Straw recycling, transferring and storing equipment

Abstract

The straw recycling, transferring and storing equipment comprises a primary crushing box, two saw pressing rollers corresponding to material pressing rollers are arranged in the primary crushing box, and servo motors for driving the saw pressing rollers to rotate are arranged at the ends of the two saw pressing rollers correspondingly; the side, away from the servo motor, of the primary crushing box is fixedly connected with two reciprocating push rods moving in the opposite directions through a support, and the telescopic ends of the two reciprocating push rods are rotationally connected to the rotating ends of the two saw pressing rollers through connecting bearings correspondingly. The two servo motors work to drive the two saw pressing rollers to move in an engaged mode so that straw can be crushed, the two saw pressing rollers can be driven to move in a reciprocating mode in cooperation with the two reciprocating push rods in the reverse direction so that the straw not prone to breakage can be sawed off, and compared with the prior art, the straw crushing device is good in straw crushing effect and high in practicability. The efficiency is high, and blockage in the subsequent straw treatment process is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of straw recycling, in particular to a straw recycling transfer storage device. Background Art

[0002] Straw refers to the stem and leaf parts of gramineous crops (such as rice, wheat, corn, etc.) that remain after threshing. In China, straw is usually called straw grass, of which rice straw is called rice straw or rice straw, and wheat straw is called wheat straw. In recent years, in order to effectively utilize straw resources and reduce environmental pollution, the Chinese government and scientific research institutions have actively explored new ways to comprehensively utilize straw.

[0003] Through searching, CN219913866U was found, which discloses a straw recycling, transfer and storage device, including a mobile base, a box, a cutting assembly, a hot air blower and a control box. A feed port is provided at the upper left end of the box, and the cutting assembly is arranged in the feed port. A hydraulic rod is provided on the left side of the outside of the box, and the telescopic end of the hydraulic rod is passed through the interior of the box and fixedly connected with a push plate. The hot air blower is connected with the second drying chamber and the storage chamber respectively through pipelines. The drying efficiency is ensured by the two-stage drying of the first and second drying chambers, and the storage space is increased by pushing and squeezing by the push plate.

[0004] The existing technology cuts the straw through a cutting assembly. Since the straw contains a large amount of cellulose and lignin, these substances make the straw have high toughness and tensile strength. Cellulose and lignin are intertwined to form a complex mesh structure, which makes it difficult for the existing technology to effectively cut the straw only through the bite-type movement of the first roller and the second roller. If the straw is not cut thoroughly, it is easy to get blocked in the drying chamber, causing the equipment to fail to operate normally. Therefore, I urgently need a straw recycling transfer storage device that can effectively cut the straw and can perform efficient drying. Summary of the invention

[0005] The object of the present invention is to provide a straw recycling transfer storage device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a straw recycling and transfer storage device, comprising a primary crushing box, wherein two pressing rollers are rotatably connected inside the primary crushing box, and a gap is left between the two pressing rollers, a feeding window facing the middle position of the two pressing rollers is fixedly connected to the surface of the primary crushing box, two saw rollers corresponding to the pressing rollers are arranged inside the primary crushing box, and servo motors for driving the saw rollers to rotate are arranged at the ends of the two saw rollers, and motor brackets are fixedly connected to the outsides of the servo motors, two limit slide bars parallel to the axis of the saw rollers are fixedly connected to the inner wall of the primary crushing box, and the motor bracket is slidably connected to the outside of the limit slide bars, two reciprocating push rods moving in opposite directions are fixedly connected to the side of the primary crushing box away from the servo motor through the bracket, and the telescopic ends of the two reciprocating push rods are respectively rotatably connected to the rotating ends of the two saw rollers through connecting bearings, a feeding pipe is fixedly connected to the lower surface of the primary crushing box, a crushing and drying mechanism is arranged at the lower end of the feeding pipe, a discharging pipe is fixedly connected to the lower end of the crushing and drying mechanism, and a straw storage box is arranged at the lower end of the discharging pipe.

