Spiral oscillating cylinder applied to deep sea

Abstract

The invention discloses a spiral oscillating cylinder applied to deep sea, and belongs to the technical field of hydraulic cylinders. The spiral oscillating cylinder comprises an encoder driving lever, a transmission shaft, an encoder mounting seat, an encoder, a bearing, a piston rod, a cylinder body, a piston, a guide sleeve, an expansion coupling sleeve and a watertight joint; after the piston rod, the piston and the guide sleeve are sleeved with the sealing pieces, the piston rod is arranged in the cylinder body and then matched with the piston and the guide sleeve, and the piston rod, the guide sleeve and the cylinder body are connected together through the expansion coupling sleeve. A bearing is arranged between the axial matching surfaces of the piston rod, the guide sleeve and the cylinder body; the encoder mounting seat is located in a left-end inner hole of the piston rod, the encoder sealing end cover penetrates through the transmission shaft to be installed on the end face of the left-end inner hole of the piston rod, two ends of the encoder driving lever are connected with the driving block on the cylinder body and the transmission shaft respectively, and a cable of the encoder is led out to be connected with a cable in a watertight connector in a right-end inner hole of the piston rod. The problems of application of the spiral oscillating cylinder in the deep sea environment, thread fatigue engagement, sealing element torsion and the like can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a spiral swing cylinder used in the deep sea. Background Art

[0002] Conventional double-helix swing cylinders are not designed with seals for deep-sea applications, and a threaded structure is used to connect the piston rod and the guide sleeve. This structure has the following problems: 1. There is no sealing design that can withstand external pressure, and it cannot be used in deep-sea environments; 2. The coaxiality requirements of the piston rod thread, the guide sleeve thread and the inner hole of the cylinder body are high, otherwise it is easy to "hold back the strength", increase the leakage of the cylinder and may damage the piston rod, which invisibly increases the processing accuracy and difficulty of the parts; 3. The O-ring on the guide sleeve, which acts as a static seal, will also enter in a spiral extrusion shape when the guide sleeve is screwed in, so the seal may be damaged due to torsion, deformation and other problems. 4. Torque is transmitted between the piston rod and the guide sleeve through the thread, and there is a risk of fatigue bite of the thread under long-term repeated impact of large torque. Summary of the invention

[0003] In view of this, the present invention provides a spiral swing cylinder for deep sea application, which can solve the problems of deep sea environment application of spiral swing cylinder, thread fatigue bite and seal torsion, etc., reduces the difficulty of processing and assembly of hydraulic cylinder, improves production efficiency, and further expands the scope of use of double spiral swing cylinder with expansion sleeve structure.

[0004] A spiral swing cylinder used in deep sea, comprising an encoder lever, a transmission shaft, an encoder mounting seat, an encoder, a bearing, a piston rod, a cylinder body, a piston, a guide sleeve, an expansion sleeve and a watertight joint;

[0005] The piston rod has a hollow inner hole for installing an encoder, a transmission shaft and a watertight joint;

[0006] After the piston rod, piston and guide sleeve are sealed, the piston rod is installed in the cylinder body and matched with the piston and guide sleeve, and the piston rod, guide sleeve and cylinder body are connected together through the expansion sleeve; a bearing is installed between the axial matching surfaces of the piston rod, guide sleeve and cylinder body;

[0007] The encoder mounting seat is located in the inner hole at the left end of the piston rod, the encoder sealing end cover passes through the transmission shaft and is installed on the end surface of the inner hole at the left end of the piston rod, the two ends of the encoder shift rod are respectively connected to the shift block and the transmission shaft on the cylinder body, and the encoder cable is connected to the cable in the watertight joint in the inner hole at the right end of the piston rod.

[0008] Furthermore, an expansion sleeve sealing cover is installed outside the expansion sleeve.

[0009] Furthermore, three continuous right-angle step holes are processed on the end face of one side of the guide sleeve. After the guide sleeve is inserted into the cylinder body and cooperates with the piston rod, an installation cavity for the expansion sleeve and the expansion sleeve sealing cover is formed. The first-level and second-level right-angle step holes are used to install the expansion sleeve, and the rear half of the second-level right-angle step hole and the third-level right-angle step hole are used to install the expansion sleeve sealing cover.

