Surface machining and grinding equipment and method for automobile electric welcome pedal

Abstract

The invention belongs to the technical field of welcome pedal surface polishing, and particularly relates to surface machining and polishing equipment and method for an automobile electric welcome pedal, the surface machining and polishing equipment comprises a base, a camera and two connecting plates, a motor is fixedly installed on the connecting plate on the left side, and a rotating shaft is installed on a connecting plate bearing on the right side; the output end of the motor is fixedly connected with a shaft rod, wheel rings are fixedly installed on the outer side of the shaft rod and the outer side of the rotating shaft correspondingly, a grinding piece is connected between the two wheel rings in a sleeving mode, a cavity is fixedly installed above the base, two sliding holes are formed in the surface of the cavity, and placement blocks are slidably connected into the two sliding holes correspondingly; according to the device, the problems that when a welcome pedal is roughly polished at present, the polishing force cannot be effectively controlled, size polishing is excessive, and the polishing quality is affected are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of surface polishing of a welcome pedal, and in particular relates to a surface processing and polishing device and method for an electric welcome pedal of an automobile. Background Art

[0002] The electric welcome pedal is an auto part used to decorate the door sill of the car, and it plays a role in protecting and beautifying the car body. It is one of the car modification products. The surface roughness of the electric welcome pedal needs to be polished during the production process. Choose the appropriate sandpaper for polishing according to the material of the pedal. According to the coarseness of the sandpaper, it is divided into coarse grinding and fine grinding. During coarse grinding, the current grinding equipment cannot control the grinding force, resulting in excessive grinding of the surface of the welcome pedal during the coarse grinding process, resulting in the inability to guarantee dimensional accuracy and affecting the processing quality. This phenomenon has become a problem that needs to be solved urgently by people in this field. Summary of the invention

[0003] The object of the present invention is to provide a surface processing and polishing device and method for an electric welcome pedal of an automobile, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a surface processing and polishing device and method for an electric welcome pedal for an automobile, comprising a base, a camera and two connecting plates, the connecting plate on the left side is fixedly installed with a motor, and the connecting plate bearing on the right side is installed with a rotating shaft; the output end of the motor is fixedly connected with a shaft rod, the outer sides of the shaft rod and the rotating shaft are fixedly installed with wheel rings, and a polishing sheet is sleeved between the two wheel rings, a chamber is fixedly installed above the base, two sliding holes are provided on the surface of the chamber, and placement blocks are slidably connected in the two sliding holes, and placement grooves are provided above the placement blocks, the camera is fixedly installed on the left side of the left placement block and faces the placement block, the interior of the chamber is hollow, and a sleeve is fixedly installed at the bottom of the inner wall, a sliding rod is fixedly installed at the bottom end of the placement block, and the sliding rod is slidably connected in the sleeve.

[0005] The present invention further illustrates that a pneumatic chamber is fixedly installed on the left side of the inner wall of the chamber, and a pneumatic plate is slidably connected to the inner wall of the pneumatic chamber; a round rod is installed on the right bearing of the pneumatic plate, an extrusion rod is fixedly installed on the outer surface of the round rod, a ball rod is fixedly installed on the bottom of the placement block and horizontally aligned with the extrusion rod, and the extrusion rod is located on the left side of the placement block; the left side of the pneumatic chamber is connected to the external hydraulic pump pipeline, and the outer end of the extrusion rod and the lower end of the ball rod are both spherical.

[0006] The present invention further illustrates that a gear is fixedly installed on the right end of the round rod, and a tooth plate is meshed above the gear; an expansion joint is fixedly installed on the front end of the tooth plate, and the expansion joint is fixedly connected to the inner wall of the chamber, the expansion joint is connected to the right side pipeline of the air pressure chamber, and a pressure valve is arranged in the pipeline, the expansion joint is connected to the right side of the air pressure chamber with an exhaust pipe, and a control valve is arranged in the pipeline.

