A rake type vacuum dryer

Abstract

The present invention provides a rake type vacuum dryer, comprising an outer casing and a drying liner, a hot air interlayer is formed between the outer casing and the drying liner, a feed port and a discharge port are respectively arranged at the upper and lower ends of the drying liner, a servo motor is further arranged at the side end of the outer casing, a rake rod is arranged at the output end of the servo motor, a plurality of stirring rakes are further arranged on the rake rod, a power source 1 and a pair of push plates are further arranged in the drying liner, the stirring rake is slidably arranged on the rake rod, the power source 1 drives the push plate and the rake rod to move along the rake rod toward the discharge port, by arranging the push plate and making the stirring rake slidably arranged on the rake rod, when materials remain on both sides of the discharge port, the power source 1 drives the push plate and the rake rod to move toward the middle, thereby ensuring the sealing of the drying liner and moving the materials to the discharge port at the same time, preventing excessive accumulation of materials.

Description

Technical Field

[0001] The invention relates to a dryer, in particular to a rake type vacuum dryer. Background Art

[0002] Nickel carbonate is an inorganic compound with the chemical formula NiCO3. It is mainly used as a catalyst and can also be used for electroplating. It appears as a green powder. Although it is insoluble in water, nickel carbonate will absorb moisture in a humid state, causing it to agglomerate.

[0003] At present, a Chinese patent with announcement number CN117091373B discloses a high-efficiency multifunctional vacuum rake dryer, including a dryer body and a bracket, a feed pipe and a discharge pipe are respectively installed on the top and bottom of the dryer body, a reducer is arranged on the bracket, a rotating shaft is installed at one end of the reducer, the rotating shaft extends into the dryer and is provided with a plurality of rake teeth, and auxiliary discharge mechanisms are arranged at both ends of the dryer body, the auxiliary discharge mechanisms include circular plates, two original plates are provided with X-shaped through grooves, the through grooves are the same in shape as the rake teeth, and a telescopic air bag is arranged near the outer wall of the circular plate in the through groove, and the materials at both ends of the drying body are pushed into the storage pipe by the movement of the circular plate, thereby solving the problem of easy material residue.

[0004] The above patent still has shortcomings. The above patent uses an X-shaped groove to prevent the circular plate and the rake teeth from interfering with each other, and uses a telescopic airbag to solve the problem of sealing during drying. However, during the pushing process, the powdered product can easily pass through the X-shaped groove and enter the other side of the circular plate. At the same time, the above dryer uses a telescopic airbag for sealing during the drying process. The airbag material is relatively soft and has poor strength, which makes it impossible to reduce the air pressure in the dryer. Nickel carbonate will undergo thermal decomposition reaction at high temperature. When drying nickel carbonate, it is necessary to reduce the boiling temperature of the liquid by changing the air pressure. Therefore, the above dryer has great limitations when drying nickel carbonate. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a rake type vacuum dryer, which can solve the problem of material residue while ensuring the sealing of the dryer.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a rake-type vacuum dryer, comprising an outer casing and a drying liner, a hot air interlayer is formed between the outer casing and the drying liner, a feed port and a discharge port are respectively arranged at the upper and lower ends of the drying liner, a servo motor is also arranged at the side end of the outer casing, a rake rod is arranged at the output end of the servo motor, the rake rod extends into the drying liner, a plurality of stirring rakes are also arranged on the rake rod, an air suction component for extracting gas from the drying liner is also arranged above the outer casing, a power source 1 and a pair of pusher plates are also arranged in the drying liner, the pusher plates are arranged on both sides of the drying liner and are slidably arranged on the rake rod, the stirring rake is slidably arranged on the rake rod, the power source 1 drives the pusher plate and the rake rod to move along the rake rod toward the discharge port, and a reset component for driving the stirring rake to move back and a locking component for fixing the stirring rake are also arranged in the drying liner.

[0007] Through the above-mentioned technical means, by setting a push plate and making the stirring rake slidably set on the rake rod, when the material remains on both sides of the discharge port, the push plate and the rake rod are driven to move toward the middle by a power source, thereby ensuring the sealing of the drying liner while moving the material to the discharge port to prevent excessive accumulation of material, and fixing and moving the stirring rake back by a reset assembly and a locking assembly, and by moving the stirring rake to the bottom of the feed port, the fallen sticky material is pre-broken up to increase the breaking efficiency.

