Dust falling device for quartz stone plate production and processing

Abstract

The application discloses a dust falling device for quartz stone plate production and processing, and relates to the technical field of filtering equipment.The dust falling device comprises a machine body, a screw conveyor fixedly connected to the opening at the bottom of the machine body, an air inlet pipe fixedly connected to the side of the machine body, a water inlet pipe rotatably connected to the top surface of the machine body, and a nozzle fixedly connected to the tail end of the water inlet pipe.The dust-containing gas is introduced into the machine body through the air inlet pipe, and the nozzle is driven to revolve in the machine body by a driving mechanism.The nozzle can be matched with an adjusting mechanism when revolving.The flow of the nozzle is increased when the nozzle moves close to the air inlet pipe, and the flow of the nozzle is decreased when the nozzle moves away from the air inlet pipe, thereby saving water resources.The nozzle is in contact with the rotating sponge when revolving, so that the hole below the nozzle is cleaned by the sponge, and the nozzle is prevented from being blocked by the caked dust.

Description

Technical Field

[0001] This invention relates to the field of filtration equipment technology, and in particular to a dust suppression device for the production and processing of quartz stone slabs. Background Technology

[0002] Quartz stone slabs are a type of artificial stone, mainly made of more than 90% quartz crystals mixed with resin and pressed together. They are wear-resistant, high-temperature resistant, and radiation-free, and are widely used in kitchen countertops, bathrooms, and wall decorations. They are generally processed into slabs for use. Quartz stone slabs need to go through processes such as cutting and polishing during production and processing. In these processes, dust suppression devices are needed to purify the fumes generated during processing.

[0003] Most existing dust suppression devices spray water mist through rotatable nozzles to ensure that the dust in the dust-laden gas can come into uniform contact with the dust. However, when using this method, the flow rate of the nozzle is constant, but after the dust-laden gas enters the device through the pipe, the dust concentration in different parts of the device is different. The dust concentration is high near the air inlet pipe and low in the part far from the air inlet pipe. This results in a certain amount of waste when the nozzle sprays water mist in the part with low dust concentration. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing dust suppression devices for the production and processing of quartz stone slabs, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to control the flow rate of the nozzle according to the dust concentration inside the dust suppression device.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dust suppression device for the production and processing of quartz stone slabs, comprising a body with an auger fixedly connected to the opening at its bottom, an air inlet pipe fixedly connected to the side of the body, a water inlet pipe rotatably connected to the top surface of the body, a nozzle fixedly connected to the end of the water inlet pipe, the water inlet pipe driving multiple nozzles to revolve inside the body, a sleeve fixedly installed at the top of the inner cavity of the body, and an adjustment mechanism connected between the nozzle and the sleeve, the adjustment mechanism being used to adjust the flow rate in the nozzle according to the dust concentration inside the body; the adjustment mechanism includes an inner tube vertically slidably connected inside the nozzle, a bottom through hole opened at the bottom of the inner tube, and a side through hole opened at the side of the inner tube and fitting against the inner wall of the nozzle, the inner tube driving the side through hole to move vertically, thereby controlling the flow of the nozzle by controlling the conduction of the side through hole.

[0008] As a preferred embodiment of the dust suppression device for quartz stone slab production and processing described in this invention, the adjusting mechanism further includes a limiting groove vertically opened on the side of the nozzle, a limiting block fixedly installed on the inner tube and slidably connected to the inside of the limiting groove, a guide block fixedly installed on the limiting block, a first groove segment, a second groove segment, and a third groove segment opened on the inner wall of the sleeve, the two ends of the first groove segment respectively connected to the two second groove segments, the other ends of the two second groove segments respectively connected to the two ends of the third groove segment, and the guide block slidably connected to the inside of the first groove segment, the second groove segment, and the third groove segment.

[0009] In a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, the horizontal height of the first trough section is lower than that of the third trough section, and the projection of the second trough section on the vertical plane is an inclined line segment, which connects the first trough section and the third trough section.

[0010] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, it further includes a drive mechanism, which includes: a motor, fixedly installed on the top of the machine body; a first gear, coaxially fixedly installed on the water inlet pipe; and a second gear, keyed to the output end of the motor and meshing with the first gear.

[0011] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, it further includes a sealing ring, which is coaxially fitted on the outer wall of the inner tube, and the outer wall of the sealing ring is in contact with the inner wall of the nozzle.

[0012] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, wherein: an exhaust pipe is fixedly connected to the side of the machine body, a housing is installed on the side of the machine body, one end of the exhaust pipe is connected to the inside of the housing, a turbine is rotatably connected inside the housing, and the turbine is connected to a first cleaning mechanism or a second cleaning mechanism, both of which are used to clean the water outlet of the nozzle.