[0007] The present invention further illustrates that two support plates are fixedly installed at the bottom of the inner wall of the chamber, a balance rod is installed on a bearing between the two support plates, a pressing rod 1 is fixedly installed at the left end of the balance rod, and a pressing rod 2 is fixedly installed at the right end; the pressing rod 1 is aligned with the extrusion rod, a buffer rod is fixedly installed under the placement block, the buffer rod is aligned with the pressing rod 2, and the buffer rod is located on the rear side of the ball rod; the outer ends of the pressing rod 1, the pressing rod 2 and the buffer rod are all spherical.

[0008] The present invention further illustrates that the surface polishing equipment includes an intelligent polishing system, and the intelligent polishing system includes an image recognition module and a hydraulic control module; the image recognition module is arranged inside the camera and electrically connected to the hydraulic control module, and the hydraulic control module is electrically connected to an external hydraulic pump. The image recognition module is used to perform real-time image acquisition of the surface of the welcome pedal through the camera, so as to judge the surface roughness of the welcome pedal through the image, and the hydraulic control module is used to control the hydraulic size of the external hydraulic pump according to the surface roughness of the welcome pedal.

[0009] The present invention further illustrates that the method for using the surface processing and polishing equipment includes:

[0010] Step S1, placing the welcome pedal into the placement block, starting the surface processing and polishing equipment, the camera is running, the intelligent polishing system is running, and the motor is started at the same time, and the polishing sheet rotates at high speed through the wheel ring;

[0011] Step S2, the image recognition module determines the surface roughness of the welcome pedal through the camera, and then controls the operation of the external hydraulic pump according to the surface roughness of the welcome pedal, and controls its hydraulic pressure, so that the placement block rises, lifts the welcome pedal, and makes it contact with the grinding sheet for grinding;

[0012] Step S3, the hydraulic pressure of the external hydraulic pump controls the pressure between the welcome pedal and the grinding sheet, thereby controlling the grinding force. When the grinding force is the maximum, the process proceeds to step S4, otherwise, the process proceeds to step S5;

[0013] Step S4, the pressure valve is opened, the welcome pedal is rapidly lowered and is out of contact with the grinding sheet, and then the process proceeds to step S5;

[0014] Step S5: the external hydraulic pump is reset, the motor stops running, and the rough grinding is completed.

[0015] The present invention further illustrates that in step S2 and step S3, Where, F is the hydraulic pressure of the external hydraulic pump, F max is the maximum hydraulic pressure of the external hydraulic pump, R is the surface roughness of the welcome pedal, R max The maximum surface roughness of the welcome pedal. The rougher the welcome pedal is, the greater the hydraulic pressure of the external hydraulic pump is, and the stronger the grinding force is.

[0016] The present invention further illustrates that in step S3 and step S4, when R=R max When the pressure valve opens, the round rod rotates, and the welcome pedal drops quickly through the placement block.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention drives the welcome pedal to move upward through the placement block, so that the welcome pedal and the polishing sheet contact each other, the polishing sheet polishes the surface of the welcome pedal, and the welcome pedal presses the polishing sheet upward, so that the fitting force between the welcome pedal and the polishing sheet can be increased, thereby enhancing the polishing strength and improving the polishing efficiency;

[0018] And when the grinding force is strong, it can prevent the size of the welcome pedal from being over-grinded due to continuous high-force grinding, affecting the production quality of the welcome pedal, and fully protecting the welcome pedal, so that the extrusion rod and the ball rod are out of contact, and the placement block loses support and drops rapidly, so that the welcome pedal and the grinding sheet are instantly out of contact, which can avoid the grinding sheet over-grinding the welcome pedal due to high grinding force, resulting in damage to the surface size accuracy, thereby improving the grinding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the chamber of the present invention;

[0022] Figure 3 is a schematic plan view of the chamber of the present invention;

[0023] Figure 4 It is a schematic diagram of the connection relationship between the sleeve and the slide rod of the present invention;

[0024] Figure 5 It is a schematic diagram of the installation position of the balance bar of the present invention;

