A tight coupling type car coupler performance continuous coupling test device

Abstract

The present application relates to the technical field of motor vehicle maintenance, in particular to a close-coupled coupler performance continuous coupling test device. It comprises a base, a fixed tower arranged at one end of the base and a moving tower arranged at the other end of the base, the fixed tower and the moving tower are both used for installing couplers, the moving tower is connected with the oil cylinder in the base, and further comprises a rebound driving element and a locking mechanism; the rebound driving element is arranged between the movable end of the oil cylinder and the side wall of the moving tower, so that they are in an elastic connection state. The rebound driving element is arranged between the oil cylinder and the moving tower, so that they are in an elastic connection. The spring is compressed and stored energy by reversely driving the moving tower before the continuous coupling test, and the rebound driving element is released after the two couplers are coupled, so that the rebound driving element rebounds quickly to exert instantaneous tension on the couplers, thereby increasing the test items of the continuous coupling test device and improving the accuracy of comprehensive and accurate evaluation of the coupler performance.

Description

Technical Field

[0001] This invention relates to the field of high-speed train maintenance technology, and more specifically, to a close-coupled coupler performance testing device. Background Technology

[0002] After a certain mileage or time of operation, high-speed trains must undergo professional maintenance at prescribed intervals to ensure the reliable function of all components and safe operation. This maintenance work is carried out by qualified high-speed train maintenance companies. The standard maintenance procedure includes: first, separating and disassembling the components to be inspected from the bottom of the train body and transporting them to a dedicated maintenance workshop; then, a series of processes are carried out sequentially, including disassembly, flaw detection, repair, component replacement, reassembly, and performance testing.

[0003] The close-fitting coupler is a core component in the formation of high-speed trains, responsible for traction, braking force transmission, locking, and air / electrical circuit connection. Its performance directly affects driving safety, making performance testing crucial during maintenance. The coupling test bench is a core testing device that simulates actual coupling conditions to test indicators such as coupling reliability and locking stability, determining whether it meets reuse standards.

[0004] However, the commonly used coupling test benches currently have significant technical shortcomings. Their coupler drives mainly use hydraulic cylinders, which control the extension and retraction of piston rods through hydraulic fluid to drive the coupler's movement. However, due to the limitations of hydraulic transmission characteristics, the cylinder extension and retraction speed is slow, and rapid extension cannot be achieved.

[0005] In actual operation of high-speed trains, the couplers often bear instantaneous loads, such as the instantaneous longitudinal tension during rapid acceleration, which is crucial to the coupler performance. Existing test benches, due to the slow speed of the hydraulic cylinders, cannot simulate this instantaneous working condition, resulting in deviations between the test and actual working conditions, making it difficult to comprehensively and accurately evaluate the coupler performance. Summary of the Invention

[0006] The purpose of this invention is to provide a close-fitting coupler performance coupling test device, which solves the problem mentioned in the background art, namely, the difficulty in simulating instantaneous working conditions due to the slow speed of the hydraulic cylinder, by setting the connection between the hydraulic cylinder and the moving tower as an elastic connection and using the rapid rebound of the elastic connection to apply instantaneous tension to the coupler.

[0007] To achieve the above objectives, the close-fitting coupler performance coupling test device includes a base, a fixed tower disposed at one end of the base, and a movable tower slidably disposed at the other end of the base. Both the fixed tower and the movable tower are used to install the coupler. The movable tower is connected to a hydraulic cylinder inside the base. The device also includes a springback drive element and a locking mechanism. The rebound drive element is disposed between the movable end of the hydraulic cylinder and the side wall of the moving tower, so that the two are in an elastic connection state. One side of the base is provided with a limiting surface to prevent the movement of the mobile tower; the movement of the mobile tower is restricted by the limiting surface, so that the hydraulic cylinder squeezes and rebounds the drive element to compress and store energy. The locking mechanism is used to restrict the springback drive element to a compressed state and disengage from the springback drive element after the coupler is engaged, causing the springback drive element to spring back and apply instantaneous tension to the coupler.

