Pneumatic conveying equipment for powder conveying

Abstract

The present invention relates to the technical field of pneumatic conveying equipment, and specifically to a pneumatic conveying equipment for powder conveying. The present invention includes an upper hopper, a silo connected to the upper hopper, and a conveying pipe connected to the silo; an anti-blocking component is provided on the conveying pipe; the anti-blocking component includes: an air pump, the air outlet of the air pump is respectively connected to the conveying pipe and the annular shell; when the air pump is ventilated, it blows air into the conveying pipe while causing the rolling ball to intermittently squeeze the vibrating element. The anti-blocking component of the present invention can, on the one hand, directly supply air through the air pump, so that the gas directly passes into the conveying pipe, thereby compensating for the kinetic energy loss caused by distance and turning, improving the airflow's carrying capacity for food powder, and reducing sedimentation and accumulation; on the other hand, it can continuously knock on the side wall of the conveying pipe through the vibrating element to reduce the food powder from adhering to the inner wall of the conveying pipe, thereby further improving the anti-blocking effect.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying equipment, and in particular to a pneumatic conveying equipment for powder conveying. Background Art

[0002] When a pneumatic conveying system transports food powder (such as flour), the high-pressure airflow generated by the high-pressure fan pushes the food powder over a long distance, and kinetic energy will be lost (especially when passing through the bends of the conveying pipe). As a result, a small amount of food powder will settle in the second half of the conveying pipe and accumulate in the conveying pipe, resulting in a loss of food powder transportation volume. Over time, it may also cause blockage in the conveying pipe, affecting the transportation of food powder.

[0003] For example, although the invention patent with publication number CN117886126B can prevent food powder from adhering to the bends of the pipeline, food powder may still accumulate at the bends due to kinetic energy loss during long-distance transportation.

[0004] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0005] The object of the present invention is to provide a pneumatic conveying device for powder conveying that can effectively solve the above technical problems.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0007] A pneumatic conveying device for conveying powders, comprising: an upper hopper, a silo connected to the upper hopper, and a conveying pipe connected to the silo; an anti-blocking component is provided on the conveying pipe;

[0008] The anti-blocking component includes: an air pump, the air outlet of the air pump is connected to the delivery pipe and the annular shell respectively; a roller inside the annular shell is installed with a ball, and a vibrating member is installed on the inner wall of the annular shell in a radially sliding manner;

[0009] When the air pump is ventilating, it blows air into the delivery pipe while causing the rolling ball to intermittently squeeze the vibrating member.

[0010] Furthermore, the vibrating member includes: a sliding rod slidably mounted on the annular shell, a rubber spring fixedly mounted on the outer wall of the annular shell, and a buffer bag mounted on the outer side of the rubber spring; the rubber spring is connected to the sliding rod.

[0011] Furthermore, the anti-leakage assembly includes: a leaked gas collection ring installed at the connection of the delivery pipeline, and a piston tube connected to the leaked gas collection ring;

[0012] A first piston is slidably mounted in the piston tube, and a first resetting member is connected between the first piston and the piston tube;

[0013] The piston tube is connected to the capsule.

[0014] Furthermore, the piston tube is connected to a first exhaust chamber, a wedge block is slidably installed near the bottom of the first exhaust chamber, a first telescopic block is also installed inside the first exhaust chamber, and a winding roller is rotatably installed inside the first exhaust chamber, and a warning tape is wrapped around the outer side of the winding roller along the circumferential direction;

[0015] The wedge block is used to retract the first telescopic block and unlock the winding roller.

[0016] Furthermore, the warning tape is connected to a counterweight.

[0017] Furthermore, a pressure relief sound-generating component is provided on the air outlet side of the first exhaust chamber.