[0008] Preferably, the air suction component includes an air pump 1, whose output end is provided with an exhaust pipe 1 and is connected to the drying inner liner, the power source 1 includes an air pump 2 and an exhaust pipe 2, a power chamber is formed between the push plate and the drying inner liner, and the exhaust pipe 2 is connected to the drying inner liner and is arranged between the push plate and the drying inner liner.

[0009] Through the above technical means, the air pressure in the drying liner is controlled by air pump 1, and the air pressure in the power chamber is controlled by air pump 2, thereby driving the push plate to move.

[0010] Preferably, the mixing rake includes a horizontal rake and a vertical rake, the vertical rake is slidably arranged on the rake rod, an annular slide rail is also arranged in the power chamber, the horizontal rake passes through the push plate and the vertical rake and is arranged in the annular slide rail, and the horizontal rake rotates along the annular slide rail when the rake rod rotates.

[0011] Through the above-mentioned technical means, by setting a horizontal rake, the breaking effect is further increased to prevent the material from being broken up between the two horizontal rakes. The moving trajectory of the horizontal rake is limited by the annular slide rail. At the same time, space is left between the push plate and the drying liner to prevent the push plate from sticking to the drying liner when it moves to the outermost side, causing the air pump 2 to be unable to pressurize the power chamber.

[0012] Preferably, the rake rod is further provided with a limit groove 1 and a limit groove 2, the vertical rake comprises an outer rake and an inner rake, both of which are composed of a rake ring and rake teeth, the outer rake is slidably matched with the limit groove 1, and the inner rake is slidably matched with the limit groove 2, and the reset assembly drives the outer rake and the inner rake to move outward along the limit groove 1 and the limit groove 2.

[0013] Through the above technical means, the positions of the outer rake and the inner rake are limited by limit groove 1 and limit groove 2, and the locking component and the reset component are combined to enable the outer rake and the inner rake to return to the position before movement each time they are reset, thereby ensuring the breaking up effect of the outer rake and the inner rake, and at the same time making the outer rake and the inner rake rotate coaxially with the rake rod.

[0014] Preferably, the locking assembly includes an air pump three, a main air channel arranged in the rake rod, a locking rake air channel one and a locking rake air channel two, the main air channel is connected to the locking rake air channel one and the locking rake air channel two, the locking rake air channel one is arranged on both sides of the limiting groove one, and the locking rake air channel two is arranged on both sides of the limiting groove two.

[0015] Through the above technical means, the pressure in the locking rake airway one and the locking rake airway two is controlled by air pump three, so that when the inner rake and the outer rake move to the airway opening, the inner rake and the outer rake are pressed tightly by air pressure, thereby achieving the purpose of limiting the movement of the inner rake and the outer rake.

[0016] Preferably, valve nozzles are provided in both the first lock rake air passage and the second lock rake air passage.

[0017] Through the above technical means, when the push plate pushes the inner rake and the outer rake to move, air is blown toward the space between the push plate and the inner rake through the rake locking air channel 1 and the rake locking air channel 2, thereby blowing out the raw materials in the gap and preventing the raw materials from entering the power chamber.

[0018] Preferably, the reset assembly includes a pull rod arranged on the push plate, a reset hole is transversely opened on the rake teeth, a locking rake air channel three is opened on the inner side wall of the reset hole, a locking rake steel ball is arranged in the locking rake air channel three, and a ball groove cooperating with the locking rake steel ball is opened on the pull rod.

[0019] Through the above technical means, when the outer rake and the inner rake are against the limit groove one and the limit groove two, the locking rake air channel three is connected with the locking rake air channel one and the locking rake air channel two, the pressure can be increased and the locking rake steel ball can be pressed against the ball groove. When the push plate pushes the outer rake and the inner rake away, the pressure in the locking rake air channel three can still be maintained, thereby driving the outer rake and the inner rake to move back when the push plate moves back.

[0020] Preferably, a locking rod is also provided at the discharge port, the locking rod is arranged obliquely and extends into the discharge port, a sealing cover and a hand wheel are respectively provided at both ends of the locking rod, and a forming block cooperating with the sealing cover is also provided in the discharge port.

