Automatic mounting device for pagoda joint and hose

Abstract

The utility model provides an automatic mounting device for a pagoda joint and a hose, which comprises a pagoda joint rotary propelling assembly and a hose fixing assembly, and further comprises a control assembly for controlling the pagoda joint rotary propelling assembly and the hose fixing assembly to move, the pagoda joint rotary propelling assembly comprises a first linear driving structure, and the hose fixing assembly comprises a second linear driving structure. The rotation driving structure is driven by the first linear driving structure, the driving end of the rotation driving structure is provided with an adapter connected with the tail end of a pagoda joint in a limiting mode, the hose fixing assembly comprises a hose clamping assembly, and the hose clamping assembly comprises a clamping block used for clamping a hose. And the second linear driving structure drives the clamping block to clamp or loosen the hose, and after the hose fixing assembly fixes the hose, the pagoda connector rotating propelling assembly can drive the front end of the pagoda connector to be rotatably inserted into the hose. According to the utility model, the hose can be uniformly attached to the conical surface of the pagoda joint, and the sealing performance after installation is improved.

Description

Technical Field

[0001] This utility model relates to the field of automatic connector installation, specifically to an automatic installation device for a pagoda connector and a flexible hose. Background Technology

[0002] The pagoda connector is a widely used connection component in fluid transmission systems, such as hydraulic oil circuits, pneumatic pipelines, and water pressure pipelines. Its multi-stage tapered structure achieves a sealed connection with the hose through interference fit. It is widely used in technical fields such as hydraulic transmission systems, pneumatic devices, beverage equipment, and medical devices.

[0003] In existing technologies, the assembly of the pagoda connector and hose often relies on manual labor. The hose is inserted into the conical surface of the pagoda connector, and the pagoda head is gradually pushed into the hose. Sometimes, even auxiliary tools such as pliers are needed to complete the assembly, which is both time-consuming and labor-intensive. Installing the pagoda connector and hose manually requires a lot of force to gradually push them in. Long-term operation can easily lead to operator fatigue and low efficiency. If auxiliary tools such as pliers are used to clamp the water pipe, there is a risk of damaging the outer wall of the water pipe.

[0004] There are also some auxiliary insertion devices that force the water pipe directly into the pagoda connector. Although this solves the problem of laborious manual installation to some extent, it also has some drawbacks. For example, when the water pipe is forced directly into the pagoda connector along the axial direction, the contact area between the hose and the conical step of the pagoda connector is large, resulting in high instantaneous static friction resistance. It is difficult to install it in place in one go, and it may even scratch the inner wall of the water pipe, affecting its sealing performance.

[0005] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0006] To address the problems in existing technologies, this invention provides an automatic installation device for a pagoda connector and a flexible hose. A rotational motion is added during the insertion and pushing process. When the pagoda connector and the hose come into contact, the instantaneous static friction is transformed into rolling friction. This significantly reduces frictional resistance during insertion and greatly reduces the risk of scratching the inner wall of the hose. Simultaneously, the rotational operation ensures that the hose evenly conforms to the conical surface of the pagoda connector, avoiding excessive local compression or wrinkling, ensuring complete contact of the sealing surface, and reducing the risk of leakage.

[0007] The automatic installation device for pagoda connectors and hoses of this utility model includes a base plate, a pagoda connector rotation and propulsion assembly and a hose fixing assembly disposed on the base plate, and a control assembly for controlling the movement of the pagoda connector rotation and propulsion assembly and the hose fixing assembly.

[0008] The pagoda connector rotary propulsion assembly includes a first linear drive structure and a rotary drive structure driven by the first linear drive structure. The drive end of the rotary drive structure is provided with an adapter seat. The front end of the adapter seat is provided with a connecting groove that is limited to the tail end of the pagoda connector. The hose fixing assembly includes a hose clamping assembly. The hose clamping assembly includes a clamping block for clamping the hose and a second linear drive structure for driving the clamping block to clamp or release the hose. After the hose fixing assembly fixes the hose, the pagoda connector rotary propulsion assembly can drive the front end of the pagoda connector to rotate and insert into the hose, realizing the automatic installation of the two.