[0008] Based on this, the locking mechanism includes a locking component, which includes a mounting plate, a limiting arm, and a locking rod; The mounting plate is fixedly disposed between the movable end of the spring and the hydraulic cylinder; The limiting arms are fixed to the side wall of the mobile tower and distributed on the outer periphery of the mounting plate; The locking rod slides vertically through the limiting arm and is connected to it by a connecting spring. The bottom end of the locking rod near the oil cylinder is an arc surface. It also includes an unlocking component for driving the locking lever to move. The unlocking component includes a dial that is rotatably sleeved on the outer ring of the cylinder and a first motor for driving the dial to rotate; The outer ring of the dial is provided with a protrusion for driving the locking lever away from the mounting plate.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this close-coupled coupler performance testing device, a rebound drive element is installed between the hydraulic cylinder and the moving tower, making the connection between them elastic. Before the coupling test, the moving tower is driven in the reverse direction to compress and store energy in the rebound drive element. When the two couplers are coupled, the compressed rebound drive element is released, causing it to quickly rebound and apply instantaneous tension to the couplers. This increases the number of test items in the coupling test device and improves the accuracy of comprehensively evaluating coupler performance.

[0010] 2. In this close-coupled coupler performance coupling test device, the spring can not only apply instantaneous tension to the coupler through rapid rebound, but also support the displacement of the moving tower within the allowable range of its own radial bending deformation. The moving tower is guided by the guiding mechanism to cause the position between the two couplers to shift. This shift is used to simulate the coupling performance of the EMU in an unaligned state, increasing the test scenarios of the device. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the spring structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4This is a schematic diagram of the structure of the dial of the present invention; Figure 5 This is a schematic diagram of the limiting arm of the present invention; Figure 6 This is a schematic diagram of the working state of the spring of the present invention; Figure 7 This is a schematic diagram of the structure of the rubber pad of the present invention; Figure 8 This is a schematic diagram of the structure of the guide block of the present invention; Figure 9 This is a schematic diagram showing the position of the guide block in this invention; Figure 10 This is a schematic diagram of the guide rod of the present invention. Figure 1 ; Figure 11 This is a schematic diagram of the guide rod of the present invention. Figure 2 ; Figure 12 This is a schematic diagram of the working state of the guide rod of the present invention.

[0012] The meanings of the labels in the diagram are as follows: 100. Base; 101. Fixed tower; 102. Moving tower; 103. Hydraulic cylinder; 104. Guide rail; 105. Slider; 106. Rubber pad; 110. Spring; 111. Mounting plate; 112. Limiting arm; 120. Locking mechanism; 121. Locking rod; 122. Arc surface; 123. Connecting spring; 130. Actuating disc; 131. First motor; 140. Guide block; 141. Guide surface; 150. Guide rod; 151. Disc; 152. Second motor; 200. Coupler. Detailed Implementation

[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0016] Each carriage of the train is connected by a coupler 200. After long-term use, the couplers 200 require periodic maintenance. After maintenance, the couplers 200 must undergo a coupling test on the coupling test device. Figure 1 As shown, the coupling test device includes a base 100, which is a frame structure with a closed bottom. Inside the base 100 are a fixed tower 101 and a movable tower 102. The fixed tower 101 is fixedly mounted at one end of the base 100, and the movable tower 102 is slidably mounted at the other end of the base 100 via a sliding mechanism. The movable tower 102 is connected to a hydraulic cylinder 103 inside the base 100. Driven by the hydraulic cylinder 103, the movable tower 102 can move closer to or further away from the fixed tower 101. When a coupling test is required, two couplers 200 are respectively mounted on the fixed tower 101 and the movable tower 102. The hydraulic cylinder 103 drives the movable tower 102 to move towards the fixed tower 101, thus coupling the two couplers 200.

