A special vehicle for rapid inspection of charging piles

Abstract

The application relates to the field of charging pile detection, and discloses a special vehicle for quickly detecting a charging pile, which comprises a mobile vehicle, a rear door arranged at the tail of the mobile vehicle, a mobile base slidingly arranged in the mobile vehicle along the length direction of the vehicle, a traction assembly and a detection assembly arranged on the upper surface of the mobile base, a detection terminal arranged in the mobile vehicle, a socket matched with a charging gun arranged on the detection terminal, the traction assembly comprising a fixing base arranged on the upper surface of the mobile base, a sliding base slidingly arranged on the fixing base along the width direction of the vehicle, a stand column hingedly arranged on the sliding base, a connecting base slidingly arranged on the stand column along the extending direction of the stand column, an intermediate base hingedly arranged on the connecting base, a horizontal column slidingly arranged on the intermediate base along the length direction of the vehicle, and a driving piece arranged on the horizontal column and used for driving the horizontal column to move, the detection assembly being arranged on the side of the horizontal column away from the head of the mobile vehicle, and the horizontal column being kept horizontally arranged in the process of deflection of the stand column.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging pile detection, in particular to a special vehicle for rapid inspection of charging piles. BACKGROUND

[0002] With the rise of new energy vehicles, charging piles can be seen everywhere, for example, some parking spaces are provided with charging piles behind them.

[0003] In order to ensure the safety and reliability of the charging pile in use, it is necessary to regularly detect the heat dissipation performance, installation stability and overall appearance of the charging pile, for example: the Chinese invention patent with authorization announcement number CN118528831B discloses a charging pile heat dissipation mechanism with independent air duct, according to its disclosure, efficient heat dissipation of the charging pile is one of the important factors to ensure the safety of the charging pile, therefore, it is necessary to detect the heat dissipation performance of the charging pile; the Chinese invention patent application with application publication number CN119471156A discloses a charging pile reliability test device, which discloses detection of the charging pile under simulated collision environment, therefore, it is necessary to detect the installation stability of the charging pile.

[0004] Based on the above, it is necessary to regularly detect the charging pile, and due to the wide popularity of the charging pile, the traditional way of detecting the charging pile one by one by manpower is low in efficiency and high in detection intensity, based on this, the Chinese invention patent application with application publication number CN116985660A is found, which discloses a mobile device suitable for charging pile detection, which realizes folding to reduce space occupation when not in use, and automatically extends the maximum stroke of the detection assembly outward, keeps the outward turning and lifting parallel, and automatically expands and positions the detection terminal above the charging pile to improve the accuracy and efficiency of detection by connecting the base, stroke expansion mechanism, extension moving seat, parallel link mechanism, lifting base and linkage turning mechanism, but it needs to connect the base, stroke expansion mechanism, extension moving seat, parallel link mechanism, lifting base and linkage turning mechanism to achieve the above purpose, therefore, it has the problems of complex structure and tedious unfolding and folding actions, which will also cause the effect of reducing space occupation to be poor and the effect of improving detection efficiency and accuracy to be poor.

[0005] Based on the above problems, the present application provides a special vehicle for rapid inspection of charging piles. SUMMARY

[0006] To solve the problems mentioned in the above background, the present application provides a special vehicle for rapid inspection of charging piles.

[0007] To achieve the above technical purposes, the technical solutions adopted by the present application are as follows.

[0008] A kind of special vehicle for quick inspection of charging pile, including mobile car, rear door is provided at the tail of mobile car, mobile base is slidably arranged in mobile car along the length direction of car, the upper surface of mobile base is provided with traction assembly and detection assembly, detection terminal is provided in mobile car, detection terminal is provided with the socket matched with charging gun;

[0009] Traction assembly includes fixed seat provided on the upper surface of mobile base, sliding seat is slidably arranged on fixed seat along the width direction of car, sliding seat is hingedly arranged with stand, connecting seat is slidably arranged on stand along the extension direction of itself, intermediate seat is hingedly arranged on connecting seat, horizontal column is slidably arranged on intermediate seat along the length direction of car, horizontal column is provided with driving part for driving itself to move, detection assembly is arranged on the side of horizontal column away from the head of mobile car;

[0010] In the process of deflection of stand, horizontal column keeps horizontal arrangement.