[0009] Furthermore, the hose fixing assembly also includes a hose positioning assembly for positioning the initial position of the hose. The hose positioning assembly includes an elastic limiting seat and a hose limiting seat. The elastic limiting seat is disposed near the pagoda connector rotation propulsion assembly. The elastic limiting seat and the hose limiting seat are provided with limiting grooves for limiting the placement position of the hose. The hose clamping assembly is disposed between the elastic limiting seat and the hose limiting seat.

[0010] Furthermore, the elastic limiting seat includes a first fixing block and a second fixing block disposed on the base plate, a first elastic limiting block and a second elastic limiting block disposed between the first fixing block and the second fixing block, the first elastic limiting block being connected to the first fixing block via a first elastic element, the second elastic limiting block being connected to the second fixing block via a second elastic element, and a limiting groove for clamping the hose and matching the outer diameter of the hose being disposed between the first elastic limiting block and the second elastic limiting block.

[0011] Furthermore, both the first elastic element and the second elastic element are compression springs, and the first fixing block and the second fixing block are provided with pull rod screws, with the compression springs sleeved on the pull rod screws.

[0012] Furthermore, the first linear drive structure is a first dual-axis cylinder, the rotary drive structure is a geared motor, and there are two geared motors, which are respectively fixed to the drive end of the drive shaft of the first dual-axis cylinder. The number of limiting grooves on the hose fixing assembly is two sets, which are used to fix two hoses to realize dual-station automatic installation.

[0013] Furthermore, the clamping block includes a first clamping block fixed between the two hoses, and a second clamping block and a third clamping block respectively disposed on both sides of the two hoses. The first clamping block, the second clamping block and the third clamping block are provided with arc surfaces that cooperate to clamp the hoses, and the shape of the arc surfaces is adapted to the outer surface of the hoses.

[0014] Furthermore, the second linear drive structure includes a second dual-axis cylinder for driving the second clamping block to move and a third dual-axis cylinder for driving the third clamping block to move.

[0015] Furthermore, the control component includes a pressure regulating valve, a first pneumatic solenoid valve, a second pneumatic solenoid valve, and a push-button switch for controlling the first and second pneumatic solenoid valves. The first pneumatic solenoid valve is disposed between the pressure regulating valve and the first dual-axis cylinder, and the second pneumatic solenoid valve is disposed between the pressure regulating valve, the second dual-axis cylinder, and the third dual-axis cylinder. The pressure regulating valve is used to connect to external air pressure and adjust the external air pressure to the working air pressure. The push-button switch is also used to control the electrical conduction of the geared motor.

[0016] Furthermore, the control component also includes a time relay connected to the first pneumatic solenoid valve, the time relay being used to control the first pneumatic solenoid valve to delay its activation.

[0017] Furthermore, the pagoda joint rotary propulsion assembly also includes a switch for controlling the rotary drive structure to stop rotating. The switch includes a magnetic induction block disposed on the rotary drive structure and a normally closed magnetic induction switch disposed at the end of the stroke of the rotary drive structure.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: The pagoda connector rotary propulsion assembly of this invention not only includes a linear drive structure but also adds a rotary drive structure, thereby realizing rotary propulsion during the docking process between the pagoda connector and the hose. When the pagoda connector and the hose come into contact, the instantaneous static friction is transformed into rolling friction, which significantly reduces the frictional resistance during propulsion and greatly reduces the risk of scratching the inner wall of the hose. At the same time, the rotation operation allows the hose to uniformly conform to the conical surface of the pagoda connector, avoiding excessive local compression or wrinkling, ensuring complete contact of the sealing surface, and reducing the risk of leakage.