[0025] Figure 6It is a schematic diagram of the module connection relationship of the intelligent polishing system of the present invention;

[0026] In the figure: 1. base; 11. chamber; 12. placement block; 121. ball club; 122. buffer rod; 13. sleeve; 14. slide rod; 15. air pressure chamber; 151. air pressure plate; 152. round rod; 153. extrusion rod; 154. gear; 155. toothed plate; 156. telescopic joint; 16. pressure valve; 17. exhaust pipe; 18. support plate; 181. balance rod; 182. pressing rod one; 183. pressing rod two; 2. connecting plate; 3. motor; 4. rotating shaft; 5. shaft rod; 6. wheel ring; 7. grinding disc; 8. camera. DETAILED DESCRIPTION

[0027] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-6 The present invention provides a technical solution: a surface processing and polishing device and method for an electric welcome pedal of an automobile, comprising a base 1, a camera 8 and two connecting plates 2, wherein a motor 3 is fixedly mounted on the left connecting plate 2, and a rotating shaft 4 is mounted on the bearing of the right connecting plate 2;

[0029] The output end of the motor 3 is fixedly connected to the shaft 5, and the outer sides of the shaft 5 and the rotating shaft 4 are fixedly installed with wheel rings 6, and a grinding sheet 7 is sleeved between the two wheel rings 6. A chamber 11 is fixedly installed on the top of the base 1, and two sliding holes are provided on the surface of the chamber 11, and a placement block 12 is slidably connected in the two sliding holes. A placement groove is provided on the top of the placement block 12, and the camera 8 is fixedly installed on the left side of the left placement block 12 and faces the placement block 12. The interior of the chamber 11 is hollow, and a sleeve 13 is fixedly installed on the bottom of the inner wall, and a sliding rod 14 is fixedly installed on the bottom end of the placement block 12, and the sliding rod 14 is slidably connected in the sleeve 13.

[0030] A pneumatic chamber 15 is fixedly installed on the left side of the inner wall of the chamber 11, and a pneumatic plate 151 is slidably connected to the inner wall of the pneumatic chamber 15;

[0031] A round rod 152 is installed on the right bearing of the air pressure plate 151, and an extrusion rod 153 is fixedly installed on the outer surface of the round rod 152. A ball rod 121 is fixedly installed on the bottom of the placement block 12 and is horizontally aligned with the extrusion rod 153. The extrusion rod 153 is located on the left side of the placement block 12;

[0032] The left side of the air pressure chamber 15 is connected to an external hydraulic pump pipeline, and the outer end of the extrusion rod 153 and the lower end of the ball rod 121 are both spherical;

[0033] The operator places the welcome pedal in the placement groove of the placement block 12, and then the external hydraulic pump and the motor 3 operate simultaneously. The motor 3 drives the wheel ring 6 to rotate through the shaft 5, thereby driving the wheel ring 6 on the right side to rotate through the rotating shaft 4, so that the grinding sheet 7 rotates. The external hydraulic pump operates to inject liquid into the air pressure chamber 15. The left side of the air pressure plate 151 is squeezed by the liquid and slides to the right along the inner wall of the air pressure chamber 15, thereby driving the round rod 152 to move to the right. The round rod 152 drives the extrusion rod 153 to move to the right. The extrusion rod 153 and the ball rod 121 contact and squeeze each other, thereby supporting the ball rod 121 to move upward, so that the placement block 12 slides upward along the sleeve 13 through the sliding rod 14. The placement block 12 drives the welcome pedal to move upward, so that the welcome pedal and the grinding sheet 7 contact each other, and the grinding sheet 7 grinds the surface of the welcome pedal, and the welcome pedal squeezes the grinding sheet 7 upward, so that the fitting force between the welcome pedal and the grinding sheet 7 can be increased, thereby strengthening the grinding strength and improving the grinding efficiency.