[0017] After the two couplers 200 are coupled, the hydraulic cylinder 103 drives the movable tower 102 to move away from the fixed tower 101, thereby applying a separating tension force to the two couplers 200. This tension force reflects the coupling performance of the couplers 200. Since the extension speed of the hydraulic cylinder 103 is relatively slow, it is difficult to simulate the state of the couplers 200 being rapidly subjected to tension in a short period of time. Therefore, this invention provides a spring-loaded drive element and a locking mechanism 120 between the hydraulic cylinder 103 and the movable tower 102. The spring-loaded drive element is located between the movable end of the hydraulic cylinder 103 and the side wall of the movable tower 102, changing the original rigid connection to an elastic connection. Next, to enable the spring-loaded drive element to spring back and pull the couplers 200, this invention sets the base 100 as a frame structure with a closed bottom. In other words, a downward recess is provided at the top of the base 100, and the movable tower 102 is located within the recess. This prevents the movable tower 102 from detaching from the base 100. Simultaneously, when the movable tower 102 is in... Figure 1When the base 100 is in the middle state, the inner side of the right end forms a limiting surface to block the movement of the moving tower 102. At this time, the hydraulic cylinder 103 pushes the moving tower 102 to move towards the limiting surface. Through the blocking effect of the limiting surface, the hydraulic cylinder 103 compresses and stores energy in the rebound drive element. After energy storage, the locking mechanism 120 restricts the rebound drive element to the compressed state. When the coupler 200 is coupled, the locking mechanism 120 disengages from the rebound drive element, causing the rebound drive element to rebound and apply an instantaneous pulling force to the coupler 200.

[0018] exist Figure 2 In the illustrated embodiment, the rebound drive element is a spring 110. The number and specifications of the springs 110 are adaptively adjusted according to the performance of the coupler 200, meaning that the tension applied by the spring 110 to the coupler 200 after rebound must meet the test standards. One end of the spring 110 is fixedly connected to the movable end of the hydraulic cylinder 103, and the other end is fixedly connected to the side wall of the moving tower 102, specifically by means of snap-fit, welding, etc. Thus, when the moving tower 102 is pressed against the limiting surface and cannot move, the hydraulic cylinder 103 compresses the spring 110 to store energy, and the deformed base 100 is in a position... Figure 2 The lower half of the state is then controlled by the locking mechanism 120 to allow the spring 110 to rebound after the coupler 200 is engaged.

[0019] The locking mechanism 120 includes a locking element and an unlocking element. The locking element is used to restrict the spring 110 to a compressed state, and the unlocking element is used to release the locking element from restricting the spring 110, causing the locking element to spring back and apply a pulling force to the coupler 200. The specific structure is as follows: Locking components: mainly composed of mounting plate 111, limit arm 112, and locking rod 121. For example... Figure 2 As shown, the mounting plate 111 is fixedly disposed between the spring 110 and the movable end of the hydraulic cylinder 103, that is, the movable end of the hydraulic cylinder 103 is fixedly connected to the mounting plate 111, and the mounting plate 111 is fixedly connected to one end of the spring 110. Limiting arms 112 are fixed to the side wall of the moving tower 102 and distributed around the outer periphery of the mounting plate 111. Taking a rectangular mounting plate 111 as an example, the limiting arms 112 are distributed on the four side walls of the mounting plate 111, and the side wall of each limiting arm 112 slides against the side wall of the mounting plate 111. This design, on the one hand, restricts the mounting plate 111 through multiple limiting arms 112 to prevent the spring 110 from overturning during compression; on the other hand, it also provides an installation environment for the locking rod 121. When spring 110 is compressed, locking lever 121 maintains the compressed state of spring 110 by locking mounting plate 111. Therefore, after spring 110 is compressed, the position of locking lever 121 should correspond to the position of mounting plate 111 (see reference). Figure 2 (The position of the locking lever 121 in the lower half), at this position, as... Figure 3As shown, the locking rod 121 slides vertically through the limiting arm 112 and is elastically connected to the limiting arm 112 by a connecting spring 123. At the same time, the bottom end of the locking rod 121 is tilted on the side near the oil cylinder 103, so that its bottom forms an arc surface 122.