[0018] Furthermore, the first exhaust chamber is connected to the second exhaust chamber, a second piston is slidably installed inside the second exhaust chamber, the second piston is connected to the first liquid outlet pipe, a second liquid outlet pipe is also provided on the side wall of the second piston, and the second liquid outlet pipe is located below the second piston; liquid is stored above the second piston, and when the second piston slides upward, the first liquid outlet pipe cooperates with the second liquid outlet pipe and gradually forms a flow channel.

[0019] Furthermore, the second exhaust chamber is connected to the third exhaust chamber, a third pressure relief hole is provided on the right side wall of the third exhaust chamber, and a micro switch is installed on the top of the third exhaust chamber.

[0020] Compared with the prior art, the present invention has the following beneficial effects: on the one hand, the anti-blocking component of the present invention can directly supply air through an air pump, so that the gas can directly pass into the conveying pipeline, thereby compensating for the kinetic energy loss caused by distance and turning, improving the airflow's carrying capacity for food powder, and reducing sedimentation and accumulation; on the other hand, the side wall of the conveying pipeline can be continuously knocked by a vibrating member to reduce the adhesion of food powder to the inner wall of the conveying pipeline, thereby further improving the anti-blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] Figure 1 This is a schematic diagram of a pneumatic conveying device for powder conveying according to the present invention;

[0023] Figure 2This is a schematic structural diagram of a pneumatic conveying device for powder conveying according to the present invention;

[0024] Figure 3 It is a schematic plan view of a pneumatic conveying device for powder conveying according to the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of an anti-leakage component of a pneumatic conveying device for powder conveying according to the present invention;

[0026] Figure 5 for Figure 4 A partial enlarged view of part A;

[0027] Figure 6 for Figure 4 A partial enlarged view of part B;

[0028] Figure 7 for Figure 3 A partial enlarged view of part C in the middle;

[0029] Figure 8 for Figure 7 Schematic diagram of the internal structure of the partial enlarged view of part D.

[0030] In the figure: 1. Hopper; 2. Silo; 21. Compressed air inlet; 22. Pressure equalizing port; 3. Conveying pipeline; 31. Pneumatic discharge valve; 32. Air pump; 33. Anti-blocking component; 331. Ring shell; 332. Rolling ball; 333. Vibrating element; 3331. Sliding rod; 3332. Rubber dome; 3333. Buffer bag; 4. Anti-leakage component; 401. Leakage gas collection ring; 402. Piston tube; 403. First piston; 404. First reset element; 405. First Pressure relief hole; 406, second reset member; 407, wedge-shaped block; 408, first telescopic block; 409, counterweight; 410, handle; 411, winding roller; 412, pressure relief sounding member; 413, second exhaust chamber; 414, second pressure relief hole; 415, third exhaust chamber; 416, micro switch; 417, second telescopic block; 418, third pressure relief hole; 419, fourth pressure relief hole; 420, first exhaust chamber; 421, warning tape; 422, second piston; 423, bladder. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0032] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] like Figures 1 to 8 As shown, the present invention is a pneumatic conveying device for powder conveying, comprising: an upper hopper 1, a silo 2 connected to the discharge end of the upper hopper 1, and the volume of the silo 2 is 0.75 cubic meters.

[0034] A compressed air inlet 21 is provided on the side wall of the silo 2, and the compressed air inlet 21 is connected to the air compressor. The air outlet of the air compressor can be equipped with an air filter and a pressure reducing valve to ensure the cleanliness of the air source and stable pressure. This device uses an air compressor to supply air to the compressed air inlet 21, and transports food powder through positive pressure dense phase fluidization pneumatic conveying to meet the powder output requirements of the system.

[0035] A pressure equalizing port 22 is provided in the middle and upper part of the side wall of the silo 2. During the unloading process, negative pressure is easily formed in the silo. The pressure equalizing port 22 can quickly replenish air to maintain the smooth falling of the food powder.

[0036] The discharge end of the silo 2 is connected to a conveying pipe 3; a pneumatic discharge valve 31 is provided on the conveying pipe 3. When the pneumatic discharge valve 31 is working, the cylinder drives the double-gate valve core to move up and down through the piston rod, thereby opening or closing the valve.