[0034] A gear 154 is fixedly mounted on the right end of the round rod 152, and a toothed plate 155 is meshed above the gear 154;

[0035] A telescopic joint 156 is fixedly installed at the front end of the tooth plate 155, and the telescopic joint 156 is fixedly connected to the inner wall of the chamber 11, the telescopic joint 156 is connected to the right pipeline of the air pressure chamber 15, and a pressure valve 16 is arranged in the pipeline, and an exhaust pipe 17 is connected between the telescopic joint 156 and the right side of the air pressure chamber 15, and a control valve is arranged in the pipeline;

[0036] When the round rod 152 drives the extrusion rod 153 to move to the limit position on the right side, the extrusion rod 153 moves the placement block 12 upward to the limit distance through the ball rod 121. At this time, the air pressure plate 151 slides to the limit position on the right side along the inner wall of the air pressure chamber 15, and the pressure valve 16 opens when it reaches the pressure limit. The gas on the right side of the air pressure plate 151 quickly enters the telescopic joint 156 through the pipeline, causing it to quickly extend, driving the toothed plate 155 to quickly extend, thereby engaging with the gear 154 and driving the round rod 152 to rotate, causing the extrusion rod 153 to disengage from the ball rod 121, and the placement block 12 loses support and quickly drops, so that the welcome pedal is instantly disengaged from the grinding sheet 7, which can avoid excessive grinding of the welcome pedal by the grinding sheet 7 due to high grinding force, resulting in damage to the surface dimensional accuracy, thereby improving the grinding quality;

[0037] After the welcome pedal is instantly out of contact with the grinding disc 7, the external hydraulic pump quickly resets, so that the air pressure plate 151 is reset. After the reset, the control valve opens, negative pressure is generated on the right side of the air pressure plate 151, and the gas in the expansion joint 156 is extracted through the exhaust pipe 17 to reset it, so that the round rod 152 is reset through the engagement of the tooth plate 155 and the gear 154, so that the next grinding work can be carried out smoothly.

[0038] Two support plates 18 are fixedly installed at the bottom of the inner wall of the chamber 11, and a balance rod 181 is installed on a bearing between the two support plates 18. A pressing rod 182 is fixedly installed at the left end of the balance rod 181, and a pressing rod 2 183 is fixedly installed at the right end;

[0039] The first pressing rod 182 is aligned with the extrusion rod 153, and a buffer rod 122 is fixedly installed below the placement block 12, and the buffer rod 122 is aligned with the second pressing rod 183, and the buffer rod 122 is located at the rear side of the club 121;

[0040] The outer ends of the pressing rod 1 182, the pressing rod 2 183 and the buffer rod 122 are all spherical;

[0041] Through the above steps, when the external hydraulic pump is reset, the round rod 152 drives the extrusion rod 153 to rotate downward, and the extrusion rod 153 and the pressing rod 182 contact and squeeze each other, so that the pressing rod 182 is forced to move downward, and the pressing rod 183 is lifted upward through the balance rod 181. At this time, the placement block 12 descends, so that the buffer rod 122 and the pressing rod 183 collide with each other, so as to buffer the placement block 12 and prevent the placement block 12 from falling to the bottom and causing the upper welcome pedal to be shaken out of the placement groove, thereby protecting the welcome pedal. The collision between the buffer rod 122 and the pressing rod 183 produces vibration, which can shake off the polished impurities on the welcome pedal, so that the operator can observe the surface quality.

[0042] The surface grinding equipment includes an intelligent grinding system, and the intelligent grinding system includes an image recognition module and a hydraulic control module;

[0043] The image recognition module is arranged inside the camera 8 and is electrically connected to the hydraulic control module. The hydraulic control module is electrically connected to the external hydraulic pump. The image recognition module is used to collect real-time images of the surface of the welcome pedal through the camera 8, so as to judge the surface roughness of the welcome pedal through the image. The hydraulic control module is used to control the hydraulic size of the external hydraulic pump according to the surface roughness of the welcome pedal.

