Concrete mixing tank on concrete mixer for underground operation

Abstract

The utility model discloses a concrete mixing tank used on a concrete mixer truck for underground operation, which comprises a tank body assembly, a feed port flange, a feed port end cover assembly, a discharge port end cover assembly, a discharge port door opening mechanism and a discharge cover pressing mechanism, a spiral blade is arranged in the tank body assembly, the feed port flange is arranged at the feed port, and the discharge port end cover assembly is arranged at the discharge port end cover assembly. The feed port end cover is provided with a first sealing ring made of an organic polymer material, the feed port end cover assembly is connected with the tank body assembly, the discharge end cover assembly is provided with a second sealing ring made of an organic polymer material, and the discharge end cover assembly is connected with the discharge port door opening mechanism. And the discharging cover pressing mechanism is connected with the discharging opening door opening mechanism and extrudes the discharging opening end cover assembly. The utility model has the effect of improving the concrete supply condition of underground operation.

Description

Technical Field

[0001] The present application relates to the field of concrete machinery technology, and in particular to a concrete mixing tank used on a concrete mixer truck for underground operations. Background Art

[0002] The tunnel working surface formed after underground metal mining needs to be sprayed with concrete by a wet spraying machine to form a support layer. Usually, the tunnel of underground metal mines is low in height and narrow in width, and the mixing tank truck used to provide concrete for the wet spraying machine cannot enter the tunnel normally. The installation angle of the mixing tank of the traditional concrete mixing tank truck is in the range of 14°-16°, so the top of the discharge port of the mixing tank is the highest point of the whole vehicle. Usually, the arch height of the metal mine tunnel is less than or equal to 3.5 meters, so the traditional mixing tank truck cannot drive in the tunnel.

[0003] In order to provide sufficient concrete for the concrete wet spraying machine operating in the metal mine, the Chinese utility model patent with the authorization announcement number CN205380779U discloses a horizontally placed mixing drum and a mixing truck, wherein the mixing drum is arranged horizontally on the modified vehicle chassis, the feed port is arranged on the middle cylinder of the mixing drum and is sealed by a sealing door; the discharge end is also sealed by a sealing door; thus, the filling rate of the mixing drum is improved and the height of the whole vehicle is reduced. The instruction manual discloses: "The discharge port is made into a cone and welded to the rear end of the mixing drum, the sealing door welding seat is welded to the center of the drum, and then the tightening screw is welded to the sealing door welding seat, and the sealing rubber is installed on the rear end sealing door body, and then the sealing door is installed on the tightening screw, and the rear end tightening handle is rotated to achieve the purpose of feeding or retracting the rear end sealing door body, thereby achieving the purpose of sealing or opening the rear end sealing door." Since this structure welds the tightening screw to the sealing door welding seat, and the sealing door welding seat is welded in the center of the drum, it is not convenient for the tightening screw to be maintained in the later stage, and its rigidity, that is, the flexural deformation under long-term use, cannot be guaranteed. Secondly, the disclosed installation of a sealing rubber on the rear end sealing door body cannot guarantee the long-term stability of the sealing rubber performance, because the concrete contains lime components, and the lime makes the sealing rubber alkaline and therefore corrosive to the sealing rubber. Combined with its working conditions, it is known that when discharging, the contact of the sealing rubber with the concrete cannot be avoided. Therefore, after the concrete contacts the sealing rubber, the concrete will solidify on the sealing rubber and form a scab, which accelerates the failure of the sealing rubber. In addition, the specific shape and structure of the sealing rubber for achieving sealing have not been disclosed. Therefore, the sealing structure of this mixing drum is still a problem that needs to be solved urgently. Solving this problem can effectively improve the sealing efficiency of the mixing drum and improve the sanitary environment of the construction site.