[0011] As further improvement and optimization of the application, electric push rod for driving mobile base to move is arranged in mobile car, first linear module for driving sliding seat to move is arranged on fixed seat, second linear module for driving connecting seat to move is arranged on stand.

[0012] As further improvement and optimization of the application, the hinging shaft formed between sliding seat and stand is parallel to the width direction of car, the hinging shaft formed between connecting seat and intermediate seat is parallel to the width direction of car.

[0013] As further improvement and optimization of the application, first motor is arranged on sliding seat, power connection is formed between first motor and hinging shaft one through power connecting piece, power connection is realized between hinging shaft one and hinging shaft two through power transmission assembly, and the transmission ratio of power transmission assembly is one.

[0014] Hinging shaft one is fixedly arranged on sliding seat, stand is movably connected with hinging shaft one, hinging shaft two is fixedly arranged on intermediate seat, and hinging shaft two is movably connected with connecting seat.

[0015] As further improvement and optimization of the application, power transmission assembly includes connecting shaft arranged on stand, the axial line direction of connecting shaft is parallel to the extension direction of stand.

[0016] First bevel gear set is arranged between connecting shaft and hinging shaft one.

[0017] Second bevel gear set is arranged between connecting shaft and hinging shaft two, driving bevel gear of second bevel gear set is arranged on connecting shaft through spline, and when connecting seat moves with driving bevel gear, connecting shaft and driving bevel gear keep power connection.

[0018] As a further improvement and optimization of the present application, the power connection route of the power connection comprises a worm gear.

[0019] As a further improvement and optimization of the present application, the driving member comprises a threaded shaft arranged on the cross column, the axial line direction of the threaded shaft is parallel to the vehicle length direction, the threaded shaft is threadedly connected with the intermediate seat, and the input end of the threaded shaft is connected with a third motor.

[0020] As a further improvement and optimization of the present application, the detection assembly comprises a ring seat arranged on the cross column, a rotating ring and a second motor for driving the rotating ring to rotate are arranged on the ring seat, and the axial line of the rotating ring is vertically arranged.

[0021] The inner ring surface of the rotating ring is provided with a temperature detection element, a camera element and a probe, and the probe is arranged on the inner ring surface of the rotating ring through a pressure sensor.

[0022] Compared with the prior art, the present application has the beneficial effects that:

[0023] In the present scheme, the traditional mechanical hand and other multi-link technologies are abandoned, and an integrated simple structure is constructed through the column, the cross column and the bevel gear structure, which can achieve the following purposes: the structure is simpler, and the effect is better.

[0024] I. When not in use, the column is driven to change from vertical to horizontal, while the cross column remains horizontal, and is embedded in the column, as shown in Figure 4 As shown, the volume of the detection member can be maximized, and the occupied space can be reduced.

[0025] II. When detecting, the column can be changed from horizontal to vertical by the driving of the first motor, the cross column remains horizontal, the axial line of the detection assembly remains vertical, and the detection assembly is shifted from point A to point B, there is a spatial distance in the height direction and the vehicle length direction between point A and point B, therefore, based on the shortest distance between two points, the present scheme can simultaneously realize movement in the height direction and the vehicle length direction, and the detection assembly can be located above the charging pile in the shortest time, the detection efficiency is obviously improved, and it should be noted that the charging piles in the parking lot are distributed more, therefore, it is very necessary to improve the detection efficiency of each one.

[0026] Further, the axial line of the detection assembly always remains vertical, so that the accuracy of the detection result can be greatly improved during the subsequent charging pile stability detection, and specifically, if the axial line of the detection assembly is slightly offset, the pushing force applied to the charging pile is composed of the vertical component and the horizontal component, and the horizontal component is the actual pushing force applied to the charging pile, so that the problem of inaccurate detection result is prone to occur.