[0037] An air pump 32 is connected to the bend in the middle of the conveying pipe 3; the air outlet of the air pump 32 is connected to a three-way solenoid valve, through which compressed air is introduced into the conveying pipe 3 on the one hand, with the air supply direction being toward the starting point of the straight pipe section after the bend, and the three-way solenoid valve is connected to the anti-blocking component 33 on the other hand; the air pump 32 injects compressed air into the conveying pipe 3 (especially into the straight section after the bend to avoid direct impact on the conveying pipe 3), which can compensate for the kinetic energy loss caused by distance and turns, improve the airflow's carrying capacity for food powder, and reduce sedimentation and accumulation; intermittent air supply is controlled by the three-way solenoid valve (for example, a pulse frequency of 5 to 10 times per minute) to avoid energy waste caused by continuous air supply, and the pulse impact force generated can break up the accumulated food powder.

[0038] The anti-blocking component 33 includes: an annular shell 331, a rolling ball 332 rotatably mounted inside the annular shell 331; an air inlet and an exhaust hole are opened on the annular shell 331, the air inlet hole is connected to the three-way solenoid valve, and the exhaust hole is used for exhaust; a vibrating member 333 is radially slidably mounted on the inner wall of the annular shell 331; the vibrating member 333 is composed of at least a sliding rod 3331 slidably mounted on the annular shell 331, a rubber spring 3332 fixedly mounted on the outer wall of the annular shell 331, and a buffer bag 3333 mounted on the outer side of the rubber spring 3332. A return spring can also be set between the sliding rod 3331 and the annular shell 331 to facilitate the return of the sliding rod 3331; the rubber spring 3332 is connected to the end of the sliding rod 3331 outside the annular shell 331, and the end of the sliding rod 3331 inside the annular shell 331 is arc-shaped; when the air pump 32 is started, the gas is respectively introduced into the delivery pipe 3 and the anti-blocking component 33 from the three-way solenoid valve; the gas is introduced into the delivery pipe After passing through the pipe 3, it can not only make up for the kinetic energy loss, but also reduce the dust sedimentation and accumulation on the inner wall of the pipe; after the gas enters the anti-blocking component 33, the gas enters from the air inlet and is discharged from the exhaust hole. During this process, the gas drives the ball 332 to slide along the inner wall of the annular shell 331. During the sliding process of the ball 332, the arc surface of the sliding rod 3331 is intermittently squeezed, so that the sliding rod 3331 extends toward the outer wall of the annular shell 331. During the extension process, the sliding rod 3331 knocks on the conveying pipe 3, causing the food powder attached to the bent section of the conveying pipe 3 to fall due to vibration; the ball 332 can be set as one or more. When it is set as multiple, the two adjacent balls 332 must be provided with a connecting structure to keep them at a distance; the buffer bag 3333 can prevent the sliding rod 3331 from hard contact with the conveying pipe 3, thereby protecting the conveying pipe 3; the rubber spring piece 3332 protects the sliding rod 3331 on the one hand, and on the other hand, it can make the sliding rod 3331 shrink toward the inside of the annular shell 331.