[0019] This utility model, combined with actual production and assembly needs, adopts a dual-station rotary propulsion structure, which can complete the installation of two pagoda connectors and hoses at one time, reducing the workload and greatly improving the installation efficiency. Attached Figure Description

[0020] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation frame in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the hose clamping assembly in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the pagoda joint rotary propulsion assembly in an embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the control component in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the hose positioning assembly in an embodiment of the present invention;

[0027] Figure 7 This is a circuit control schematic diagram in an embodiment of the present invention.

[0028] Figure label:

[0029] 1. Base plate; 2. Support plate; 3. Foot pad; 4. First dual-axis cylinder; 5. Second dual-axis cylinder; 6. Third dual-axis cylinder; 7. Gear motor; 8. Pressure regulator; 9. Time relay; 10. First pneumatic solenoid valve; 11. Air pipe; 12. Hose; 13. Hose limit seat; 14. Power control board; 15. Normally closed magnetic induction switch; 16. Guide seat; 17. Fixing plate; 18. Support column; 19. Second clamping block; 20. Third clamping block; 21. First clamping block. 22. Auxiliary guide block, 23. Y-type tee connector, 24. Speed ​​control connector, 25. Adapter, 26. Sliding block, 27. Magnetic induction block, 28. Second pneumatic solenoid valve, 29. Spacer column, 30. Push button switch, 31. First indicator light, 32. Second indicator light, 33. First elastic limit block, 34. Second elastic limit block, 35. First compression spring, 36. Second compression spring, 37. Fixing block, 38. Pull rod screw, 39. Pagoda connector. Detailed Implementation

[0030] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order.

[0031] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figures 1-7 As shown, the automatic installation device for the pagoda connector and hose of this utility model includes a base plate 1, a pagoda connector rotation and propulsion assembly and a hose fixing assembly disposed on the base plate 1, and a control assembly for controlling the movement of the pagoda connector rotation and propulsion assembly and the hose fixing assembly, wherein,

[0034] The pagoda connector rotary propulsion assembly includes a first linear drive structure and a rotary drive structure driven by the first linear drive structure. The drive end of the rotary drive structure has an adapter seat, and the front end of the adapter seat has a connecting groove for limiting connection with the tail end of the pagoda connector. The hose fixing assembly includes a hose clamping assembly, which includes a clamping block for clamping the hose and a second linear drive structure for driving the clamping block to clamp or release the hose. After the hose fixing assembly fixes the hose, the pagoda connector rotary propulsion assembly can drive the front end of the pagoda connector to rotate and insert into the hose, achieving automatic installation of both. Preferably, the hose fixing assembly further includes a hose positioning assembly for positioning the initial position of the hose.

[0035] In this example, the first and second linear drive structures can be hydraulic, pneumatic, or electric drive structures, while the rotary drive structure can be an electric motor, motor, or similar device.

[0036] like Figures 1-6 As shown, in a preferred embodiment of this utility model, both the first linear motor drive structure and the second linear motor drive structure in this example adopt a dual-axis cylinder and are uniformly controlled by a control component. The control component in this example includes a pressure regulating valve 8, a first pneumatic solenoid valve 10, a second pneumatic solenoid valve 28, and a push-button switch 30 for controlling the first pneumatic solenoid valve 10 and the second pneumatic solenoid valve 28. The control component also includes a time relay 9 connected to the first pneumatic solenoid valve 10, which is used to control the first pneumatic solenoid valve 10 to conduct with a delay.

[0037] Specifically, in this example, a foot pad 3 is installed under the base plate 1. A set of pagoda connector rotary propulsion components and hose positioning components are arranged axially on the upper surface of the base plate 1 to ensure axial alignment of the pagoda connector and hose. The rear end of the pagoda connector rotary propulsion component in this example is a first dual-axis cylinder 4. A sliding block 26 is fixed to the drive end of the first dual-axis cylinder 4. Two geared motors 7 are arranged side-by-side on the sliding block 26. A guide seat 16 is also provided below the sliding block 26 on the base plate 1 for guiding the sliding of the sliding block 26. In this example, an adapter seat 25 is installed at the front end of each of the two geared motors 7.