[0004] In order to solve the above problems, the Chinese invention patent with the announcement number CN110039658A discloses a layout and sealing method of a mixing tank of a metal mine underground concrete mixer truck. The specification discloses that a groove is provided on the side of the feed cover, and an O-ring is provided in the groove. In combination with the attached drawings, it can be seen that: an inner conical surface is provided on the feed port on the tank body, and an outer conical surface is provided on the side of the feed cover. The two conical surfaces are the same. The concrete is sealed when the two are pressed together, and the O-ring provided at the groove on the side of the feed cover prevents water leakage in the mixing tank. Similarly, at the discharge port, a fixed screw is welded to the mixing tank mouth, and the outer conical surface of the discharge cover made of aluminum alloy and the inner conical surface provided at the eaves of the mixing port are used for hard extrusion to achieve the purpose of sealing the mixing tank mouth. Although this method can achieve sealing, it requires a very high dimensional accuracy of the structural matching between the two, and therefore, it is inevitable to increase the manufacturing cost. In addition, this hard extrusion sealing method is prone to cause the shape of the mixing tank mouth to deform, which also affects the sealing effect.

[0005] Based on the problems presented by the above-mentioned prior art, further improvement is still needed through technical means. Therefore, the present application proposes a concrete mixing tank used on a concrete mixer truck for underground operations. Utility Model Content

[0006] In view of this, in order to overcome the deficiencies in the above-mentioned prior art problems and improve the concrete supply conditions for underground operations, the present application provides a concrete mixing tank for use on a concrete mixer truck for underground operations.

[0007] The present application provides a concrete mixing tank on a concrete mixer truck for underground operation, which adopts the following technical solution:

[0008] A concrete mixing tank used in a concrete mixer truck for underground operation, comprising a tank body assembly with spiral blades arranged inside, a feed inlet flange, a feed inlet end cover assembly, a discharge port end cover assembly, a discharge port door opening mechanism, a discharge cover pressing mechanism, a self-lubricating bearing and a safety latch mechanism arranged on the feed inlet end cover assembly, the tank body assembly comprising a front cylinder body with a connecting flange for connecting a reducer at one end, an intermediate cylinder body connected to the other end of the front cylinder body and provided with a feed inlet, and a rear cylinder body connected to the intermediate cylinder body and provided with a raceway on the body, the spiral blades are arranged in a spiral line manner and are respectively wound and fixed on the inner walls of the front cylinder body, the intermediate cylinder body and the rear cylinder body in sequence, and the starting end of the spiral blade is arranged on the inner wall of the front cylinder body so that the terminal end of the spiral blade stops at the discharge port of the rear cylinder body, and the feed inlet flange is arranged at the feed inlet;

[0009] The intermediate cylinder is provided with a feed cover ear seat fitting at the feed inlet, the feed inlet end cover assembly has a first sealing ring made of an organic polymer material, the feed inlet end cover assembly is connected to the feed cover ear seat fitting, so that the feed inlet end cover assembly seals the feed inlet through the fit between the feed cover ear seat fitting and the inlet flange, and the discharge port end cover assembly has a second sealing ring made of an organic polymer material;

[0010] The front cylinder is provided with a conical head at one end away from the middle cylinder, and a locking piece is also provided on the front cylinder. The discharge port of the rear cylinder is provided with a material guide eave, and the material guide eave is arranged at an angle to the axis of the tank body, and a reinforcing cylinder is provided between the material guide eave and the rear cylinder;

[0011] The discharge port opening mechanism includes a screw support, a plurality of support rods arranged on the outer diameter of the screw support, and a screw shaft connected to the inner diameter of the screw support, the support rod is connected to the interior of the rear cylinder body, so that the screw support and the screw shaft are arranged at the center of the discharge port of the rear cylinder body, and the connection between the screw support and the screw shaft makes the screw support and the screw shaft connected as a whole and detachable, the self-lubricating bearing is installed on the screw shaft of the discharge port opening mechanism, the discharge port end cover assembly is arranged on the self-lubricating bearing, the discharge cover clamping mechanism is connected to the screw shaft of the discharge port opening mechanism, and one end of the discharge cover clamping mechanism is in contact with one end of the discharge port end cover assembly, and the discharge port end cover assembly is driven by the connection between the discharge cover clamping mechanism and the screw shaft, thereby driving the second sealing ring on the discharge port end cover assembly to contact or separate with the material guide eaves to achieve sealing or discharging of the discharge port.

[0012] Compared with the prior art, the concrete mixing tank of the present application has a first sealing ring made of an organic polymer material on the feed port end cover assembly, and a second sealing ring made of an organic polymer material on the discharge port end cover assembly, so that the first sealing ring and the second sealing ring are wear-resistant and more resistant to corrosion by the lime component in the concrete, so that even if the first sealing ring is covered with solidified concrete, the concrete and the first sealing ring can be separated by knocking with a blunt object, and the first sealing ring is not easily damaged by knocking.