[0013] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, the first cleaning mechanism includes: a first rotating shaft, fixedly connected to the turbine, and a first sponge, fixedly installed on the first rotating shaft and located below the nozzle.

[0014] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, the second cleaning mechanism includes: a second rotating shaft fixedly connected to the turbine, a central rod rotatably connected to one end of the second rotating shaft, a base plate slidably connected to the central rod in the radial direction, and a second sponge fixedly installed on the base plate.

[0015] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, the second cleaning mechanism further includes: a guide groove formed on the second rotating shaft, a sliding groove formed on the central rod, and a traction rod, one end of which is elastically connected to the base plate by a torsion spring, and the other end of which passes through the sliding groove and is slidably connected inside the guide groove.

[0016] As a preferred embodiment of the dust suppression device for the production and processing of quartz stone slabs according to the present invention, the second cleaning mechanism further includes: a third gear fixedly connected to the base plate, and a rack fixedly installed on the central rod and cooperating with the third gear.

[0017] The beneficial effects of this invention are: This invention introduces dust-laden gas into the machine body through an air inlet pipe. A drive mechanism drives the nozzle to revolve inside the machine body. During the revolve, the nozzle can cooperate with an adjustment mechanism. When the nozzle moves close to the air inlet pipe, the adjustment mechanism increases the flow rate of the nozzle. When the nozzle moves away from the air inlet pipe, the adjustment mechanism decreases the flow rate of the nozzle, thereby saving water resources. Furthermore, as the nozzle revolves, it comes into contact with a rotating sponge to clean the holes below the nozzle and prevent the nozzle from being blocked by clumps of dust. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure of a dust suppression device for the production and processing of quartz stone slabs.

[0020] Figure 2 This is a schematic diagram of the internal structure of a dust suppression device used in the production and processing of quartz stone slabs.

[0021] Figure 3 This is a schematic diagram of the main structure of the nozzle in a dust suppression device used in the production and processing of quartz stone slabs.

[0022] Figure 4 This is a cross-sectional structural diagram of the sleeve in a dust suppression device for the production and processing of quartz stone slabs.

[0023] Figure 5 This is a schematic diagram of the internal structure of a nozzle in a dust suppression device used in the production and processing of quartz stone slabs.

[0024] Figure 6 This is a schematic diagram of the main structure of the first cleaning mechanism in Embodiment 1 of a dust suppression device for the production and processing of quartz stone slabs.

[0025] Figure 7 This is a schematic diagram of the main structure of the drive mechanism in a dust suppression device for the production and processing of quartz stone slabs.

[0026] Figure 8 This is a schematic diagram of the main structure of the second cleaning mechanism in Embodiment 3 of a dust suppression device for the production and processing of quartz stone slabs.

[0027] Figure 9 This is a schematic diagram of the connection structure between the second rotating shaft and the substrate in Embodiment 3 of a dust suppression device for the production and processing of quartz stone slabs.

[0028] Figure 10 This is a schematic diagram of the connection structure between the traction rod and the substrate in Embodiment 3 of a dust suppression device for the production and processing of quartz stone slabs.

[0029] In the diagram: 1. Body; 2. Screwdriver; 3. Air inlet pipe; 4. Water inlet pipe; 5. Exhaust pipe; 6. Drive mechanism; 61. Motor; 62. First gear; 63. Second gear; 7. First cleaning mechanism; 71. First rotating shaft; 72. First sponge; 8. Nozzle; 9. Sleeve; 10. Adjustment mechanism; 101. First groove section; 102. Second groove section; 103. Third groove section; 104. Guide block; 105. Limiting... 106. Positioning block; 107. Limiting groove; 108. Inner tube; 109. Bottom through hole; 100. Side through hole; 11. Sealing ring; 12. Second cleaning mechanism; 121. Second rotating shaft; 122. Base plate; 123. Second sponge; 124. Center rod; 125. Guide groove; 126. Traction rod; 127. Slide groove; 128. Third gear; 129. Rack; 13. Torsion spring; 14. Housing; 15. Turbine. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, referring to Figures 1 to 3This is the first embodiment of the present invention, which provides a dust suppression device for the production and processing of quartz stone slabs. The device includes a body 1 with a screw conveyor 2 fixedly connected to its bottom opening, an air inlet pipe 3 fixedly connected to the side of the body 1, a water inlet pipe 4 rotatably connected to the top surface of the body 1, nozzles 8 fixedly connected to the end of the water inlet pipe 4, the water inlet pipe 4 driving multiple nozzles 8 to revolve inside the body 1, a sleeve 9 fixedly installed at the top of the inner cavity of the body 1, and an adjustment mechanism 10 connected between the nozzles 8 and the sleeve 9. The adjustment mechanism 10 is used to adjust the flow rate of the nozzles 8 according to the dust concentration inside the body 1. The adjustment mechanism 10 includes an inner tube 107 vertically slidably connected inside the nozzles 8, a bottom through hole 108 opened at the bottom of the inner tube 107, and a side through hole 109 opened on the side of the inner tube 107 and fitted against the inner wall of the nozzles 8. The inner tube 107 drives the side through hole 109 to move vertically, thereby adjusting the flow rate of the nozzles 8 by controlling the opening of the side through hole 109.