[0039] During the manufacturing and installation, there are often micron-level or even larger out-of-roundness or misalignment between pipe flanges and pipe joints, which will cause the sealing surface to be subjected to excessive force (easily squeezed) or too little force (unable to be firmly pressed) at certain locations. When the sealing surface is unevenly pressurized, once a micro-crack is generated somewhere, air leakage will be concentrated. A simple static annular seal is difficult to compensate for this local deformation or wear in time. Then, the seals (such as rubber gaskets and polytetrafluoroethylene gaskets) at the connection of the conveying pipeline 3 are subjected to long-term erosion by air flow, friction by food powder particles (such as impact of food powder at the elbow) or ambient temperature fluctuations ( The pneumatic conveying system is also susceptible to wear grooves, elastic hardening or thermal deformation due to the influence of various factors (such as alternating hot and cold), resulting in a decrease in sealing performance. In addition, when the pneumatic conveying system is in operation, mechanical vibrations generated by air flow pulsation, high-speed impact of food powder on the pipe elbow or equipment vibration, and mechanical knocking of the anti-blocking component 33 will be transmitted to the connection through the rigid connection of the pipe. For a long time, it may resonate with the natural frequency of the pipe, further aggravate the vibration amplitude of the connection, and eventually lead to loosening of the bolts or micro-displacement of the flange interface, thereby causing air leakage. Therefore, the bending section of the conveying pipe 3 is also provided with an anti-leakage component 4.

[0040] The anti-leakage component 4 includes: a leakage gas collection ring wrapped around the connection of the conveying pipeline 3, the leakage gas collection ring 401 is annular; the gas outlet end of the leakage gas collection ring is connected to the piston tube 402; when a gas leak occurs, the leaked gas enters the leakage gas collection ring and is discharged into the piston tube 402 through the leakage gas collection ring.

[0041] A first piston 403 is slidably installed inside the piston tube 402, and a first reset member 404 is connected between the first piston 403 and the piston tube 402. The first reset member 404 is composed of telescopic rods connected to each other and a spring connecting the two telescopic rods. The first reset member 404 and the air inlet of the piston tube 402 are staggered in space to avoid affecting the air intake; an air outlet is provided on the air outlet side of the first piston 403, and the air outlet is connected to a sac 423. The sac 423 is annular and is coated on the outside of the leaking gas collection ring 401, and is used to block the gap at the connection of the delivery pipe 3 when it expands.

[0042] The piston tube 402 is provided with a first pressure relief hole 405 in the extension direction of the first piston 403. The first pressure relief hole 405 is connected to the first exhaust chamber 420. A wedge block 407 is slidably installed near the bottom of the first exhaust chamber 420. A second reset member 406 is connected between the wedge block 407 and the first exhaust chamber 420. The second reset member 406 is used to reset the wedge block 407.

[0043] A first telescopic block 408 is also installed inside the first exhaust chamber 420. The first telescopic block 408 can be extended and retracted in the horizontal direction, and the first telescopic block 408 is located on the extension stroke of the wedge block 407. When gas enters the first exhaust chamber 420 from the first pressure relief hole 405, the gas drives the wedge block 407 to slide upward. During the sliding process, the wedge block 407 contacts the first telescopic block 408, forcing the first telescopic block 408 to contract.

[0044] A winding roller 411 is also rotatably installed inside the first exhaust chamber 420. The winding roller 411 is located above the wedge block 407, and has a protrusion on the winding roller 411 that can abut against the first telescopic block 408. The first telescopic block 408 is used to abut against the protrusion when extended to limit the winding roller 411 so that the winding roller 411 can only rotate clockwise; when the first telescopic block 408 contracts, the winding roller 411 is unlocked and can rotate.

[0045] A warning tape 421 is wrapped circumferentially around the outer side of the winding roller 411, which serves as a warning when extended; a through hole is provided on the left side wall of the first exhaust chamber 420, and one end of the warning tape 421 passes through the through hole, and the end of the warning tape 421 passing through the through hole is connected to a counterweight 409, and the setting of the counterweight 409 can make the winding roller 411 extend out of the first exhaust chamber 420; a pressure relief sounding member 412 is provided on the right side wall of the first exhaust chamber 420, and the pressure relief sounding member 412 is used to relieve pressure and discharge the air in the first exhaust chamber 420 into the second exhaust chamber 413, the air inlet of the pressure relief sounding member 412 is larger than the air outlet, and a hole edge is provided at the air outlet. When the air flow hits the hole edge of the pressure relief sounding member 412, it causes the air column in the pressure relief sounding member 412 to vibrate and make a sound.