[0020] In this way, when the hydraulic cylinder 103 compresses the spring 110 to store energy, the mounting plate 111 moves towards the locking rod 121. When the mounting plate 111 contacts the arc surface 122 at the bottom of the locking rod 121, the mounting plate 111, through the arc surface 122, compresses the locking rod 121 upwards, causing the mounting plate 111 to pass over the locking rod 121. Subsequently, the locking rod 121 returns to its original position downwards via the connecting spring 123. At this time, the elasticity of the spring 110 pushes the mounting plate 111 against the side of the locking rod 121 opposite to the arc surface 122. Since this side is parallel to the side wall of the mounting plate 111, the mounting plate 111 is locked by the locking rod 121, thereby restricting the spring 110 to a compressed state. (See the specific details for reference.) Figure 2 The lower half of it.

[0021] In this invention, such as Figure 5 As shown, the length of the limiting arm 112 is greater than the length of the spring 110 in its free state (unforced, uncompressed / unstretched). This ensures that the mounting plate 111, regardless of its state (free or compressed), will always be positioned between multiple limiting arms 112, thus preventing the spring 110 from overturning during compression. Alternatively, the length of the limiting arm 112 can be set to be less than the length of the spring 110 in its free state, i.e., 0.5cm-3cm shorter than the spring 110 in its free state (too large a length would easily cause the spring 110 to overturn). This solution is for reference only. Figure 2 When the spring 110 is not compressed, the mounting plate 111 and the limiting arm 112 do not come into contact. When the fixed tower 101 squeezes the mounting plate 111 to move a certain distance, the mounting plate 111 will enter between the multiple limiting arms 112. At this time, the limiting arm 112 is used to prevent the spring 110 from flipping.

[0022] Unlocking components: such as Figure 4 As shown, the unlocking mechanism mainly includes a dial 130 rotatably mounted on the outer ring of the hydraulic cylinder 103 and a first motor 131 for driving the dial 130 to rotate. The outer ring of the dial 130 protrudes outwards to form protrusions, the number of which corresponds to the number of locking rods 121. During the unlocking process, the first motor 131 drives the dial 130 to rotate. At this time, the dial 130, which is attached to the side wall of the mounting plate 111, rotates, and during this rotation, the protrusions push the locking rods 121 away from the mounting plate 111. When the locking rods 121 disengage from the mounting plate 111, the spring 110 instantly rebounds and applies a thrust to the hydraulic cylinder 103 and the moving tower 102.

[0023] In a specific implementation, a motor bracket is set on the outer ring of the oil cylinder 103 for the installation of the first motor 131, and a gear set is used for transmission between the output end of the first motor 131 and the side wall of the dial 130. The gear set can amplify the torque of the first motor 131 so that the smaller first motor 131 can stably drive the dial 130 to rotate.

[0024] Alternatively, the unlocking component can be a cylinder connected to the locking rod 121, which directly controls the movement of the locking rod 121, thereby controlling the mounting plate 111.

[0025] The specific principle of the suspension test device will be explained in detail below: like Figure 6 As shown, after the coupler 200 is installed, the control cylinder 103 drives the moving tower 102 to move to the right, causing the locking mechanism 120 to abut against the limiting surface of the base 100. Under the obstruction of the limiting surface, the locking mechanism 120 cannot move, and the spring 110 begins to compress and store energy. During the compression and energy storage process, the mounting plate 111 continues to move and passes over the locking rod 121. Subsequently, the control cylinder 103 drives the moving tower 102 to move to the left. At this time, the cylinder 103 pulls the moving tower 102 to move through the mounting plate 111, the locking rod 121, and the limiting arm 112, so that the moving tower 102 drives the coupler 200 to be coupled to another coupler 200.