[0044] The use of surface processing and grinding equipment includes:

[0045] Step S1, placing the welcome pedal into the placement block 12, starting the surface processing and polishing equipment, the camera 8 is running, the intelligent polishing system is running, and the motor 3 is started, and the polishing sheet 7 is rotated at high speed through the wheel ring 6;

[0046] Step S2, the image recognition module determines the surface roughness of the welcome pedal through the camera 8, and then controls the operation of the external hydraulic pump according to the surface roughness of the welcome pedal, and controls its hydraulic pressure, the placement block 12 rises, lifts the welcome pedal, and makes it contact with the grinding sheet 7 for grinding;

[0047] Step S3, the hydraulic pressure of the external hydraulic pump controls the pressure between the welcome pedal and the grinding plate 7, thereby controlling the grinding force. When the grinding force is the maximum, step S4 is entered, otherwise, step S5 is entered;

[0048] Step S4, the pressure valve 16 is opened, the welcome pedal is rapidly lowered and is out of contact with the grinding sheet 7, and then the process proceeds to step S5;

[0049] Step S5: the external hydraulic pump is reset, the motor 3 stops running, and the rough grinding is completed.

[0050] In step S2 and step S3, Where, F is the hydraulic pressure of the external hydraulic pump, F max is the maximum hydraulic pressure of the external hydraulic pump, R is the surface roughness of the welcome pedal, R max The maximum surface roughness of the welcome pedal. The rougher the welcome pedal, the greater the hydraulic pressure of the external hydraulic pump and the stronger the grinding force.

[0051] For rougher welcome pedals, increase the pressure of the external hydraulic pump to increase the grinding force, which can quickly perform rough grinding on the welcome pedal and further improve the grinding efficiency. On the other hand, for smoother welcome pedals, grind with less force to leave enough grinding size for subsequent fine grinding and avoid over-grinding.

[0052] In step S3 and step S4, when R=R max When the pressure valve 16 is opened, the round rod 152 rotates, and the welcome pedal quickly descends through the placement block 12;

[0053] The strong grinding force at this time can prevent the size of the welcome pedal from being over-grinded due to continuous high-force grinding, affecting the production quality of the welcome pedal, and fully protecting the welcome pedal.

[0054] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0055] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surface processing and polishing device for an electric welcome pedal of an automobile, comprising a base (1), a camera (8) and two connecting plates (2), characterized in that: The connecting plate (2) on the left side is fixedly mounted with a motor (3), and the connecting plate (2) on the right side is bearing-mounted with a rotating shaft (4); The output end of the motor (3) is fixedly connected with a shaft (5), and the outer sides of the shaft (5) and the rotating shaft (4) are fixedly installed with wheel rings (6), and a grinding sheet (7) is sleeved between the two wheel rings (6). A chamber (11) is fixedly installed above the base (1), and the surface of the chamber (11) is provided with two sliding holes, and a placement block (12) is slidably connected in the two sliding holes. A placement groove is provided above the placement block (12), and the camera (8) is fixedly installed on the left side of the left placement block (12) and faces the placement block (12). The interior of the chamber (11) is hollow, and a sleeve (13) is fixedly installed at the bottom of the inner wall. A sliding rod (14) is fixedly installed at the bottom end of the placement block (12), and the sliding rod (14) is slidably connected in the sleeve (13).

2. The surface processing and polishing equipment of the electric welcome pedal of an automobile according to claim 1, characterized in that: A pneumatic chamber (15) is fixedly mounted on the left side of the inner wall of the chamber (11), and a pneumatic plate (151) is slidably connected to the inner wall of the pneumatic chamber (15); A round rod (152) is installed on the right bearing of the air pressure plate (151), an extrusion rod (153) is fixedly installed on the outer surface of the round rod (152), a ball rod (121) is fixedly installed on the bottom of the placement block (12) and is horizontally aligned with the extrusion rod (153), and the extrusion rod (153) is located on the left side of the placement block (12); The left side of the air pressure chamber (15) is connected to an external hydraulic pump pipeline, and the outer end of the extrusion rod (153) and the lower end of the ball rod (121) are both spherical.