[0027] In addition, the mobile vehicle of the present application is a special vehicle, and the wheelbase is short, so even if the tail of the mobile vehicle is away from the charging pile, the head of the mobile vehicle is still in the parking space, and does not affect the driving of other vehicles in the parking lot. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure diagram of the present application Figure 1 ;

[0029] Figure 2 Structure diagram of the present application Figure 2 ;

[0030] Figure 3 Structure diagram of the present application Figure 3 ;

[0031] Figure 4 Structure diagram of the detection component Figure 1 ;

[0032] Figure 5 Structure diagram of the detection component Figure 2 ;

[0033] Figure 6 Schematic view of the traction assembly and the detection component

[0034] Figure 7 Structure diagram of the traction assembly

[0035] Figure 8 Partial schematic view of the traction assembly

[0036] Figure 9 Schematic view of the cross column and the detection component

[0037] Figure 10 Schematic view of the detection component

[0038] Reference signs in the drawings are:

[0039] 100, mobile vehicle; 101, mobile base; 200, detection component; 201, detection terminal; 202, traction assembly; 203, detection component; 2031, ring seat; 2032, second motor; 2033, rotating ring; 2034, temperature detection element; 2035, camera element; 2036, probe; 204, fixed seat; 205, first linear module; 206, sliding seat; 207, first motor; 208, power connecting piece; 209, vertical column; 210, second linear module; 211, connecting seat; 212, connecting shaft; 213, first bevel gear set; 214, second bevel gear set; 215, cross column; 216, driving piece; 217, intermediate seat. DETAILED DESCRIPTION

[0040] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined inventive purpose, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0041] Referring to Figures 1-10 A special vehicle for rapid inspection of charging piles, comprising a mobile vehicle 100, which adopts a technology similar to an existing van, and is provided with a rear door capable of being opened or closed at the tail thereof, and a mobile base 101 is slidingly arranged in the mobile vehicle 100 along the longitudinal direction thereof, and the upper surface of the mobile base 101 is provided with a detection component 200.

[0042] In use, an operator drives the mobile vehicle 100 to stop in a parking space, during which, through the cooperation of the reversing radar and the reversing camera arranged at the tail of the mobile vehicle 100, the operator can clearly know the distance of the mobile vehicle 100 from the charging pile behind, and when the distance reaches a set value, the parking is completed; it should be noted that the distance is a range value, which can be within a general range, and does not need to be highly accurate; the mobile vehicle 100 of the present scheme is a special vehicle, and the wheelbase thereof is relatively short, so even if there is a distance between the tail of the mobile vehicle 100 and the charging pile, the front of the mobile vehicle 100 is still located in the parking space, and will not affect the driving of other vehicles in the parking lot.

[0043] After parking, the rear door is opened, and the mobile base 101 is driven to move towards the charging pile through existing electric push rods and the like, and the mobile base 101 moves together with the detection component 200, so that the detection component 200 approaches the charging pile, and then the charging pile is detected through the detection component 200, and the detection process will be described in detail below.

[0044] Referring to Figures 4-10 The detection component 200 comprises a detection terminal 201, a traction assembly 202 and a detection assembly 203, wherein the traction assembly 202 is used to pull the detection assembly 203 to move to directly above the charging pile, and the detection assembly 203 is used to detect the heat dissipation, installation stability and appearance of the charging pile.

[0045] It should be noted that in the drawing display of the present scheme, the detection terminal 201 is arranged on the mobile base 101, and the traction assembly 202 and the detection assembly 203 are arranged on the upper surface of the detection terminal 201, in order to reduce the influence of gravity on the mobile base 101 arranged in suspension, the detection terminal 201 can be arranged in the mobile vehicle 100, and only the traction assembly 202 and the detection assembly 203 are arranged on the mobile base 101.

[0046] It should be noted that when detecting, the charging gun of the charging pile needs to be inserted into the socket of the detection terminal 201 to simulate the charging process of the new energy vehicle by the charging pile. Therefore, if the detection terminal 201 is arranged in the mobile vehicle 100, a reserved port needs to be arranged on the side of the mobile vehicle 100 to facilitate the insertion of the charging gun into the socket.