[0026] After the two couplers 200 are coupled, the drive dial 130 rotates to disengage the locking rod 121 from the mounting plate 111. At this point, the spring 110 rebounds momentarily and applies a thrust to the cylinder 103 and the moving tower 102. However, since the cylinder 103 is filled with oil, the moving end will not retract. Therefore, the rebound force of the spring 110 is almost entirely applied to the moving tower 102, causing the moving tower 102 to quickly pull the coupler 200 to move, thereby applying a momentary pulling force to the coupler 200.

[0027] Furthermore, simulating train coupling typically includes an abnormal coupling test. This test simulates whether the coupler 200 can still automatically couple smoothly even when it experiences vertical or horizontal misalignment. Therefore, this invention, based on the above, employs... Figure 2 The illustrated embodiment (i.e., the limiting arm 112 is shorter than the spring 110 in its free state) achieves an abnormal coupling test. Specifically, based on the elastic connection between the hydraulic cylinder 103 and the moving tower 102, a guiding mechanism is set to guide the displacement of the moving tower 102. The displacement of the moving tower 102 forces an offset between the two couplers 200 to simulate an abnormal coupling test. Details are as follows: exist Figures 7-9In the illustrated embodiment, the guiding mechanism includes a rubber pad 106 disposed between the moving tower 102 and the sliding mechanism, and a guide block 140 located on the moving path of the moving tower 102. In this invention, the sliding mechanism employs a common guide rail 104 and a slider 105. The guide rail 104 is fixed inside the bottom of the base 100, while the slider 105 slides on the top of the guide rail 104. In this embodiment, the rubber pad 106 is fixedly disposed between the top of the slider 105 and the bottom of the moving tower 102, so that the displacement of the moving tower 102 is achieved through the deformation of the rubber pad 106. The guide block 140 is located at the bottom and / or side of the moving path of the locking mechanism 120. When the two couplers 200 are about to be coupled, the locking mechanism 120 moves to the guide surface 141 of the guide block 140. At this time, the locking mechanism 120 is guided by the guide surface 141. Under this guidance, the rubber pad 106 is forced to deform, and the spring 110 bends radially, thereby causing the moving tower 102 to displace. The displacement of the locking mechanism 120 also causes the couplers 200 to displace, thus causing the two couplers 200 to shift apart. When the moving tower 102 is in the plane of the guide block 140, the two couplers 200 are coupled.

[0028] It should be understood that, without departing from the scope of innovation of this invention, the sliding mechanism may also be a round rod that runs through the moving tower 102, the round rod guiding the moving tower 102 to move, while the rubber pad 106 is slidably sleeved on the outer ring of the round rod to change the position of the moving tower 102 through deformation.

[0029] exist Figures 10-12 In the illustrated embodiment, the guiding mechanism includes a guide rod 150 that slides through the moving tower 102. The length direction of the guide rod 150 is consistent with the coupling direction of the coupler 200, and the guide rod 150 is distributed at both ends of the moving tower 102 to maintain the balance of the moving tower 102. The two ends of the guide rod 150 are fixedly and eccentrically disposed on the side wall of the disc 151, which is rotatably disposed within the base 100, and one of the discs 151 is connected to a second motor 152 within the base 100.

[0030] In this embodiment, when the tower 102 needs to be moved, the second motor 152 drives the guide rod 150 to rotate via the disk 151. Since the guide rod 150 is eccentrically positioned, it will rotate to... Figure 12 In the dotted line state, the corresponding moving tower 102 will also be driven to the dotted line state by the guide rod 150. Since the hydraulic cylinder 103 and the moving tower 102 are connected by a spring 110, the spring 110 will bend radially to support the displacement of the moving tower 102.

[0031] It should be noted that the displacement of the moving tower 102 should be kept within the allowable range of radial bending deformation of the spring 110. If it exceeds this range, a separate drive mechanism is required to drive the fixed tower 101 to generate displacement.