[0007] Preferably, the sawing roller comprises a roller body and a plurality of sawtooth blades, the plurality of sawtooth blades are fixedly connected to the outer surface of the roller body in an annular array, and the sawtooth blades on the surfaces of two sawing rollers are meshed with each other.

[0008] Preferably, a straw transition platform is fixedly connected to the inner bottom of the primary crushing box, and the upper surface of the straw transition platform is lower than the gap height between the two pressing rollers.

[0009] Preferably, a first annular electric heating plate is fixedly connected to the interior of the nip roller.

[0010] Preferably, a stepper motor is fixedly connected to the inner wall of the primary crushing box, and the output end of the stepper motor is fixedly connected to the rotating shaft of one of the pressure rollers, the outer surfaces of the rotating shafts of the two pressure rollers are fixedly connected to transmission gears, and the two transmission gears are meshed with each other.

[0011] Preferably, the crushing and drying mechanism includes a U-shaped shell, two second annular electric heating plates, a crushing and stirring rod, a spiral auger, an exhaust cover and a hot air blower. The two second annular electric heating plates are respectively fixedly connected to the upper and lower inner walls of the U-shaped shell, the crushing and stirring rod and the spiral auger are both rotatably connected to the inner side of the U-shaped shell, the hot air blower is fixedly connected to the upper right side of the U-shaped shell, and the exhaust cover is fixedly connected to the lower right side of the U-shaped shell.

[0012] Preferably, the crushing and stirring rod and the left end of the spiral auger are both transmission-connected with pulleys, the outer surfaces of the two pulleys are jointly covered with a transmission belt, the left side of the straw storage box is fixedly connected to a support platform, the surface of the support platform is fixedly connected to a power motor, and the output end of the power motor is transmission-connected to the pulley.

[0013] Preferably, a hydraulic push rod is fixedly connected to the inner wall of the straw storage box, a right-angle pressing plate is fixedly connected to the end of the hydraulic push rod, and the right-angle pressing plate is slidably connected to the inner wall of the straw storage box.

[0014] Preferably, a discharge window is provided at the right end of the straw storage box, a limiting groove is provided on the inner wall of the discharge window, and a door panel for blocking the discharge window is slidably connected in the limiting groove.

[0015] Preferably, two sleeves are embedded and fixed on the outer surface of the primary crushing box, and two reciprocating push rods are slidably connected to the two sleeves. The outer surfaces of the reciprocating push rods are fixedly connected to pistons, and a first one-way valve is provided on the right surface of the sleeve, and a second one-way valve is provided on the surface of the piston.

[0016] Beneficial Effects

[0017] The present invention provides a straw recycling transfer storage device, which has the following beneficial effects:

[0018] 1. The straw recycling and transfer storage device can flatten the straw through the rotation of two pressing rollers, so as to facilitate subsequent cutting. The two servo motors can drive the two pressing saw rollers to form a bite-type motion, so as to crush the straw, and cooperate with the two reciprocating push rods to perform reverse motion, which can drive the two pressing saw rollers to reciprocate in the opposite direction, so as to saw off the straw that is not easy to break. Compared with the existing technology, the device has a good straw crushing effect and high efficiency, and effectively avoids blockage in the subsequent straw processing process.

[0019] 2. The straw recycling and transfer storage equipment can heat the pressing roller by setting a first annular electric heating plate, so that the straw can be preliminarily heated in the process of flattening the straw to remove moisture from the straw. The straw in the U-shaped shell can be crushed again by the drying and crushing mechanism and the rotation of the crushing and stirring rod. The crushed straw can be air-dried by a hot air blower and blown from the upper end to the lower end of the U-shaped shell. The crushed straw can be turned over by the rotation of the spiral auger. The drying effect of the straw can be improved by two second annular electric heating plates. The equipment can greatly improve the drying efficiency of the straw, thereby effectively improving the straw storage efficiency, and greatly reducing the probability of the straw being damp, moldy and damaged.