[0021] Through the above technical solution, the locking rod is arranged at an angle, so that the discharge port can be opened and closed conveniently.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The push plate and rake rod are driven toward the middle by power source 1, thereby ensuring the sealing of the drying liner and moving the material to the discharge port to prevent excessive accumulation of material;

[0024] 2. Move the stirring rake to the bottom of the feed inlet and rotate the rake rod to pre-break up the fallen sticky materials to increase the breaking efficiency;

[0025] 3. The pressure in the lock rake air passage 1 and the lock rake air passage 2 is controlled by the air pump 3, so that when the inner rake and the outer rake move to the air passage opening, the inner rake and the outer rake are pressed against each other by air pressure, thereby limiting the movement of the inner rake and the outer rake. By setting a valve nozzle, air is blown between the push plate and the inner rake to blow out the raw materials in the gap and prevent the raw materials from entering the power chamber.

[0026] 4. By connecting the rake lock air channel 3 with the rake lock air channel 1 and the rake lock air channel 2, the pressure can be increased and the rake lock steel ball can be pressed against the ball groove. When the push plate pushes the outer rake and the inner rake away, the pressure in the rake lock air channel 3 can still be maintained, thereby driving the outer rake and the inner rake to move back when the push plate moves back. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment;

[0028] Figure 2 is a cross-sectional schematic diagram of an embodiment;

[0029] Figure 3 for Figure 2 Schematic diagram of part A;

[0030] Figure 4 It is a schematic diagram of the structure of the drying liner in a stirring state;

[0031] Figure 5 This is a schematic diagram of the structure of the drying liner after pushing the material;

[0032] Figure 6 It is the structural schematic diagram of the stirring rake;

[0033] Figure 7 It is a schematic diagram of the structure when the push plate pushes the outer rake to move.

[0034] Figure numerals: 1, outer casing; 11, condensate flow channel; 12, servo motor; 2, drying liner; 21, feed port; 22, discharge port; 23, rake rod; 24, power source 1; 25, push plate; 26, air pump 2; 27, exhaust pipe 2; 28, power chamber; 29, horizontal rake; 210, vertical rake; 211, annular slide rail; 212, limit groove 1; 213, limit groove 2; 214, outer rake; 215, inner rake; 216, rake ring; 217, rake teeth; 218, sealing ring; 3. Suction assembly; 31. Air pump one; 32. Exhaust pipe one; 4. Reset assembly; 41. Pull rod; 42. Reset hole; 43. Lock rake air channel three; 44. Lock rake steel ball; 45. Ball groove; 5. Locking assembly; 51. Air pump three; 52. Main air channel; 53. Lock rake air channel one; 54. Lock rake air channel two; 55. Valve nozzle; 56. Convex ring; 57. Sealing strip; 6. Stirring rake; 7. Locking rod; 71. Sealing cover; 72. Hand wheel; 73. Forming block; 8. Steam flow channel; 81. Hot air interlayer. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0036] A rake vacuum dryer, such as Figure 1 , Figure 2 , Figure 4 As shown, it includes a steam flow channel 8, an outer casing 1 and a drying liner 2, a hot air interlayer 81 is formed between the outer casing 1 and the drying liner 2, the steam flow channel 8 is communicated with the hot air interlayer 81, and a condensed water flow channel 11 is also provided at the bottom of the outer casing 1 for discharging waste water generated by heat exchange, a feed port 21 and a discharge port 22 are respectively provided at the upper and lower ends of the drying liner 2, a locking rod 7 is also provided at the discharge port 22, the locking rod 7 is inclined and extends into the discharge port 22, a sealing cover 71 and a hand wheel 72 are respectively provided at both ends of the locking rod 7, the sealing cover 71 is provided in the discharge port 22, the hand wheel 72 is provided outside the discharge port 22, and a forming block 73 cooperating with the sealing cover 71 is also provided in the discharge port 22, a thread is provided on the locking rod 7 and cooperates with the thread of the outer wall of the discharge port 22, and the discharge port 22 can be opened or closed by rotating the hand wheel 72.