[0032] In summary, the spring 110 can not only apply instantaneous tension to the coupler 200 through rapid rebound, but also support the displacement of the moving tower 102 within the allowable range of its own radial bending deformation. The moving tower 102 is guided to move through the guiding mechanism, causing the position between the two couplers 200 to shift. This shift is used to simulate the coupling performance of the train in an unaligned state, increasing the test scenarios of the device.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A close-fitting coupler performance coupling test device, comprising a base (100), a fixed tower (101) disposed at one end of the base (100), and a movable tower (102) slidably disposed at the other end of the base (100), wherein the fixed tower (101) and the movable tower (102) are both used to install couplers (200), and the movable tower (102) is connected to a hydraulic cylinder (103) inside the base (100), characterized in that: It also includes a spring-back drive element and a locking mechanism (120); The rebound drive element is disposed between the movable end of the hydraulic cylinder (103) and the side wall of the moving tower (102), so that the two are in an elastic connection state; The base (100) has a limiting surface on one side to block the movement of the mobile tower (102); the mobile tower (102) is restricted from moving by the limiting surface, so that the oil cylinder (103) squeezes the springback drive element to compress and store energy. The locking mechanism (120) is used to restrict the springback drive element to a compressed state and disengage from the springback drive element after the coupler (200) is engaged, so that the springback drive element rebounds and applies instantaneous tension to the coupler (200).

2. The close-coupled coupler performance coupling test device according to claim 1, characterized in that: The base (100) has a recess at its top, and the mobile tower (102) is slidably disposed in the recess. The inner wall of the base (100) is a limiting surface on the side of the mobile tower (102) away from the fixed tower (101).

3. The close-coupled coupler performance coupling test device according to claim 1, characterized in that: The rebound drive element is a spring (110).

4. The close-coupled coupler performance coupling test device according to claim 3, characterized in that: The locking mechanism (120) includes a locking element, which includes a mounting plate (111), a limiting arm (112), and a locking rod (121). The mounting plate (111) is fixedly disposed between the spring (110) and the movable end of the oil cylinder (103); The limiting arm (112) is fixed to the side wall of the mobile tower (102) and distributed on the outer periphery of the mounting plate (111); The locking rod (121) slides vertically through the limiting arm (112) and is connected to it by a connecting spring (123). The bottom end of the locking rod (121) near the oil cylinder (103) is an arc surface (122). It also includes an unlocking component for displacing the locking lever (121).

5. The close-coupled coupler performance coupling test device according to claim 4, characterized in that: The length of the limiting arm (112) is greater than the length of the spring (110) in its free state.

6. The close-coupled coupler performance coupling test device according to claim 4, characterized in that: The length of the limiting arm (112) is less than the length of the spring (110) in the free state, so that the spring (110) can produce radial bending deformation when uncompressed.

7. The close-coupled coupler performance coupling test device according to claim 4, characterized in that: The unlocking component includes a dial (130) rotatably sleeved on the outer ring of the cylinder (103) and a first motor (131) for driving the dial (130) to rotate. The outer ring of the dial (130) is provided with a protrusion for driving the locking lever (121) away from the mounting plate (111).

8. The close-coupled coupler performance coupling test device according to claim 6, characterized in that: It also includes a guiding mechanism that drives the displacement of the moving tower (102) by the radial bending deformation of the spring (110), so that the two couplers (200) are coupled in an offset state.

9. The close-coupled coupler performance coupling test device according to claim 8, characterized in that: The guiding mechanism includes a rubber pad (106) disposed between the moving tower (102) and the sliding mechanism, and a guide block (140) located on the moving path of the moving tower (102). The guide block (140) is located at the bottom and / or side of the moving path of the locking mechanism (120). The end of the guide block (140) is provided with a guide surface (141), which forces the rubber pad (106) to deform, thereby driving the moving tower (102) to move.

10. The close-coupled coupler performance coupling test device according to claim 8, characterized in that: The guiding mechanism includes a guide rod (150) that slides through the mobile tower (102). The guide rod (150) is rotatably disposed in the base (100). The guide rod (150) is eccentrically connected to a second motor (152) in the base (100). The eccentric rotation of the guide rod (150) drives the mobile tower (102) to move.

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