[0013] The conical head at the end of the front cylinder is used to seal the opening in the center of the front cylinder to prevent concrete from overflowing from the opening in the center of the front cylinder, and the conical head also plays a role in enhancing the strength of the front cylinder, so that when the reducer is connected to the connecting flange, the conical head can effectively alleviate the deformation of the front cylinder, and make the cone angle of the conical head larger than the repose angle of the concrete, so that there will be no concrete accumulation at the conical head. The tank body assembly is welded with a guide eaves at the discharge port of the rear cylinder. The angle between the guide eaves and the tank body assembly allows the concrete in the tank body assembly to flow out quickly along the guide eaves. The locking piece at the front cylinder is used when the tank body assembly is overhauled. A safety pin is provided on the reducer bracket of the concrete mixer truck, and the safety pin is inserted into the locking piece. In this way, when someone is overhauling the tank body assembly, it is prevented from accidentally starting the tank body assembly, thereby increasing the safety of the concrete mixing tank. The reinforcement cylinder strengthens the firmness of the tank body assembly.

[0014] The detachable connection between the screw shaft and the screw support facilitates replacement when the trapezoidal thread on the screw shaft is worn, and facilitates repairing the deflection deformation of the screw shaft under long-term use.

[0015] Preferably, the feed port end cover assembly includes an end cover, a transition connector, a door opening mechanism and a door pressing mechanism, the end cover is connected to the first sealing ring so that the first sealing ring is stably located on the lower end surface of the end cover, the transition connector is connected at the center of the upper end surface of the end cover, the transition connector is provided with an oblong hole, the transition connector is connected to the door opening mechanism through the oblong hole, a threaded sleeve is provided at the center of the upper side of the door opening mechanism, the door pressing mechanism is threadedly connected to the threaded sleeve of the door opening mechanism, and the two ends of the door opening mechanism are respectively provided with a first pin sleeve and a second pin sleeve, the feed port end cover assembly is respectively connected to the two feed cover ear seat components through the first pin sleeve and the second pin sleeve at the two ends of the door opening mechanism.

[0016] Preferably, the first sealing ring includes a large base and a small base, the large base is connected to the small base, the connection between the large base and the small base is provided with a rounded corner, the outer edge of the small base is provided with a chamfer, and the periphery of the first sealing ring is evenly distributed with an array of connecting holes, the connecting holes vertically penetrate the small base and the large base, and the body of the small base is a conical surface, that is, the outer diameter of the end of the small base integrally connected to the large base is larger than the outer diameter of the end of the small base away from the large base, and the conical surface of the small base is arranged at an angle to the axial center line of the first sealing ring.

[0017] Preferably, the feed cover ear seat assembly includes an arc-bent plate arranged on the tank body assembly, an ear plate arranged on the arc-bent plate, and a rib plate arranged in the ear plate, and the lower end surface of the rib plate is arranged with a gap with the arc-bent plate.

[0018] Preferably, the discharge port end cover assembly also includes an end cover plate for connecting and fixing the second sealing ring to its inner end face, an outer eaves arranged at the outer edge of the end cover plate and arranged at an angle to the axial line of the end cover plate, a stepped shaft sleeve concentrically arranged at the center of the end cover plate, a guard plate arranged on the outer wall of the stepped shaft sleeve and having one end face abutting against the inner end face of the end cover plate, a support plate evenly arranged in an array on the outer wall of the stepped shaft sleeve and having an outer wall abutting against the end face of the end cover plate and the end face of the outer eaves, and a pressing plate arranged on the outer wall of the stepped shaft sleeve and abutting against the second sealing ring. The pressing plate, the second sealing ring and the end cover plate are screwed together so that The second sealing ring is defined between the pressure plate and the end cover plate, and the outer wall of the second sealing ring is provided with a conical surface which is at an angle to the axis of the end cover plate; the angle between the conical surface and the axis of the end cover plate is equal to the angle between the outer eaves and the axis of the end cover plate, and the angle between the outer eaves and the axis of the end cover plate is equal to the angle between the guide eaves and the axis of the tank body assembly; the stepped sleeve is provided with a stepped hole in the axial direction, and the stepped hole includes a third axial hole, a second axial hole and a first axial hole, the stepped sleeve is provided with through holes on the side wall of the first axial hole, and the stepped sleeve is provided with a stop at the junction of the second axial hole and the third axial hole.