[0010] Furthermore, when the cylinder body rotates, it drives the encoder lever to rotate the transmission shaft relative to the encoder, so that the encoder obtains a rotation angle signal, and then outputs a signal from the watertight joint at the tail of the piston rod through a cable connected to the encoder. The central processing unit then performs logical operations based on the collected values, obtains the angle value in real time, and adjusts the rotation angle through the output flow.

[0011] Furthermore, a rotating seal is arranged between the transmission shaft and the encoder sealing end cover, an O-ring is arranged between the encoder sealing end cover and the piston rod for sealing, and O-rings are arranged between the end face and the radial direction of the watertight joint and the piston rod for sealing, thereby ensuring that the encoder sealing structure can meet the requirements of deep-sea applications, and at the same time, the watertight joint also plays a role in preventing the expansion coupling sleeve from loosening.

[0012] Beneficial effects:

[0013] 1. The present invention simplifies assembly. The guide sleeve can be directly pressed in without rotation, so that there is no screwing action during the installation of the seal. Therefore, the seal will not be twisted and deformed to produce resistance, and no pre-tightening is required, making the installation simple. In addition, when the double-helix swing cylinder outputs axial force and torque, its maximum value does not exceed 50% of the rated value of the selected expansion sleeve, thereby effectively ensuring that the expansion sleeve slips due to overload, improving the reliability of the connection, and further improving the operating condition of the double-helix swing cylinder, and extending the maintenance cycle and service life of the double-helix swing cylinder.

[0014] 2. The present invention designs the piston rod into a hollow structure, and installs an angle sensor, a transmission shaft and a watertight joint inside. The built-in angle sensor is used to collect angle signals, so that the rotation angle of the swing cylinder can be accurately controlled.

[0015] 3. The present invention has good adaptability to deep-sea environment and has the characteristics of high control accuracy, low processing difficulty, little damage to seals, good centering, convenient assembly, short processing cycle, high production efficiency and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a spiral swing cylinder used in the deep sea according to the present invention;

[0017] Among them, 1-encoder lever, 2-transmission shaft, 3-encoder sealing end cover, 4-encoder mounting seat, 5-encoder, 6-bearing, 7-piston rod, 8-cylinder body, 9-piston, 10-guide sleeve, 11-expansion sleeve, 12-expansion sleeve sealing cover, 13-watertight joint. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0019] The present invention provides a spiral swing cylinder for deep sea use, which is composed of an encoder lever 1, a transmission shaft 2, an encoder sealing end cover 3, an encoder mounting seat 4, an encoder 5, a bearing 6, a piston rod 7, a cylinder body 8, a piston 9, a guide sleeve 10, an expansion sleeve 11, an expansion sleeve sealing cover 12, a watertight joint 13 and a sealing member.

[0020] Among them, the piston rod 7 has a hollow inner hole for installing the encoder 5, the transmission shaft 2 and the watertight joint 13. In addition, three continuous right-angle step holes are processed on the end face of one side of the guide sleeve 10. After the guide sleeve 10 is installed in the cylinder body 8 and cooperates with the piston rod 7, a mounting cavity for the expansion sleeve 11 and the expansion sleeve sealing cover 12 is formed. The first-level and second-level right-angle step holes are used to install the expansion sleeve 11, and the rear half of the second-level right-angle step hole and the third-level right-angle step hole are used to install the expansion sleeve sealing cover 12.

[0021] After hydraulic oil is input into the two chambers of the spiral swing cylinder respectively, the guide sleeve 10 and the piston rod 7 can synchronously swing the double-headed output rotation angle and rotation torque relative to the cylinder body 8; the guide sleeve 10 and the piston rod 7 can also be fixed to allow the cylinder body 8 to swing to output the rotation angle and rotation torque.

[0022] The assembly process of the spiral swing cylinder: first, install the piston rod 7, piston 9, and guide sleeve 10 with seals to complete the assembly, and then install the bearing 6 on the piston rod 7 and the guide sleeve 10 respectively. Then, install the piston rod 7 with the above parts into the cylinder body 8, and then install the piston 9, and then install the guide sleeve 10, and then use the expansion sleeve 11 to connect the piston rod 7 and the guide sleeve 10, and finally install the expansion sleeve sealing cover 12 to complete the assembly of the swing cylinder. Non-self-locking trapezoidal threads are used between the cylinder body 8 and the piston 9, and between the piston 9 and the piston rod 7 to transmit torque.