[0038] In addition, after installation, this example also includes a switch to control the reduction motor 7 to stop rotating. The switch includes a magnetic induction block 27 located at the front end of the sliding block 26 and a normally closed magnetic induction switch 15 located on the guide seat 16. When the magnetic induction block 27 approaches the normally closed magnetic induction switch 15, the normally closed magnetic induction switch 15 opens, the reduction motor 7 is de-energized, and stops rotating.

[0039] This utility model, combined with actual production and assembly needs, adopts a dual-station rotary propulsion structure, which can complete the installation of two pagoda connectors and hoses at one time, reducing the workload and greatly improving the installation efficiency.

[0040] In this example, a support plate 2 is also installed on the base 1 via a support column 18 for fixing the hose fixing assembly. The height of the support plate 2 is set according to requirements to ensure the coaxiality of the pagoda connector and the hose. A fixing plate 17 is also provided on one side of the support plate 2 for fixing the pressure regulating valve 8.

[0041] like Figure 6 As shown, the hose positioning assembly in this example includes an elastic limiting seat and a hose limiting seat 13. The elastic limiting seat is located near the pagoda connector rotation propulsion assembly. Both the elastic limiting seat and the hose limiting seat 13 have limiting grooves to limit the placement position of the hose 12. The elastic limiting seat in this example includes two fixing blocks 37 disposed on the base plate. Four elastic limiting blocks are arranged between the two fixing blocks 37, forming two sets for clamping the two hoses. The first set of elastic limiting blocks includes a first elastic limiting block 33 and a second elastic limiting block 34. The first elastic limiting block 33 is connected to the fixing block 37 through a first elastic element 35. The second elastic limiting block 34 is connected to the second set of elastic limiting blocks through a second elastic element 36. A limiting groove for clamping the hose and matching the outer diameter of the hose is disposed between the first elastic limiting block 33 and the second elastic limiting block 34.

[0042] In this example, both the first elastic element 35 and the second elastic element 36 are compression springs. The fixing block is provided with a pull rod screw 38, and the compression spring is sleeved on the pull rod screw 38.

[0043] like Figure 3 As shown, the hose clamping assembly in this example includes a first clamping block 21, a second clamping block 19 and a third clamping block 20 respectively disposed on both sides of the first clamping block 21. The first clamping block 21, the second clamping block 19, and the third clamping block 20 are provided with interlocking arc surfaces that clamp the hose, and the shape of the arc surfaces is adapted to the outer surface of the hose. In this example, the first clamping block 21 is fixed to the support plate 2, the second clamping block 19 is fixed to the drive end of the second dual-axis cylinder 5, and the third clamping block 20 is fixed to the drive end of the third dual-axis cylinder 6.

[0044] like Figure 1 , Figure 3 , Figure 5 and Figure 7 As shown, in this example, a power control board 14 is provided on the base plate 1 to provide working power to the various electrical components of this utility model. The push-button switch 30 and the first indicator light 31 and the second indicator light 32 are provided on the power control board 14. The first indicator light 31 and the second indicator light 32 are used to indicate the working status of the device of this utility model.

[0045] In this example, the input of the pressure regulator 8 is connected to external air pressure to adjust it to the working air pressure. The output air pipe branches into two paths: one path connects to the first dual-axis cylinder 4 via the first pneumatic solenoid valve 10, and the other path connects to the input of the first pneumatic solenoid valve 28. The output of the first pneumatic solenoid valve 28 is connected to the second dual-axis cylinder 5 and the third dual-axis cylinder 6 via a Y-type three-way connector 23. In this example, the first pneumatic solenoid valve 10 controls the pushing and pulling operation of the first dual-axis cylinder 4, while the second pneumatic solenoid valve 28 simultaneously controls the pushing and pulling operation of the second dual-axis cylinder 5 and the third dual-axis cylinder 6. The pushing and pulling speeds of these three dual-axis cylinders are adjusted via a speed regulating connector 24.