[0037] A servo motor 12 is also provided at the side end of the outer casing 1, and a rake rod 23 is provided at the output end of the servo motor 12. The rake rod 23 extends into the drying liner 2, and a plurality of stirring rakes 6 are also provided on the rake rod 23. An air suction component 3 for extracting the gas in the drying liner 2 is also provided above the outer casing 1. The air suction component 3 includes an air pump 31, and an air suction pipe 32 is provided at its output end and is connected to the outer wall of the drying liner 2 near the middle. When the air pump 31 is started, the drying liner 2 can be evacuated and deflated.

[0038] like Figure 4 , Figure 5 As shown, a pair of push plates 25 are also provided in the drying liner 2, and a sealing ring 218 is provided on the outer side of the push plate 25 to ensure the sealing between the push plate 25 and the drying liner 2. A power source 24 is also provided at the side end of the air pump 31. The power source 24 includes an air pump 26 and an air extraction pipe 27. A power cavity 28 is formed between the push plate 25 and the drying liner 2. The air extraction pipe 27 is connected to the drying liner 2 and is provided between the push plate 25 and the drying liner 2. The push plate 25 is provided on the drying liner 2. The two sides of the drying liner 2 are slidably arranged on the rake rod 23, and the stirring rake 6 is also slidably arranged on the rake rod 23. When the air pump 26 delivers air toward the power chamber 28, the push plate 25 and the rake rod 23 are driven to move along the rake rod 23 toward the discharge port 22. When it is necessary to extract the gas in the drying liner 2, the air pump 1 31 and the air pump 26 are simultaneously exhausted to ensure that the push plate 25 is fixed. A reset component 4 for driving the stirring rake 6 to move back and a locking component 5 for fixing the stirring rake 6 are also provided in the drying liner 2.

[0039] When the remaining nickel carbonate on both sides of the discharge port 22 needs to be delivered, air is supplied to the power chamber 28 through the air pump 26, so that the push plate 25 and the rake rod 23 can be pushed to move along the rake rod 23 toward the discharge port 22, thereby pushing the nickel carbonate to the discharge port 22. After completion, wet nickel carbonate needs to be added again for drying. At this time, the rake rod 23 is rotated by the servo motor 12 to make the push plate 25 and the rake rod 23 rotate, so that the nickel carbonate falling into the drying liner 2 can be pre-broken up. After adding a certain amount of nickel carbonate, the push plate 25 can be moved outward again.

[0040] like Figure 4 , Figure 5 , Figure 6 As shown, the stirring rake 6 includes a pair of horizontal rakes 29 and a vertical rake 210. The vertical rake 210 is slidably set on the rake rod 23. An annular slide rail 211 is also set in the power chamber 28. The horizontal rake 29 passes through the push plate 25 and the vertical rake 210 and is set in the annular slide rail 211. When the rake rod 23 rotates, the horizontal rake 29 rotates along the annular slide rail 211. By setting the horizontal rake 29, the breaking effect is further increased to prevent the bonded nickel carbonate from being broken up between the two horizontal rakes 29. The moving trajectory of the horizontal rake 29 is limited by the annular slide rail 211. At the same time, space is left between the push plate 25 and the drying liner 2 to prevent the push plate 25 from sticking to the drying liner 2 when the push plate 25 moves to the outermost side, resulting in the air pump 26 being unable to pressurize the power chamber 28.

[0041] The rake rod 23 is also provided with a limit groove 1 212 and a limit groove 213. The vertical rake 210 includes an outer rake 214 and an inner rake 215. The outer rake 214 and the inner rake 215 have the same structure and are composed of a rake ring 216 and six rake teeth 217. The rake ring 216 is sleeved on the rake rod 23, and the rake teeth 217 are arranged on the rake ring 216 in an annular array. The two cross rakes 29 are symmetrically arranged and pass through two of the rake teeth 217. The rake ring 216 of the outer rake 214 and the rake ring 216 of the inner rake 215 are both provided with key blocks. The height of the key block of the outer rake 214 is less than the height of the key block of the inner rake 215. The depth of the limit groove 1 212 is less than the limit groove 214. The depth of the second positioning groove 213 is determined, the key block of the outer rake 214 slides in cooperation with the limiting groove 1 212, and the key block of the inner rake 215 slides in cooperation with the limiting groove 213. When the reset component 4 drives the outer rake 214 and the inner rake 215 to move along the rake rod 23, the inner rake 215 is stuck at the edge position of the second limiting groove 213 and cannot move, and the outer rake 214 is stuck at the edge position of the limiting groove 1 212 and cannot move, so that the inner rake 215 and the outer rake 214 are moved to corresponding positions during resetting, thereby ensuring the breaking up effect of the outer rake 214 and the inner rake 215, and at the same time making the outer rake 214, the inner rake 215 and the rake rod 23 rotate coaxially.