[0020] 3. The straw recycling and transfer storage equipment is provided with a sleeve, a piston and a first one-way valve and a second one-way valve. When the reciprocating push rod reciprocates, it can drive the piston to reciprocate in the sleeve. The first one-way valve and the second one-way valve control the direction of air flow. The moisture in the primary crushing box can be drawn into the sleeve and discharged from the primary crushing box. Compared with the existing technology, during the process of drying the straw, moisture is not easy to accumulate inside the equipment, thereby further improving the straw drying effect and being beneficial to the subsequent storage of straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a straw recycling transfer storage device proposed by the present invention;

[0022] Figure 2 A schematic diagram of the internal structure of a primary crushing box of a straw recycling transfer storage device proposed by the present invention;

[0023] Figure 3 A schematic diagram of the three-dimensional structure of a saw press roller of a straw recycling transfer storage device proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of a sleeve of a straw recycling transfer storage device proposed by the present invention;

[0025] Figure 5 A straw recycling and transfer storage device proposed by the present invention Figure 4 A is a schematic diagram of the enlarged structure;

[0026] Figure 6 A schematic cross-sectional view of a crushing and drying mechanism and a straw storage box of a straw recycling transfer storage device proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the left-side section structure of a U-shaped shell of a straw recycling transfer and storage device proposed in the present invention.

[0028] In the figure: 1. primary crushing box; 2. pressing roller; 3. feeding window; 4. pressing saw roller; 5. servo motor; 6. motor bracket; 7. limit slide bar; 8. reciprocating push rod; 9. feeding pipe; 10. discharging pipe; 11. straw storage box; 12. roller body; 13. serrated blade; 14. straw transition table; 15. first annular electric heating plate; 16. stepping motor; 17. transmission gear; 18. U-shaped shell; 19. second annular electric heating plate; 20. crushing stirring rod; 21. spiral auger; 22. exhaust cover; 23. hot air blower; 24. pulley; 25. transmission belt; 26. support table; 27. power motor; 28. hydraulic push rod; 29. ​​right angle pressure plate; 30. discharging window; 31. limit groove; 32. door panel; 33. sleeve; 34. piston; 35. first one-way valve; 36. second one-way valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0030] Example 1, please refer to Figure 1-7The present invention provides a technical solution: a straw recycling transfer storage device, comprising a primary crushing box 1, wherein two pressing rollers 2 are rotatably connected inside the primary crushing box 1, and a gap is left between the two pressing rollers 2, and a feeding window 3 facing the middle position of the two pressing rollers 2 is fixedly connected to the surface of the primary crushing box 1, two pressing saw rollers 4 corresponding to the pressing rollers 2 are arranged inside the primary crushing box 1, and the ends of the two pressing saw rollers 4 are provided with servo motors 5 for driving the pressing saw rollers 4 to rotate, and the outer sides of the servo motors 5 are fixedly connected with motor brackets 6, and the inner wall of the primary crushing box 1 is fixedly connected with two limit slide bars 7 parallel to the axis of the pressing saw rollers 4, and the motor bracket 6 is slidably connected to the outer side of the limit slide bar 7, and the side of the primary crushing box 1 away from the servo motor 5 is fixedly connected with two reciprocating push rods 8 moving in opposite directions through the bracket, and the telescopic ends of the two reciprocating push rods 8 are rotatably connected to the rotating ends of the two pressing saw rollers 4 through connecting bearings respectively. The lower surface of the primary crushing box 1 is fixedly connected with a feed pipe 9, and a crushing and drying mechanism is arranged at the lower end of the crushing and drying mechanism, and a discharge pipe 10 is fixedly connected with the lower end of the discharge pipe 10, and a straw storage box 11 is arranged at the lower end of the discharge pipe 10, and the saw roller 4 comprises a roller body 12 and a plurality of sawtooth blades 13, and the plurality of sawtooth blades 13 are fixedly connected to the outer surface of the roller body 12 in an annular array, and the sawtooth blades 13 on the surfaces of the two saw rollers 4 are meshed with each other, and the straw can be flattened by rotating the two press rollers 2, so as to facilitate subsequent cutting, and the two servo motors 5 can drive the two saw rollers 4 to form a bite-type motion, so as to crush the straw, and cooperate with the two reciprocating push rods 8 to perform reverse motion, so as to drive the two saw rollers 4 to reciprocate in the reverse direction, so as to saw off the straw that is not easy to break, and compared with the prior art, the present invention has a good straw crushing effect and high efficiency, and effectively avoids blockage in the subsequent straw processing process.