[0034] Please see Figures 1 to 3 When the inner tube 107 is driven to move vertically, the position of the side through hole 109 relative to the inner wall of the nozzle 8 changes. When the inner tube 107 descends to a specific position, the side through hole 109 is unblocked by the inner wall of the nozzle 8 and becomes open, allowing water to spray out from both the bottom through hole 108 and the side through hole 109 simultaneously, increasing the flow rate. After rising and resetting, the side through hole 109 is closed by the inner wall of the nozzle 8, and only the bottom through hole 108 outputs water, reducing the flow rate. When the nozzle 8 revolves, the adjusting mechanism 10 automatically changes the height of the inner tube 107 according to the regional differences in dust concentration inside the machine body 1 through the guiding action of the sleeve 9. In the high concentration area near the air inlet pipe 3, the side through hole 109 is opened to increase the spray volume for efficient dust reduction. In the low concentration area far from the air inlet pipe 3, the side through hole 109 is closed to reduce the flow rate and avoid waste. After the dust settles inside the machine body 1, it falls to the bottom of the machine body 1 to form mud, which eventually enters the auger 2 for conveying.

[0035] The adjustment mechanism 10 also includes a limiting groove 106, which is vertically opened on the side of the nozzle 8; a limiting block 105, which is fixedly installed on the inner tube 107 and slidably connected to the inside of the limiting groove 106; a guide block 104, which is fixedly installed on the limiting block 105; a first groove segment 101, a second groove segment 102, and a third groove segment 103, which are opened on the inner wall of the sleeve 9; the two ends of the first groove segment 101 are respectively connected to the two second groove segments 102; the other ends of the two second groove segments 102 are connected to the two ends of the third groove segment 103; the guide block 104 is slidably connected to the inside of the first groove segment 101, the second groove segment 102, and the third groove segment 103; the horizontal height of the first groove segment 101 is lower than the horizontal height of the third groove segment 103; the projection of the second groove segment 102 on the vertical plane is an inclined line segment, which connects the first groove segment 101 and the third groove segment 103.

[0036] Please see Figure 4 and Figure 5 When the water inlet pipe 4 drives the nozzle 8 to revolve, the guide block 104 slides along the track formed by the first groove 101, the second groove 102, and the third groove 103. Due to the design differences in the depth or position of the first groove 101, the second groove 102, and the third groove 103 in the vertical direction, the guide block 104 will move up and down during the sliding along the track, and the limit block 105 will force the inner tube 107 to rise and fall synchronously. Corresponding to the high dust concentration area near the air inlet pipe 3, the sleeve 9 is provided with the first groove 101, which can lower the inner tube 107 and open the side through hole 109. Corresponding to the low concentration area far away from the air inlet pipe 3, the third groove 103 is provided, which can raise the inner tube 107 and close the side through hole 109. The second groove 102 is used for rising and falling.

[0037] Example 2, please refer to Figure 6 and Figure 7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] It also includes a drive mechanism 6, which includes: a motor 61, fixedly mounted on the top of the body 1; a first gear 62, coaxially fixedly mounted on the water inlet pipe 4; and a second gear 63, keyed to the output end of the motor 61 and meshing with the first gear 62.

[0039] Specifically, after the motor 61 starts, it drives the first gear 62 to rotate through the second gear 63, which in turn drives the water inlet pipe 4 to rotate around its own axis. Since the nozzle 8 is fixedly connected to the end of the water inlet pipe 4, the rotation of the water inlet pipe 4 is directly converted into the revolution of multiple nozzles 8 inside the machine body 1. Through the simple combination of the gear set formed by the motor 61, the first gear 62, and the second gear 63, the reliability of the revolution is ensured, providing a power basis for the entire structure to dynamically adjust the flow rate of the nozzles 8 according to the dust concentration.