[0047] It should be noted that in addition to detecting the heat dissipation, installation stability and appearance of the charging pile by the detection assembly 203, the detection terminal 201 is also provided with an AC / DC load detection system, an integrated detection module, an intelligent analysis system, etc.; the integrated detection module is provided with an electrical performance test unit, a communication protocol analysis unit and a safety protection detection unit, etc., which can simultaneously complete the detection of multiple indicators such as output voltage, current, insulation resistance and communication compatibility of the charging pile; the intelligent analysis system processes the detection data in real time and generates a standardized report, which supports wireless transmission to a cloud platform; all of these can be realized by the prior art, and will not be described in detail.

[0048] It should be noted that a fire extinguisher, folding table and chairs, etc. can also be arranged in the mobile vehicle 100 for use as needed.

[0049] Reference Figures 6-10 The traction assembly 202 includes a fixing seat 204 arranged on the upper surface of the detection terminal 201 or the mobile base 101.

[0050] The fixing seat 204 is slidably provided with a sliding seat 206 along the vehicle width direction, and the sliding seat 206 is driven to move by a first linear module 205 arranged on the fixing seat 204; the first linear module 205 and the second linear module 210 mentioned later can adopt existing electric telescopic rod technology or existing screw rod linear motion technology, etc., which will not be described in detail.

[0051] The sliding seat 206 is hingedly provided with a stand 209, and the hinge shaft formed at the hinge is parallel to the vehicle width direction; when not in use, the extension direction of the stand 209 is parallel to the vehicle length direction and lies flat on the upper surface of the mobile base 101 or the detection terminal 201; when in use, the stand 209 is deflected by ninety degrees and arranged vertically.

[0052] The sliding seat 206 is provided with a first motor 207, and the first motor 207 and the hinge shaft are connected by a power connecting piece 208 to form a power connection, further, the route of the power connecting piece 208 includes a worm gear, and the first motor 207 can drive the stand 209 to switch between the horizontal state and the vertical state.

[0053] The stand 209 is slidably provided with a connecting seat 211 along the extension direction of the stand 209, and the connecting seat 211 is driven to move by a second linear module 210 arranged on the stand 209.

[0054] The connecting seat 211 is hinged to an intermediate seat 217, and the hinge axis formed at the hinge point is parallel to the vehicle width direction.

[0055] Furthermore, hinge shaft one is fixedly mounted on slide 206, column 209 is movably connected to hinge shaft one, hinge shaft two is fixedly mounted on intermediate seat 217, hinge shaft two is movably connected to connecting seat 211, and connecting shaft 212 is provided on column 209, the axis of connecting shaft 212 is parallel to the extension direction of column 209.

[0056] A first bevel gear set 213 is provided between the connecting shaft 212 and the hinge shaft 1. Therefore, when the column 209 deflects, the connecting shaft 212 can be rotated through the first bevel gear set 213.

[0057] A second bevel gear set 214 is provided between the connecting shaft 212 and the second hinge shaft. The driving bevel gear of the second bevel gear set 214 is set on the connecting shaft 212 via a spline. When the connecting seat 211 moves with the driving bevel gear, the connecting shaft 212 and the driving bevel gear maintain a power connection. In addition, the driving bevel gear is connected to the connecting seat 211 via a bearing. Therefore, the movement of the connecting seat 211 will move the driving bevel gear together. Furthermore, when the column 209 deflects and causes the connecting shaft 212 to rotate, the connecting shaft 212 drives the second hinge shaft to rotate via the second bevel gear set 214. The second hinge shaft rotates together with the intermediate seat 217.

[0058] A horizontal column 215 is slidably mounted on the intermediate seat 217 along the length of the vehicle. Rotation of the intermediate seat 217 causes the horizontal column 215 to rotate as well. The transmission ratio between the first bevel gear set 213 and the second bevel gear set 214 is one. Therefore, the degree of deflection of the column 209 will cause the intermediate seat 217 to deflect by the same degree. Furthermore, due to the cooperation of the connecting shaft 212, the first bevel gear set 213, and the second bevel gear set 214, the intermediate seat 217 will simultaneously deflect in the opposite direction by a corresponding angle. Therefore, when the column 209 rotates, the horizontal column 215 remains horizontal. Figure 4 and Figure 5 The upright column 209 and the horizontal column 215 can be kept horizontal to minimize volume and space occupation. Alternatively, the upright column 209 can be switched to a vertical position while the horizontal column 215 remains horizontal and increases in height, thereby enabling the traction detection component 203 to quickly be positioned above the charging pile to be tested.