[0031] A straw transition platform 14 is fixedly connected to the inner bottom of the primary crushing box 1, and the upper surface of the straw transition platform 14 is lower than the gap height between the two pressing rollers 2. By setting the straw transition platform 14, the flattened straw can be easily inserted between the two pressing saw rollers 4.

[0032] A first annular electric heating plate 15 is fixedly connected to the interior of the nip roller 2 . The nip roller 2 can be heated by providing the first annular electric heating plate 15 .

[0033] A stepper motor 16 is fixedly connected to the inner wall of the primary crushing box 1, and the output end of the stepper motor 16 is fixedly connected to the rotating shaft of one of the press rollers 2. The outer surfaces of the rotating shafts of the two press rollers 2 are fixedly connected with transmission gears 17, and the two transmission gears 17 are meshed with each other. Through the stepper motor 16 and the two transmission gears 17, the stepper motor 16 can drive one of the press rollers 2 to rotate, and cooperate with the two transmission gears 17 for transmission, so that the two press rollers 2 can rotate synchronously in opposite directions, so that the straw can be flattened.

[0034] The crushing and drying mechanism includes a U-shaped shell 18, two second annular electric heating plates 19, a crushing and stirring rod 20, a spiral auger 21, an exhaust cover 22 and a hot air blower 23. The two second annular electric heating plates 19 are respectively fixedly connected to the upper and lower inner walls of the U-shaped shell 18, the crushing and stirring rod 20 and the spiral auger 21 are both rotatably connected to the inner side of the U-shaped shell 18, the hot air blower 23 is fixedly connected to the upper right side of the U-shaped shell 18, and the exhaust cover 22 is fixedly connected to the lower right side of the U-shaped shell 18. By setting the first annular electric heating plate 15, the pressing roller 2 can be heated, so that the initial heating can be performed during the process of flattening the straw. The straw is heated to remove moisture from the straw. Through the drying and crushing mechanism, the straw in the U-shaped shell 18 can be crushed again by rotating the crushing stirring rod 20. The crushed straw can be air-dried with the hot air blower 23, and the crushed straw can be blown from the upper end to the lower end of the U-shaped shell 18. The crushed straw can be turned over by rotating the spiral auger 21. The drying effect of the straw can be improved by cooperating with two second annular electric heating plates 19. The equipment can greatly improve the drying efficiency of the straw, and effectively improve the straw storage efficiency by shortening the drying time, while greatly reducing the probability of the straw being damp, moldy and damaged.

[0035] By providing the exhaust cover plate 22 , moisture in the U-shaped shell 18 can be easily discharged.

[0036] The left ends of the crushing and stirring rod 20 and the spiral auger 21 are both connected to the belt pulley 24 in a transmission manner, and the outer surfaces of the two belt pulleys 24 are jointly covered with a transmission belt 25. The left side of the straw storage box 11 is fixedly connected to a support platform 26, and the surface of the support platform 26 is fixedly connected to a power motor 27, and the output end of the power motor 27 is connected to the belt pulley 24 in a transmission manner. The power motor 27 can drive the belt pulley 24 to rotate, and the transmission is carried out by the transmission belt 25, so that the crushing and stirring rod 20 and the spiral auger 21 can rotate synchronously.

[0037] A hydraulic push rod 28 is fixedly connected to the inner wall of the straw storage box 11, and a right-angle pressure plate 29 is fixedly connected to the end of the hydraulic push rod 28, and the right-angle pressure plate 29 is slidably connected to the inner wall of the straw storage box 11. The hydraulic push rod 28 drives the right-angle pressure plate 29 to move, so that the straw entering the straw storage box 11 can be compressed, thereby increasing the straw storage capacity of the straw storage box 11.