[0040] It also includes a sealing ring 11, which is coaxially fitted on the outer wall of the inner tube 107, and the outer wall of the sealing ring 11 is in contact with the inner wall of the nozzle 8.

[0041] Specifically, the sealing ring 11 has a certain degree of elasticity, which allows the inner tube 107 to slide smoothly relative to each other while ensuring the sealing effect, without excessively increasing the resistance and affecting the movement of the guide block 104 in the track on the inner wall of the sleeve 9.

[0042] An exhaust pipe 5 is fixedly connected to the side of the body 1. A housing 14 is installed on the side of the body 1. One end of the exhaust pipe 5 is connected to the inside of the housing 14. A turbine 15 is rotatably connected inside the housing 14. The turbine 15 is connected to a first cleaning mechanism 7. The first cleaning mechanism 7 is used to clean the water outlet of the nozzle 8. The first cleaning mechanism 7 includes: a first rotating shaft 71, which is fixedly connected to the turbine 15, and a first sponge 72, which is fixedly installed on the first rotating shaft 71 and located below the nozzle 8.

[0043] Specifically, when the purified gas enters the housing 14 from the exhaust pipe 5 and drives the turbine 15 to rotate, the first rotating shaft 71 drives the first sponge 72 to rotate. Since the first sponge 72 is located below the nozzle 8, it will repeatedly wipe the end face of the water outlet of the nozzle 8 above it during its rotation, scraping off and adsorbing the attached or stuck dust particles.

[0044] It should be noted that in high-concentration areas, nozzle 8 sprays at a high flow rate, resulting in high water droplet kinetic energy and a certain degree of self-cleaning ability. However, sticky dust may still remain. In low-concentration areas, the water outlet of the low-flow spray is more easily clogged by fine dust. The continuous rotating wiping of the first sponge 72 ensures that the water outlet is unobstructed regardless of whether nozzle 8 is in a high-flow or low-flow state, so that the accuracy of flow regulation is not reduced due to clogging.

[0045] Example 3, referring to Figures 8 to 10 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0046] The second cleaning mechanism 12 includes: a second rotating shaft 121 fixedly connected to the turbine 15; a central rod 124 rotatably connected to one end of the second rotating shaft 121; a base plate 122 slidably connected to the central rod 124 in a radial direction; a second sponge 123 fixedly mounted on the base plate 122; a guide groove 125 formed on the second rotating shaft 121; a sliding groove 127 formed on the central rod 124; a traction rod 126, one end of which is elastically connected to the base plate 122 via a torsion spring 13, and the other end of which passes through the sliding groove 127 and is slidably connected inside the guide groove 125; a third gear 128 fixedly connected to the base plate 122; and a rack 129 fixedly mounted on the central rod 124 and cooperating with the third gear 128.

[0047] Specifically, due to inertia, the turbine 15 can first drive the second rotating shaft 121 to rotate. The second rotating shaft 121 can then drive one end of the traction rod 126 to revolve through the arc-shaped guide groove 125, thereby causing the traction rod 126 to slide inside the slide groove 127. This allows the traction rod 126 to drive the substrate 122 to slide radially. When the traction rod 126 moves to its maximum stroke, the second rotating shaft 121 can drive the central rod 124 to rotate synchronously through the traction rod 126. At this time, the gap between the central rod 124 and the substrate 122 gradually increases.

[0048] Furthermore, as the substrate 122 moves radially, the traction rod 126 can drive the third gear 128 to move synchronously. At this time, the third gear 128 can cooperate with the rack 129, thereby causing the substrate 122 to drive the second sponge 123 to rotate 180 degrees. At the same time, the torsion spring 13 deforms and stores energy. With the continuous drive of the second rotating shaft 121, the substrate 122 always remains in an open state. Therefore, the distance between the substrate 122 and the nozzle 8 will decrease, thereby increasing the friction between the second sponge 123 and the nozzle 8, thus improving the cleaning effect on the nozzle 8.