[0059] Reference Figure 9The horizontal column 215 is provided with a driving part 216 for driving the horizontal column 215 to move, specifically, the driving part 216 comprises a threaded shaft provided on the horizontal column 215, the axis of the threaded shaft is parallel to the vehicle length direction, the threaded shaft is in threaded connection with the middle seat 217, and the input end of the threaded shaft is connected with a third motor in power, so that when the third motor drives the threaded shaft to rotate, the threaded shaft moves while rotating, and the movement of the threaded shaft drives the horizontal column 215 to move.

[0060] With reference to Figure 9 With Figure 10 The detection assembly 203 is arranged on the side of the horizontal column 215 away from the front of the mobile vehicle 100, and comprises a ring seat 2031 arranged on the horizontal column 215, the ring seat 2031 is provided with a rotating ring 2033 and a second motor 2032 for driving the rotating ring 2033 to rotate, and the axis of the rotating ring 2033 is vertically arranged.

[0061] The inner ring surface of the rotating ring 2033 is provided with a temperature detection element 2034, a camera element 2035 and a probe 2036, wherein the temperature detection element 2034 can adopt existing temperature sensors or thermal imaging technology, the camera element 2035 can adopt existing camera technology, and the probe 2036 is arranged on the inner ring surface of the rotating ring 2033 through a pressure sensor, and the reaction force received by the probe 2036 can be monitored through the pressure sensor.

[0062] Working principle of the application:

[0063] Firstly, the mobile vehicle 100 is reversed into a parking space, and in this process, the reversing radar and the reversing camera arranged at the rear of the mobile vehicle 100 cooperate to enable the staff to clearly know the distance between the mobile vehicle 100 and the charging pile behind the mobile vehicle 100, and when the distance reaches a set value, the parking is completed;

[0064] The rear door is opened, and the existing electric push rod and other technologies are used to drive the mobile base 101 to move towards the charging pile, so that the detection member 200 moves together with the mobile base 101, so that the detection member 200 extends out of the mobile vehicle 100 and approaches the charging pile;

[0065] The first motor 207 is started to drive the vertical column 209 to rotate by ninety degrees, and in the rotating process, the horizontal column 215 is kept in a horizontal state and rotates with the vertical column 209 through the cooperation of the connecting shaft 212, the first bevel gear set 213 and the second bevel gear set 214, that is, the appearance shown in Figure 4 is switched to Figure 5As shown, in this process, the detection assembly 203 can be kept vertical, and directly moved from point A to point B, where point A refers to the position of the detection assembly 203 in the detection member 200 when the moving base 101 extends the detection member 200 out of the moving vehicle 100, and point B refers to the position of the detection assembly 203 when it is above the charging pile, so that: the present scheme can quickly and timely displace the detection assembly 203 to the charging pile, improving the detection efficiency; the present scheme can ensure that the axis of the detection assembly 203 remains vertical, which can improve the detection accuracy in the subsequent detection process;

[0066] After that:

[0067] a, insert the charging gun head of the charging pile into the socket of the detection terminal 201, then the second linear module 210 pulls the detection assembly 203 to move up and down in the vertical direction, and the temperature detection element 2034 monitors the temperature of the charging charging pile, so as to realize the detection of the heat dissipation performance, at the same time, the appearance of the charging pile is detected by the camera element 2035, including but not limited to whether rusting, cracking and the like occurs;

[0068] b, the detection assembly 203 is moved in the vertical direction by the second linear module 210, the detection assembly 203 is driven to move in the vehicle length direction by the driving member 216, and the detection assembly 203 is driven to move in the vehicle width direction by the first linear module 205, so that the probe 2036 contacts the charging pile and applies a pushing force to the charging pile, and at the same time, the pressure sensor monitors the reaction force applied to the probe 2036 in real time, the reaction force and the pushing force are the same, therefore, if the reaction force becomes smaller, it means that the charging pile has deviated and is not installed stably, on the contrary, if the reaction force does not change, it means that the charging pile has not deviated and is installed stably.