[0046] When a slight air leakage occurs, the gas flows into the piston tube 402 and drives the first piston 403 to slide along the inside of the piston tube 402. During the sliding process, part of the air flows into the sac 423, and the other part of the air flows into the first exhaust chamber 420; until the first piston 403 slides through the first pressure relief hole 405, the leaked gas flows into the first exhaust chamber 420 from the first pressure relief hole 405, and the gas in the piston tube 402 flows into the sac 423. As the first piston 403 slides, the sac 423 gradually expands, and the air leakage gap is sealed during the expansion process of the sac 423. In addition, when the speed of the gas entering the first exhaust chamber 420 is greater than the exhaust speed of the pressure relief sounding piece 412, the air pressure drives the wedge block 407 to slide upward, and the wedge block During the sliding process of 407, the first telescopic block 408 is squeezed to separate the first telescopic block 408 from the winding roller 411. At this time, the counterweight 409 drives the warning tape 421 to extend from the first exhaust chamber 420, which can remind the staff that there is a gas leak here; at the same time, the gas flows into the pressure relief sound piece 412, causing the pressure relief sound piece 412 to make a sound, further reminding the staff; after the staff discovers and handles it, they turn the handle 410 to make the winding roller 411 rewind the warning tape 421; in this case, the amount of leakage is small and only the sac 423 is needed to temporarily block the leakage position. Combined with the warning tape 421 and the pressure relief sound piece 412, the staff can discover it in time when checking or passing by and carry out maintenance; the sac 423 and the piston tube 402 are provided with a one-way valve.

[0047] As an optional solution, a one-way valve is provided on the first piston 403, and the opening direction of the one-way valve is toward the first reset member 404; a baffle is fixedly provided on the left side of the first pressure relief hole 405, and an air inlet is opened on the baffle, and the air inlet has a structure protruding to the right. When the first piston 403 passes through the first pressure relief hole 405, the protruding structure abuts against the first piston 403, so that the leaked gas flows into the sac 423 on the one hand, and flows into the first exhaust chamber 420 on the other hand, providing an air source for the continuous expansion of the sac 423.

[0048] The air outlet end of the pressure relief sound member 412 is connected to the second exhaust chamber 413, and a second piston 422 is slidably installed inside the second exhaust chamber 413. The second piston 422 is connected to the first liquid outlet pipe, and a second liquid outlet pipe is also provided on the side wall of the second piston 422, and the second liquid outlet pipe is located below the second piston 422; liquid is stored above the second piston 422, and the second piston 422 is in a lower position due to the action of liquid pressure under normal conditions. At this time, the first liquid outlet pipe and the second liquid outlet pipe are staggered, and a second pressure relief hole 414 is opened on the right side wall of the second exhaust chamber 413, and the second pressure relief hole 414 is connected to the third exhaust chamber 415.

[0049] When there is a moderate leakage, the sac 423 may be difficult to block the gap at the pipe connection (that is, although the sac 423 is expanded, gas may still leak out and it is difficult to completely block the leakage). The speed at which gas flows into the second exhaust chamber 413 is faster than the speed at which gas is discharged from the second pressure relief hole 414. At this time, the gas pressure accumulates at the bottom of the second piston 422 until the second piston 422 is pushed upward, so that the first liquid outlet pipe is connected to the second liquid outlet pipe. When the second piston 422 moves upward to the maximum stroke When the first liquid outlet pipe is fully connected with the second liquid outlet pipe, the liquid is discharged from the second exhaust chamber 413 into the capsule 423, further providing support for the capsule 423; a one-way valve is arranged between the first liquid outlet pipe and the second liquid outlet pipe; the capsule 423 can be set as a double-cavity capsule having a gas storage space located on the inner side and a liquid storage space located on the outer side of the gas storage space, wherein the gas capsule is for emergency plugging and low-pressure scenarios and can be quickly sealed, while the liquid capsule is more suitable for medium and high pressure and high flow rate, and is more conducive to stable sealing.