[0038] A discharge window 30 is provided at the right end of the straw storage box 11, and a limiting groove 31 is provided on the inner wall of the discharge window 30. A door panel 32 for blocking the discharge window 30 is slidably connected in the limiting groove 31. By setting the limiting groove 31, the door panel 32 can be easily installed and disassembled. By removing the door panel 32, the discharge window 30 can be opened. At this time, the hydraulic push rod 28 is used to drive the right-angle pressure plate 29 to move, so that the straw in the straw storage box 11 can be easily moved out of the straw storage box 11.

[0039] Example 2, please refer to Figure 4 , including embodiment 1, and on the basis of embodiment 1, the present invention provides a technical solution: two sleeves 33 are embedded and fixed on the outer surface of the primary crushing box 1, and two reciprocating push rods 8 are slidably connected with the two sleeves 33, the outer surfaces of the reciprocating push rods 8 are fixedly connected with pistons 34, and the right surface of the sleeve 33 is provided with a first one-way valve 35, and the surface of the piston 34 is provided with a second one-way valve 36. By arranging the sleeve 33, the piston 34 and the first one-way valve 35 and the second one-way valve 36, when the reciprocating push rod 8 reciprocates, the piston 34 can be driven to reciprocate in the sleeve 33, and the first one-way valve 35 and the second one-way valve 36 can be used to control the air flow direction, so that the moisture in the primary crushing box 1 can be drawn into the sleeve 33 and discharged from the primary crushing box 1. Compared with the prior art, in the process of drying straw, the present device is not easy to accumulate moisture inside the device, thereby further improving the straw drying effect, which is beneficial to the subsequent storage of straw.

[0040] Working principle: When the straw recycling and transfer storage device is in use, firstly, the straw raw material is put into the primary crushing box 1 from the feeding window 3. At this time, the stepper motor 16 can drive the two pressing rollers 2 to rotate, so that the straw can be flattened. The first annular electric heating plate 15 can be used to heat the pressing roller 2, so that the straw can be preliminarily heated in the process of flattening the straw to remove moisture from the straw. The two servo motors 5 can drive the two pressing saw rollers 4 to form a bite-type motion, so that the straw can be crushed, and cooperate with the two reciprocating push rods 8 to move in the opposite direction. The limit slide bar 7 is used to limit the motor bracket 6, which can drive the two pressing saw rollers 4 to reciprocate in the opposite direction, and the multiple sawtooth blades 13 are meshed with each other and rubbed with each other, so as to The straw that is not easy to break can be sawed off. After being sawed off, the straw will enter the crushing and drying mechanism from the discharge pipe 9. The crushing and stirring rod 20 can be rotated to crush the straw in the U-shaped shell 18 again. The crushed straw can be air-dried with the help of the hot air blower 23, and the crushed straw can be blown from the upper end to the lower end of the U-shaped shell 18. The crushed straw can be turned over by rotating the spiral auger 21. The drying effect of the straw can be improved by cooperating with the two second annular electric heating plates 19. Finally, under the rotation of the spiral auger 21, the crushed and dried straw will enter the straw storage box 11 from the discharge pipe 10. The hydraulic push rod 28 drives the right-angle pressure plate 29 to move, and the straw entering the straw storage box 11 can be compressed, thereby realizing the storage of straw.

[0041] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the case of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0042] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A straw recycling and transfer storage device, comprising a primary crushing box (1), characterized in that: The primary crushing box (1) is internally rotatably connected to two pressing rollers (2), and a gap is left between the two pressing rollers (2). The surface of the primary crushing box (1) is fixedly connected to a feeding window (3) facing the middle position of the two pressing rollers (2). The primary crushing box (1) is internally provided with two pressing saw rollers (4) corresponding to the pressing rollers (2), and the ends of the two pressing saw rollers (4) are both provided with servo motors (5) for driving the pressing saw rollers (4) to rotate. The outer sides of the servo motors (5) are both fixedly connected to motor brackets (6). The inner wall of the primary crushing box (1) is fixedly connected to two servo motors (5) parallel to the axes of the pressing saw rollers (4). The primary crushing box (1) is provided with a limit slide bar (7), and the motor bracket (6) is slidably connected to the outer side of the limit slide bar (7). The side of the primary crushing box (1) away from the servo motor (5) is fixedly connected to two reciprocating push rods (8) that move in opposite directions through the bracket, and the telescopic ends of the two reciprocating push rods (8) are rotatably connected to the rotating ends of the two saw rollers (4) through connecting bearings respectively. The lower surface of the primary crushing box (1) is fixedly connected to a feed pipe (9), and a crushing and drying mechanism is arranged at the lower end of the feed pipe (9). The lower end of the crushing and drying mechanism is fixedly connected to a discharge pipe (10), and a straw storage box (11) is arranged at the lower end of the discharge pipe (10).