3. The surface processing and polishing equipment of the electric welcome pedal of an automobile according to claim 2, characterized in that: A gear (154) is fixedly mounted on the right end of the round rod (152), and a toothed plate (155) is meshed above the gear (154); A telescopic joint (156) is fixedly mounted on the front end of the tooth plate (155), and the telescopic joint (156) is fixedly connected to the inner wall of the chamber (11). The telescopic joint (156) is connected to the right side pipeline of the air pressure chamber (15), and a pressure valve (16) is arranged in the pipeline. The telescopic joint (156) is connected to the right side of the air pressure chamber (15) through an exhaust pipe (17), and a control valve is arranged in the pipeline.

4. The surface processing and polishing equipment of the electric welcome pedal of an automobile according to claim 3 is characterized in that: Two support plates (18) are fixedly installed at the bottom of the inner wall of the chamber (11), a balance rod (181) is installed on a bearing between the two support plates (18), a first pressing rod (182) is fixedly installed at the left end of the balance rod (181), and a second pressing rod (183) is fixedly installed at the right end; The first pressing rod (182) is aligned with the squeezing rod (153), a buffer rod (122) is fixedly installed below the placement block (12), the buffer rod (122) is aligned with the second pressing rod (183), and the buffer rod (122) is located at the rear side of the ball rod (121); The outer ends of the pressing rod 1 (182), the pressing rod 2 (183) and the buffer rod (122) are all spherical.

5. A method for using a surface processing and polishing device for an electric welcome pedal of an automobile, according to any one of claims 1 to 4, characterized in that: The surface grinding device includes an intelligent grinding system, and the intelligent grinding system includes an image recognition module and a hydraulic control module; The image recognition module is arranged inside the camera (8) and is electrically connected to the hydraulic control module, and the hydraulic control module is electrically connected to the external hydraulic pump. The image recognition module is used to collect real-time images of the surface of the welcome pedal through the camera (8), so as to judge the surface roughness of the welcome pedal through the image, and the hydraulic control module is used to control the hydraulic pressure of the external hydraulic pump according to the surface roughness of the welcome pedal.

6. The method for using the surface processing and polishing equipment of the electric welcome pedal of an automobile according to claim 5, characterized in that: The method for using the surface processing and grinding equipment includes: Step S1, placing the welcome pedal into the placement block (12), starting the surface processing and polishing equipment, the camera (8), the intelligent polishing system, and at the same time the motor (3) is started, and the polishing sheet (7) is rotated at high speed through the wheel ring (6); Step S2, the image recognition module determines the surface roughness of the welcome pedal through the camera (8), and then controls the operation of the external hydraulic pump according to the surface roughness of the welcome pedal, and controls the hydraulic pressure, and the placement block (12) rises to lift the welcome pedal so that it contacts the grinding sheet (7) for grinding; Step S3, the hydraulic pressure of the external hydraulic pump controls the pressure between the welcome pedal and the grinding plate (7), thereby controlling the grinding force. When the grinding force is the maximum, the process proceeds to step S4, otherwise, the process proceeds to step S5; Step S4, the pressure valve (16) is opened, the welcome pedal is rapidly lowered and is out of contact with the grinding sheet (7), and then the process proceeds to step S5; Step S5: the external hydraulic pump is reset, the motor (3) stops running, and the rough grinding is completed.

7. The method for using the surface processing and polishing equipment of the electric welcome pedal of an automobile according to claim 6, characterized in that: In the steps S2 and S3, Where, F is the hydraulic pressure of the external hydraulic pump, F max is the maximum hydraulic pressure of the external hydraulic pump, R is the surface roughness of the welcome pedal, R max The maximum surface roughness of the welcome pedal. The rougher the welcome pedal is, the greater the hydraulic pressure of the external hydraulic pump is, and the stronger the grinding force is.

8. The method for using the surface processing and polishing equipment for an electric car welcome pedal according to claim 7, characterized in that: In the steps S3 and S4, when R=R max When the pressure valve (16) is opened, the round rod (152) rotates, and the welcome pedal quickly descends through the placement block (12).

Images