[0050] The second pressure relief hole 414 is connected to a third exhaust chamber 415 . A third pressure relief hole 418 is provided on the right side wall of the third exhaust chamber 415 . A micro switch 416 is installed on the top of the third exhaust chamber 415 .

[0051] When a large amount of gas leaks, the gas leakage speed is greater than the exhaust speed of the third pressure relief hole 418. The gas pressure drives the second telescopic block 417 to slide upward and contact the micro switch 416. After the micro switch 416 is triggered, the system reduces the fan speed to a preset speed, thereby reducing the gas leakage speed, and starts the buzzer. The remote alarm reminds the staff to rush to the scene for emergency repairs quickly, and continue to temporarily block the pipeline gap through the bag 423, so that timely repairs can be carried out without stopping the machine.

[0052] A dust bag may be provided at the air outlet end of the third pressure relief hole 418 to collect leaked food powder; a fourth pressure relief hole 419 may also be provided on the side wall of the third exhaust chamber 415 located above the second telescopic block 417 for pressure relief.

[0053] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0054] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A pneumatic conveying device for powder conveying, comprising: An upper hopper (1), a silo (2) connected to the upper hopper (1), and a conveying pipe (3) connected to the silo (2); characterized in that an anti-blocking component (33) is provided on the conveying pipe (3); The anti-blocking component (33) comprises an air pump (32), the air outlet end of the air pump (32) being in communication with the delivery pipe (3) and the annular housing (331), respectively; a roller inside the annular housing (331) is provided with a rolling ball (332), and a vibrating member (333) is radially slidably provided on the inner wall of the annular housing (331); When the air pump (32) is ventilated, it blows air into the delivery pipe (3) while causing the rolling ball (332) to intermittently squeeze the vibrating member (333); The anti-leakage component (4) comprises: a leaked gas collection ring (401) installed at the connection of the delivery pipeline (3), and a piston tube (402) connected to the leaked gas collection ring (401); A first piston (403) is slidably mounted in the piston tube (402), and a first resetting member (404) is connected between the first piston (403) and the piston tube (402); The piston tube (402) is connected to a capsule (423); The piston tube (402) is connected to a first exhaust chamber (420), a wedge block (407) is slidably installed near the bottom of the first exhaust chamber (420), a first telescopic block (408) is also installed inside the first exhaust chamber (420), and a winding roller (411) is rotatably installed inside the first exhaust chamber (420), and a warning tape (421) is wound around the outer side of the winding roller (411) along the circumferential direction; The wedge block (407) is used to retract the first telescopic block (408) and unlock the winding roller (411); The warning belt (421) is connected to a counterweight (409); A pressure relief sound generating member (412) is provided on the gas outlet side of the first gas exhaust chamber (420); The first exhaust chamber (420) is connected to the second exhaust chamber (413), a second piston (422) is slidably mounted inside the second exhaust chamber (413), a first liquid outlet pipe is connected to the second piston (422), a second liquid outlet pipe is further provided on the side wall of the second piston (422), and the second liquid outlet pipe is located below the second piston (422); liquid is stored above the second piston (422), and when the second piston (422) slides upward, the first liquid outlet pipe cooperates with the second liquid outlet pipe to gradually form a flow channel; The second exhaust chamber (413) is connected to the third exhaust chamber (415), a third pressure relief hole (418) is provided on the right side wall of the third exhaust chamber (415), and a micro switch (416) is installed on the top of the third exhaust chamber (415).

2. A pneumatic conveying device for powder conveying according to claim 1, characterized in that: The vibrating member (333) comprises: a sliding rod (3331) slidably mounted on the annular housing (331), a rubber spring (3332) fixedly mounted on the outer wall of the annular housing (331), and a buffer bag (3333) mounted on the outer side of the rubber spring (3332); the rubber spring (3332) is connected to the sliding rod (3331).

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