle of the front telescopic body assembly. A support hydraulic cylinder is fixed on the rotary motor. The support hydraulic cylinder push rod of the support hydraulic cylinder is connected to the front body shell assembly. The rotary motor shaft passes through the rotary shaft hole of the telescopic shovel and is connected to the telescopic scraper assembly. The telescopic scraper assembly includes a scraper, blades, and a scraper support hydraulic cylinder. The number of scrapers, blades, and scraper support hydraulic cylinders is the same. The scraper is located outside the blades. The base of the scraper support hydraulic cylinder is fixed on the rotary motor shaft, and the top rod of the scraper support hydraulic cylinder is connected to the scraper.

2. The step-type cleaning machine for variable-size pumped concrete conveying pipelines as described in claim 1, characterized in that: The telescopic shovel includes a main shovel, an auxiliary shovel, and a main shovel baffle. There are four main shovels and four auxiliary shovels. Each main shovel is connected to a corresponding front body shell assembly. The auxiliary shovels are installed in the auxiliary shovel mounting holes of the main shovels. A main shovel baffle is provided at the front of the four main shovels. The main shovel baffle has a rotating shaft hole.

3. The step-type cleaning machine for variable-size pumped concrete conveying pipelines as described in claim 1, characterized in that: The forward hydraulic cylinder located in the forward hydraulic mounting hole is mounted on the forward hydraulic base, and a support hydraulic cylinder is fixed on the forward hydraulic base. The support hydraulic cylinder push rod of the support hydraulic cylinder is connected to the rear body shell assembly.

4. The step-type cleaning machine for variable-size pumped concrete conveying pipelines as described in claim 1, characterized in that: The rear telescopic body assembly is supported on the inner wall of the conveying pipe by the rear hydraulic push rod of the rear hydraulic cylinder, and the front telescopic body assembly is supported on the inner wall of the conveying pipe by the front hydraulic push rod of the front hydraulic cylinder.

5. A step-type cleaning machine for variable-size pumped concrete conveying pipelines as described in claim 1, characterized in that: The rear hydraulic cylinder is installed in the rear hydraulic mounting hole of the rear telescopic body assembly, and the front hydraulic cylinder is installed in the front hydraulic mounting hole of the front telescopic body assembly.

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