[0042] like Figure 1 , Figure 3 , Figure 4 , Figure 7As shown, the locking assembly 5 includes an air pump 3 51, a main air channel 52 arranged in the rake rod 23, a locking rake air channel 1 53 and a locking rake air channel 2 54. The main air channel 52 is connected with the locking rake air channel 1 53 and the locking rake air channel 2 54. The locking rake air channel 1 53 is arranged on both sides of the limiting groove 1 212, and the locking rake air channel 2 54 is arranged on both sides of the limiting groove 213. A sealing strip 57 is also fixed on the key block to ensure gas sealing. When it is necessary to lock the inner rake 215 and the outer rake 214, pressure is applied to the main air channel 52 through the air pump 3 51, so that the air pressure presses against the outer rake 214 and the inner rake 215, so that the outer rake 214 and the inner rake 215 will not move during the normal breaking process. The locking rake air channel 1 53 and the locking rake air channel 2 54 are both provided with valve nozzles 55. When the residual nickel carbonate raw material is pushed out, the limiting groove 1 212 and the limiting groove 213 are closed. The second positioning groove 213 faces downward, and at this time the push plate 25 gradually moves toward the inner rake 215 and the outer rake 214. Both the push plate 25 and the outer rake 214 are provided with a convex ring 56. When the push plate 25 touches the outer rake 214, a certain gap is generated between the push plate 25 and the outer rake 214 through the convex ring 56. At this time, when the push plate 25 pushes the outer rake 214 to move and exposes the locking rake air channel 1 53, the locking rake air channel 1 53 will blow out a certain amount of gas and blow out the nickel carbonate particles remaining between the push plate 25 and the outer rake 214, ensuring that no nickel carbonate particles remain in the limiting groove 1 212 to prevent them from entering the power chamber 28. When the outer rake 214 touches the inner rake 215, the locking rake air channel 2 54 will blow out gas to blow out the particles between the outer rake 214 and the inner rake 215 and the particles in the limiting groove 213.

[0043] The reset assembly 4 includes a pull rod 41 arranged on the push plate 25, a reset hole 42 is horizontally opened on the rake teeth 217, and a locking rake air channel three 43 is opened on the inner side wall of the reset hole 42. When the outer rake 214 and the inner rake 215 are moved to the breaking station, the corresponding locking rake air channel three 43 is connected with the locking rake air channel one 53 and the locking rake air channel two 54. A locking rake steel ball 44 is arranged in the locking rake air channel three 43, and a bead groove 45 matched with the locking rake steel ball 44 is opened on the pull rod 41. When the push plate 25 is pushing, the pull rod 41 gradually extends into the reset hole 42 on the rake teeth 217 of the outer rake 214 and the inner rake 215, and the locking rake steel ball 44 is stuck in the bead groove 45. When the push plate 25 pushes out the outer rake 214 and the inner rake 215 while maintaining high pressure, the locking rake air channel three 43 is connected with the locking rake air channel one 53 and the locking rake air channel two 54. The pressure in the air channel three 43 will still press the steel ball into the ball groove 45, thereby driving the outer rake 214 and the inner rake 215 to move back when the push plate 25 moves back. By reducing the pressure in the main air channel 52 during the movement back, the air pressure in the rake locking air channel three 43 can be removed when the outer rake 214 and the inner rake 215 are reset, so that the pull rod 41 is disengaged from the corresponding reset hole 42. By changing the pressure in the main air channel 52, the clamping force of the rake locking steel ball 44 is changed, so that when the pull rod 41 is inserted into the reset hole 42, the rake locking steel ball 44 can be smoothly stuck in the ball groove 45, and when the pull rod 41 is pulled back, the inner rake 215 and the outer rake 214 can stably follow the push plate 25 to move. After the rake locking air channel three 43 and the rake locking steel ball 44 are opened, the inner rake 215 and the outer rake 214 can still be locked by increasing the pressure.