[0069] Further, since the axis of the detection assembly 203 remains vertical, the pushing force applied to the charging pile is the same as the set value, if the axis deviates slightly, the pushing force applied to the charging pile is composed of the vertical component and the horizontal component, and the horizontal component is the actual pushing force applied to the charging pile, so that the detection result is not accurate.

[0070] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A special vehicle for rapid inspection of charging piles, comprising a mobile vehicle (100), wherein the mobile vehicle (100) has a rear door at its rear, characterized in that, A mobile base (101) is slidably installed inside the mobile vehicle (100) along the length of the vehicle. A traction component (202) and a detection component (203) are installed on the upper surface of the mobile base (101). A detection terminal (201) is installed inside the mobile vehicle (100). A socket that matches the charging gun is installed on the detection terminal (201). The traction assembly (202) includes a fixed seat (204) disposed on the upper surface of the movable base (101), a slide seat (206) slidably disposed on the fixed seat (204) along the vehicle width direction, a column (209) hingedly disposed on the slide seat (206), a connecting seat (211) slidably disposed on the column (209) along its own extension direction, an intermediate seat (217) hingedly disposed on the connecting seat (211), a cross column (215) slidably disposed on the intermediate seat (217) along the vehicle length direction, a driving member (216) for driving itself to move is disposed on the cross column (215), and a detection assembly (203) is disposed on the side of the cross column (215) away from the front of the moving vehicle (100); During the deflection of the column (209), the horizontal column (215) remains horizontal; The detection assembly (203) includes a ring seat (2031) disposed on a cross column (215), a rotating ring (2033) disposed on the ring seat (2031) and a second motor (2032) for driving the rotating ring (2033) to rotate, and the axis of the rotating ring (2033) is arranged vertically; The inner ring surface of the rotating ring (2033) is provided with a temperature detection element (2034), a camera element (2035) and a probe (2036). The probe (2036) is set on the inner ring surface of the rotating ring (2033) through a pressure sensor.

2. A special vehicle for rapid inspection of charging piles according to claim 1, characterized in that, The mobile vehicle (100) is equipped with an electric push rod for moving the mobile base (101), the fixed base (204) is equipped with a first linear module (205) for moving the slide (206), and the column (209) is equipped with a second linear module (210) for moving the connecting base (211).

3. A special vehicle for rapid inspection of charging piles according to claim 1, characterized in that, The hinge axis formed at the hinge between the slide (206) and the column (209) is parallel to the vehicle width direction, and the hinge axis formed at the hinge between the connecting seat (211) and the intermediate seat (217) is parallel to the vehicle width direction.

4. A special vehicle for rapid inspection of charging piles according to claim 3, characterized in that, A first motor (207) is provided on the slide (206). The first motor (207) and the first hinge shaft are connected by a power connector (208). The first hinge shaft and the second hinge shaft are connected by a power transmission component. The transmission ratio of the power transmission component is one. Hinged shaft one is fixedly mounted on slide (206), and column (209) is movably connected to hinged shaft one. Hinged shaft two is fixedly mounted on intermediate seat (217), and hinged shaft two is movably connected to connecting seat (211).

5. A special vehicle for rapid inspection of charging piles according to claim 4, characterized in that, The power transmission assembly includes a connecting shaft (212) disposed on a column (209), the axis of the connecting shaft (212) being parallel to the extension direction of the column (209); A first bevel gear set (213) is provided between the connecting shaft (212) and the hinge shaft. A second bevel gear set (214) is provided between the connecting shaft (212) and the hinge shaft 2. The driving bevel gear of the second bevel gear set (214) is set on the connecting shaft (212) through a spline. When the connecting seat (211) moves with the driving bevel gear, the connecting shaft (212) and the driving bevel gear maintain a power connection.

6. A special vehicle for rapid inspection of charging piles according to claim 4, characterized in that, The power connection route of the power connector (208) includes a worm gear.

7. A special vehicle for rapid inspection of charging piles according to claim 4 or 5, characterized in that, The drive unit (216) includes a threaded shaft mounted on a crossbar (215). The axis of the threaded shaft is parallel to the length of the vehicle. The threaded shaft and the intermediate seat (217) form a threaded connection. The input end of the threaded shaft is powered by a third motor.

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