[0023] The assembly process of the rotation signal acquisition system is as follows: first, connect the transmission shaft 2, the encoder mounting seat 4, and the encoder 5 together to complete the assembly, then install the encoder mounting seat 4 into the inner hole at the left end of the piston rod 7, and then pass the encoder sealing end cover 3 through the transmission shaft 2 and install it on the end face of the inner hole at the left end of the piston rod 7, then pass the encoder lever 1 through the shift block on the cylinder 8 to connect with the transmission shaft 2, then lead out the cable of the encoder 5 and connect it with the cable in the watertight joint 13, and then put the excess cable into the inner hole of the piston rod 7, and finally install the seal on the watertight joint 13 and fix it to the right end face of the piston rod 7 with bolts. When the cylinder 8 rotates, the shift block drives the encoder lever 1 to rotate the transmission shaft 2 relative to the encoder 5, so that the encoder 5 obtains the rotation signal. Then, through the cable connected to the encoder 5, the signal is output from the watertight joint 13 at the end of the piston rod 7.

[0024] In the above installation process, since the piston rod 7 guide, the guide sleeve 10 and the cylinder body 8 are connected and tightened by the expansion coupling sleeve 11, the need for the guide sleeve and the threaded gland to rotate and cooperate when the threaded gland is tightened is avoided, and the assembly process is simplified. The guide sleeve can be directly pressed in without rotation, so that there is no screw-in action during the installation of the seal, so the seal will not be twisted and deformed to produce resistance, and no pre-tightening is required, making the installation easy. Secondly, because there is an encoder that can collect rotation signals, the rotation angle of the double-helix swing cylinder used in the deep sea can be accurately controlled. Thirdly, because there is a sealing structure for external seawater and internal hydraulic oil, the double-helix swing cylinder can meet the deep-sea application environment. Finally, because of the above effects, the present invention has good adaptability to the deep-sea environment and has the characteristics of high control accuracy, low processing difficulty, little damage to the seal, good centering, convenient assembly, short processing cycle, high production efficiency and long service life.

[0025] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spiral swing cylinder used in deep sea, characterized in that: It includes an encoder lever, a transmission shaft, an encoder mounting seat, an encoder, a bearing, a piston rod, a cylinder body, a piston, a guide sleeve, an expansion sleeve and a watertight joint; The piston rod has a hollow inner hole for installing an encoder, a transmission shaft and a watertight joint; The piston rod, piston and guide sleeve seal are installed. After the piston rod is installed in the cylinder body, it cooperates with the piston and the guide sleeve. The piston rod, the guide sleeve and the cylinder body are connected together through the expansion sleeve. A bearing is installed between the axial matching surfaces of the piston rod, the guide sleeve and the cylinder body. The encoder mounting seat is located in the inner hole at the left end of the piston rod, the encoder sealing end cover passes through the transmission shaft and is installed on the end surface of the inner hole at the left end of the piston rod, the two ends of the encoder shift rod are respectively connected to the shift block and the transmission shaft on the cylinder body, and the encoder cable is connected to the cable in the watertight joint in the inner hole at the right end of the piston rod.

2. A spiral swing cylinder for deep sea use as claimed in claim 1, characterized in that: An expansion sleeve sealing cover is additionally installed outside the expansion coupling sleeve.

3. A spiral swing cylinder for deep sea use as claimed in claim 2, characterized in that: Three continuous right-angle step holes are processed on the end face of one side of the guide sleeve. After the guide sleeve is inserted into the cylinder body and cooperates with the piston rod, an installation cavity for the expansion sleeve and the expansion sleeve sealing cover is formed. The first-level and second-level right-angle step holes are used to install the expansion sleeve, and the rear half of the second-level right-angle step hole and the third-level right-angle step hole are used to install the expansion sleeve sealing cover.

4. A spiral swing cylinder for deep sea use as claimed in claim 3, characterized in that: When the cylinder body rotates, it drives the encoder lever to rotate the transmission shaft relative to the encoder, so that the encoder obtains a rotation angle signal, and then outputs a signal from the watertight joint at the tail of the piston rod through a cable connected to the encoder. The central processing unit then performs logical operations based on the collected values, obtains the angle value in real time, and adjusts the rotation angle through the output flow.

5. A spiral swing cylinder for deep sea use as claimed in claim 3 or 4, characterized in that: A rotating seal is arranged between the transmission shaft and the encoder sealing end cover, an O-ring is arranged between the encoder sealing end cover and the piston rod for sealing; and O-rings are arranged between the end face and radial direction of the watertight joint and the piston rod for sealing.

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