[0046] The circuit of the first pneumatic solenoid valve 10 is connected to a time controller 9, which serves to delay the conduction. In this example, the delay conduction time of the time controller is set to 2 seconds, but it can also be adjusted according to actual needs.

[0047] The workflow in this example is as follows:

[0048] (1) Connect the external air pressure and set the working air pressure of the pressure regulator 8. In this example, the external input air pressure is 0.8Mpa and the setting air pressure of the pressure regulator 8 is 0.55Mpa (the air pressure can also be adjusted as needed). At this time, the first dual-shaft cylinder 4, the second dual-shaft cylinder 5, and the third dual-shaft cylinder 6 are all in the pull-back state.

[0049] (2) Power the power control board 14 with DC 12V, and the first indicator light 31 will light up.

[0050] (3) Place the two pagoda connectors 39 into the adapter 25 respectively, and insert the front ends of the two hoses 12 into the limiting groove formed by the first elastic limiting block 33 and the second elastic limiting block 34. Insert the other end of the hose into the hose limiting seat 13.

[0051] (4) Press the button switch 30, and the second indicator light 32 will light up. At this time, the second dual-shaft cylinder 5 drives the second clamping block 19, and the third dual-shaft cylinder 6 drives the third clamping block 20 to move closer to the first clamping block 21 to clamp the hose 12. At the same time, the two reduction motors 7 also start to rotate. In this case, the speed of the reduction motor is controlled at 2 revolutions per second.

[0052] (5) After the time controller 9 works for 2 seconds, the first dual-axis cylinder 4 drives the sliding block 26 and the reduction motor 7 to gradually move forward. The pagoda connector 39 rotates and inserts into the hose 12. When the magnetic induction block 27 moves close to the normally closed magnetic induction switch 15, the normally closed magnetic induction switch is opened, the reduction motor 7 is de-energized and stops rotating. At this time, the pagoda head of the pagoda connector has been completely inserted into the hose.

[0053] As the pagoda connector is inserted into the hose, the hose mating part will expand and thicken, and the first elastic limiting block 33 and the second elastic limiting block 34 will slide elastically to both sides to prevent jamming.

[0054] (6) Release the button switch 30, the second indicator light 32 goes out, the first dual-axis cylinder 4 pulls the sliding block 26 and the reduction motor 7 back together, the second dual-axis cylinder 5 pulls the second clamping block 19 open, the third dual-axis cylinder 6 pulls the third clamping block open, and the first elastic limit block 33 and the second elastic limit block 34 return to their elastic positions.

[0055] (7) Remove the water pipe with the pagoda connector already installed to complete one round of installation.

[0056] As can be seen from the above, the pagoda connector rotary propulsion assembly of this utility model not only includes a linear drive structure but also adds a rotary drive structure, thereby realizing rotary propulsion during the docking process between the pagoda connector and the hose. When the pagoda connector and the hose come into contact, the instantaneous static friction is transformed into rolling friction, which significantly reduces the frictional resistance during propulsion and greatly reduces the risk of scratching the inner wall of the hose. At the same time, the rotation operation allows the hose to uniformly conform to the conical surface of the pagoda connector, avoiding excessive local compression or wrinkling, ensuring complete contact of the sealing surface, and reducing the risk of leakage.

[0057] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. An automatic installation device for a pagoda-shaped connector and a flexible hose, characterized in that: The system includes a base plate, a pagoda-shaped connector rotary propulsion assembly and a hose fixing assembly mounted on the base plate, and a control assembly for controlling the movement of the pagoda-shaped connector rotary propulsion assembly and the hose fixing assembly. The pagoda-shaped connector rotary propulsion assembly includes a first linear drive structure and a rotary drive structure driven by the first linear drive structure. The drive end of the rotary drive structure is provided with an adapter seat, and the front end of the adapter seat is provided with a connecting groove that is limited to the tail end of the pagoda-shaped connector. The hose fixing assembly includes a hose clamping assembly, which includes clamping blocks for clamping the hose, and a second linear drive structure for driving the clamping blocks to clamp or release the hose. After the hose fixing assembly secures the hose, the pagoda connector rotation and propulsion assembly can drive the front end of the pagoda connector to rotate and insert into the hose, thereby achieving automatic installation of both.