2. The straw recycling transfer storage device according to claim 1, characterized in that: The sawing roller (4) comprises a roller body (12) and a plurality of sawtooth blades (13). The plurality of sawtooth blades (13) are fixedly connected to the outer surface of the roller body (12) in an annular array, and the sawtooth blades (13) on the surfaces of two sawing rollers (4) are meshed with each other.

3. The straw recycling transfer storage device according to claim 1, characterized in that: A straw transition platform (14) is fixedly connected to the inner bottom of the primary crushing box (1), and the upper surface of the straw transition platform (14) is lower than the gap height between the two pressing rollers (2).

4. The straw recycling transfer storage device according to claim 1, characterized in that: A first annular electric heating plate (15) is fixedly connected inside the nip roller (2).

5. The straw recycling transfer storage device according to claim 2, characterized in that: A stepper motor (16) is fixedly connected to the inner wall of the primary crushing box (1), and the output end of the stepper motor (16) is fixedly connected to the rotating shaft of one of the pressing rollers (2). The outer surfaces of the rotating shafts of the two pressing rollers (2) are fixedly connected to transmission gears (17), and the two transmission gears (17) are meshed with each other.

6. The straw recycling transfer storage device according to claim 4, characterized in that: The crushing and drying mechanism comprises a U-shaped shell (18), two second annular electric heating plates (19), a crushing and stirring rod (20), a spiral auger (21), an exhaust cover plate (22) and a hot air blower (23); the two second annular electric heating plates (19) are respectively fixedly connected to the inner walls of the upper and lower ends of the U-shaped shell (18); the crushing and stirring rod (20) and the spiral auger (21) are both rotatably connected to the inner side of the U-shaped shell (18); the hot air blower (23) is fixedly connected to the right side of the upper end of the U-shaped shell (18); and the exhaust cover plate (22) is fixedly connected to the right side of the lower end of the U-shaped shell (18).

7. The straw recycling transfer storage device according to claim 1, characterized in that: The left ends of the crushing and stirring rod (20) and the spiral auger (21) are both connected to a pulley (24) in a transmission manner, and the outer surfaces of the two pulleys (24) are collectively sleeved with a transmission belt (25). The left side of the straw storage box (11) is fixedly connected to a support platform (26), and the surface of the support platform (26) is fixedly connected to a power motor (27), and the output end of the power motor (27) is connected to the pulley (24) in a transmission manner.

8. The straw recycling transfer storage device according to claim 1, characterized in that: The inner wall of the straw storage box (11) is fixedly connected to a hydraulic push rod (28), the end of the hydraulic push rod (28) is fixedly connected to a right-angle pressing plate (29), and the right-angle pressing plate (29) is slidably connected to the inner wall of the straw storage box (11).

9. The straw recycling transfer storage device according to claim 8, characterized in that: The right end of the straw storage box (11) is provided with a discharge window (30), the inner wall of the discharge window (30) is provided with a limiting groove (31), and a door panel (32) for sealing the discharge window (30) is slidably connected in the limiting groove (31).

10. The straw recycling transfer storage device according to claim 1, characterized in that: Two sleeves (33) are embedded and fixed on the outer surface of the primary crushing box (1), and two reciprocating push rods (8) are slidably connected to the two sleeves (33). The outer surfaces of the reciprocating push rods (8) are fixedly connected to pistons (34), and the right surface of the sleeve (33) is provided with a first one-way valve (35), and the surface of the piston (34) is provided with a second one-way valve (36).

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