[0044] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A rake type vacuum dryer, comprising an outer casing (1) and a drying liner (2), a hot air interlayer (81) being formed between the outer casing (1) and the drying liner (2), a feed port (21) and a discharge port (22) being respectively arranged at the upper and lower ends of the drying liner (2), a servo motor (12) being arranged at the side end of the outer casing (1), a rake rod (23) being arranged at the output end of the servo motor (12), the rake rod (23) extending into the drying liner (2), a plurality of stirring rakes (6) being arranged on the rake rod (23), an air suction assembly (3) for extracting gas from the drying liner (2) being arranged above the outer casing (1), wherein: The drying inner container (2) is also provided with a power source (24) and a pair of push plates (25). The push plates (25) are arranged on both sides of the drying inner container (2) and are slidably arranged on the rake rod (23). The stirring rake (6) is slidably arranged on the rake rod (23). The power source (24) drives the push plates (25) and the rake rod (23) to move along the rake rod (23) toward the discharge port (22). The drying inner container (2) is also provided with a reset component (4) for driving the stirring rake (6) to move back and a locking component (5) for fixing the stirring rake (6). The air suction component (3) comprises an air pump (31), the output end of which is provided with an air extraction pipe (32) which is connected to the drying liner (2); the power source (24) comprises an air pump (26) and an air extraction pipe (27); a power chamber (28) is formed between the push plate (25) and the drying liner (2); the air extraction pipe (27) is connected to the drying liner (2) and is arranged between the push plate (25) and the drying liner (2); The stirring rake (6) comprises a horizontal rake (29) and a vertical rake (210), wherein the vertical rake (210) is slidably arranged on the rake rod (23), an annular slide rail (211) is further arranged in the power chamber (28), the horizontal rake (29) penetrates the push plate (25) and the vertical rake (210) and is arranged in the annular slide rail (211), and when the rake rod (23) rotates, the horizontal rake (29) rotates along the annular slide rail (211); The rake rod (23) is also provided with a limiting groove 1 (212) and a limiting groove 2 (213); the vertical rake (210) comprises an outer rake (214) and an inner rake (215); the outer rake (214) and the inner rake (215) are both composed of a rake ring (216) and rake teeth (217); the outer rake (214) is slidably matched with the limiting groove 1 (212); the inner rake (215) is slidably matched with the limiting groove 2 (213); the reset assembly (4) drives the outer rake (214) and the inner rake (215) to move outward along the limiting groove 1 (212) and the limiting groove 2 (213); The locking assembly (5) comprises an air pump three (51), a main air channel (52) arranged in the rake rod (23), a locking rake air channel one (53) and a locking rake air channel two (54), wherein the main air channel (52) is connected with the locking rake air channel one (53) and the locking rake air channel two (54), the locking rake air channel one (53) is arranged on both sides of the limiting groove one (212), and the locking rake air channel two (54) is arranged on both sides of the limiting groove two (213).

2. A rake type vacuum dryer according to claim 1, characterized in that: The lock rake air passage 1 (53) and the lock rake air passage 2 (54) are both provided with valve nozzles (55).

3. A rake type vacuum dryer according to claim 1, characterized in that: The reset assembly (4) comprises a pull rod (41) arranged on the push plate (25), a reset hole (42) is transversely opened on the rake teeth (217), a locking rake air channel three (43) is opened on the inner side wall of the reset hole (42), a locking rake steel ball (44) is arranged in the locking rake air channel three (43), and a ball groove (45) matching with the locking rake steel ball (44) is opened on the pull rod (41).

4. A rake type vacuum dryer according to claim 1, characterized in that: A locking rod (7) is also provided at the discharge port (22). The locking rod (7) is arranged at an angle and extends into the discharge port (22). A sealing cover (71) and a hand wheel (72) are provided at both ends of the locking rod (7). A forming block (73) cooperating with the sealing cover (71) is also provided in the discharge port (22).

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