2. The automatic installation device for the pagoda connector and hose according to claim 1, characterized in that: The hose fixing assembly further includes a hose positioning assembly for positioning the initial position of the hose. The hose positioning assembly includes an elastic limiting seat and a hose limiting seat. The elastic limiting seat is disposed near the pagoda connector rotation propulsion assembly. The elastic limiting seat and the hose limiting seat are provided with limiting grooves for limiting the placement position of the hose. The hose clamping assembly is disposed between the elastic limiting seat and the hose limiting seat.

3. The automatic installation device for the pagoda connector and hose according to claim 2, characterized in that: The elastic limiting seat includes a first fixing block and a second fixing block disposed on the base plate, and a first elastic limiting block and a second elastic limiting block disposed between the first fixing block and the second fixing block. The first elastic limiting block is connected to the first fixing block through a first elastic element, and the second elastic limiting block is connected to the second fixing block through a second elastic element. A limiting groove for clamping the hose and matching the outer diameter of the hose is disposed between the first elastic limiting block and the second elastic limiting block.

4. The automatic installation device for the pagoda connector and hose according to claim 3, characterized in that: Both the first elastic element and the second elastic element are compression springs. The first fixing block and the second fixing block are provided with pull rod screws, and the compression springs are sleeved on the pull rod screws.

5. The automatic installation device for the pagoda connector and hose according to claim 2, characterized in that: The first linear drive structure is a first dual-axis cylinder, the rotary drive structure is a geared motor, and there are two geared motors, which are respectively fixed to the drive end of the drive shaft of the first dual-axis cylinder. There are two sets of limiting grooves on the hose fixing assembly, which are used to fix two hoses to realize dual-station automatic installation.

6. The automatic installation device for the pagoda connector and hose according to claim 5, characterized in that: The clamping block includes a first clamping block fixed between two hoses, and a second clamping block and a third clamping block respectively disposed on both sides of the two hoses. The first clamping block, the second clamping block and the third clamping block are provided with arc surfaces that cooperate to clamp the hoses, and the shape of the arc surfaces is adapted to the outer surface of the hoses.

7. The automatic installation device for the pagoda connector and hose according to claim 6, characterized in that: The second linear drive structure includes a second dual-axis cylinder that drives the second clamping block to move and a third dual-axis cylinder that drives the third clamping block to move.

8. The automatic installation device for the pagoda connector and hose according to claim 7, characterized in that: The control component includes a pressure regulating valve, a first pneumatic solenoid valve, a second pneumatic solenoid valve, and a push-button switch for controlling the first and second pneumatic solenoid valves. The first pneumatic solenoid valve is disposed between the pressure regulating valve and the first dual-axis cylinder, and the second pneumatic solenoid valve is disposed between the pressure regulating valve, the second dual-axis cylinder, and the third dual-axis cylinder. The pressure regulating valve is used to connect to external air pressure and adjust the external air pressure to the working air pressure. The push-button switch is also used to control the electrical conduction of the geared motor.

9. The automatic installation device for the pagoda connector and hose according to claim 8, characterized in that: The control component also includes a time relay connected to the first pneumatic solenoid valve, the time relay being used to control the first pneumatic solenoid valve to delay its activation.

10. The automatic installation device for the pagoda connector and hose according to any one of claims 1-9, characterized in that: The pagoda joint rotary propulsion assembly also includes a switch for controlling the rotary drive structure to stop rotating. The switch includes a magnetic induction block disposed on the rotary drive structure and a normally closed magnetic induction switch disposed at the end of the stroke of the rotary drive structure.

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