[0049] After dust removal is completed, the machine body 1 is in a stopped state, the turbine 15 stops rotating, and the base plate 122 rotates in the opposite direction to reset under the action of the torsion spring 13, thereby driving the base plate 122 to reset radially. The distance between the base plate 122 and the center rod 124 is reduced to squeeze the second sponge 123 to remove excess moisture inside the second sponge 123 for subsequent reuse.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dust suppression device for the production and processing of quartz stone slabs, characterized in that: Includes a body (1), with an auger (2) fixedly connected to the opening at the bottom, an air inlet pipe (3) fixedly connected to the side of the body (1), a water inlet pipe (4) rotatably connected to the top surface of the body (1), a nozzle (8) fixedly connected to the end of the water inlet pipe (4), the water inlet pipe (4) driving multiple nozzles (8) to revolve inside the body (1), a sleeve (9) fixedly installed at the top of the inner cavity of the body (1), and an adjustment mechanism (10) connected between the nozzle (8) and the sleeve (9), the adjustment mechanism (10) being used to adjust the flow rate in the nozzle (8) according to the dust concentration inside the body (1); The adjustment mechanism (10) includes an inner tube (107) that is vertically slidably connected inside the nozzle (8), a bottom through hole (108) that is opened at the bottom of the inner tube (107), and a side through hole (109) that is opened on the side of the inner tube (107) and fits against the inner wall of the nozzle (8). The inner tube (107) drives the side through hole (109) to move vertically so as to adjust the flow rate of the nozzle (8) by controlling the opening of the side through hole (109).

2. The dust suppression device for quartz stone slab production and processing according to claim 1, characterized in that: The adjustment mechanism (10) further includes a limiting groove (106) vertically opened on the side of the nozzle (8), a limiting block (105) fixedly installed on the inner tube (107) and slidably connected to the inside of the limiting groove (106), a guide block (104) fixedly installed on the limiting block (105), a first groove segment (101), a second groove segment (102) and a third groove segment (103) opened on the inner wall of the sleeve (9), the two ends of the first groove segment (101) are respectively connected to the two second groove segments (102), the other ends of the two second groove segments (102) are connected to the two ends of the third groove segment (103), and the guide block (104) is slidably connected to the inside of the first groove segment (101), the second groove segment (102) and the third groove segment (103).

3. The dust suppression device for quartz stone slab production and processing according to claim 2, characterized in that: The horizontal height of the first groove segment (101) is lower than that of the third groove segment (103). The projection of the second groove segment (102) on the vertical plane is an inclined line segment, which connects the first groove segment (101) and the third groove segment (103).

4. A dust suppression device for the production and processing of quartz stone slabs according to any one of claims 1-3, characterized in that: It also includes a drive mechanism (6), which includes: a motor (61) fixedly mounted on the top of the body (1), a first gear (62) coaxially fixedly mounted on the water inlet pipe (4), and a second gear (63) keyed to the output end of the motor (61) and meshing with the first gear (62).

5. A dust suppression device for the production and processing of quartz stone slabs according to any one of claims 1-3, characterized in that: It also includes a sealing ring (11), which is coaxially fitted on the outer wall of the inner tube (107), and the outer wall of the sealing ring (11) is in contact with the inner wall of the nozzle (8).

6. A dust suppression device for the production and processing of quartz stone slabs according to any one of claims 1-3, characterized in that: An exhaust pipe (5) is fixedly connected to the side of the body (1). A housing (14) is installed on the side of the body (1). One end of the exhaust pipe (5) is connected to the inside of the housing (14). A turbine (15) is rotatably connected inside the housing (14). The turbine (15) is connected to a first cleaning mechanism (7) or a second cleaning mechanism (12). Both the first cleaning mechanism (7) and the second cleaning mechanism (12) are used to clean the water outlet of the nozzle (8).

7. A dust suppression device for the production and processing of quartz stone slabs according to claim 6, characterized in that: The first cleaning mechanism (7) includes: a first rotating shaft (71) fixedly connected to the turbine (15), and a first sponge (72) fixedly mounted on the first rotating shaft (71) and located below the nozzle (8).

8. A dust suppression device for the production and processing of quartz stone slabs according to claim 6, characterized in that: The second cleaning mechanism (12) includes: a second rotating shaft (121) fixedly connected to the turbine (15), a central rod (124) rotatably connected to one end of the second rotating shaft (121), a base plate (122) slidably connected to the central rod (124) in the radial direction, and a second sponge (123) fixedly mounted on the base plate (122).

9. A dust suppression device for the production and processing of quartz stone slabs according to claim 8, characterized in that: The second cleaning mechanism (12) further includes: a guide groove (125) opened on the second rotating shaft (121), a slide groove (127) opened on the central rod (124), and a traction rod (126), one end of which is elastically connected to the base plate (122) by a torsion spring (13), and the other end passes through the slide groove (127) and is slidably connected inside the guide groove (125).

10. A dust suppression device for the production and processing of quartz stone slabs according to claim 9, characterized in that: The second cleaning mechanism (12) further includes: a third gear (128) fixedly connected to the base plate (122), and a rack (129) fixedly mounted on the central rod (124) and cooperating with the third gear (128).

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