[0019] Preferably, the discharge cover clamping mechanism includes a sleeve body and a crank handle evenly distributed in an array on the outer wall of the sleeve body, the sleeve body is provided with a thread in the axial direction, the sleeve body is provided with a withdrawal hole at one end near the self-lubricating bearing, and the side wall of the sleeve body is also provided with a countersink, the thread and the withdrawal hole form a shoulder, so that the sleeve body can limit the self-lubricating bearing through the shoulder, and the discharge cover clamping mechanism is connected to the screw shaft of the discharge port opening mechanism through the sleeve body, so that the discharge cover clamping mechanism can squeeze the discharge cover end cover assembly to realize the opening and closing of the discharge port.

[0020] Preferably, the feed port end cover assembly is provided with a second pin sleeve, and the feed port end cover assembly is also provided with a safety latch mechanism, the safety latch mechanism includes a safety bolt, a safety pin shaft and a chain composed of a plurality of chain links, the end cover of the feed port end cover assembly is provided with a shaft sleeve, the shaft sleeve is screwed to the safety bolt, one end of the chain is screwed on the end surface of the shaft sleeve through the large diameter end of the safety bolt, and the other end is connected to the safety pin shaft, the safety pin shaft passes through the second pin sleeve and the feed cover ear seat fitting at the front end of the feed port, so that the second pin sleeve is hinged to the feed cover ear seat fitting at the front end of the feed port, and the second pin sleeve is also provided with an internal threaded hole on the side wall perpendicular to the safety pin shaft, the safety bolt can limit the second pin sleeve by connecting with the internal threaded hole, and a socket is also welded on the upper side of the end cover, and the socket is used to temporarily place the safety pin shaft.

[0021] Preferably, the rear cylinder is provided with two spiral stirring blades evenly distributed on the inner wall of the rear cylinder.

[0022] Preferably, the number of the spiral blades is at least two groups.

[0023] Preferably, the organic polymer material may be polyurethane.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The primary and secondary seals of the large and small bases of the first sealing ring on the feed inlet flange make the sealing effect of the first sealing ring better and more resistant to corrosion by the lime component in the concrete. Even if the first sealing ring is covered with solidified concrete, it is not easy to be damaged by blunt impact, and the service life is longer.

[0026] 2. The second sealing ring is in contact and seal with the material guide eave at the discharge port. The performance of the material of the second sealing ring is wear-resistant and more resistant to corrosion by the lime component in the concrete. Even if the second sealing ring is covered with solidified concrete, it is not easy to damage the second sealing ring by hitting with a blunt object. Although the conical surface of the second sealing ring will wear out during repeated door opening, the angle between the conical surface and the axis of the end cover plate is always equal to the angle between the axis of the material guide eave and the tank body assembly. By continuing to push the crank handle of the cover clamping mechanism forward to move the second sealing ring forward, the wear of the second sealing ring can be compensated, so that it can always be in close contact with the material guide eave, thereby maximizing the utilization rate of the second sealing ring.

[0027] 3. A safety latch mechanism is disclosed. When the feed port end cover assembly and the tank body assembly are in an open state, the bolt at the internal threaded hole on the second pin sleeve is loosened, the safety pin shaft is pulled out, and the chain on the safety pin shaft rotates on the end surface of the sleeve. After the safety pin shaft is completely separated from the second pin sleeve and the feed port cover ear seat assembly, the small diameter end of the safety pin shaft is inserted into the socket on the feed port end cover assembly, thereby ensuring that the safety pin shaft is not lost, so that the door can be successfully closed after the tank body assembly is filled with concrete;

[0028] 4. When the feed port end cover assembly is opened, one end of the door opening mechanism is stuck on the upper end surface of the rib plate for limiting, so that after the cylinder assembly is filled with concrete, it is convenient for the feed port end cover assembly to be quickly closed;

[0029] 5. Two feed ports are used, each of which has the same feed port flange, the same feed port end cover assembly, and the same feed cover ear seat assembly. The purpose is that when one feed port is used to fill concrete into the tank assembly, the other feed port is convenient for observing the position of the concrete in the tank assembly, and for venting the tank assembly to keep the air pressure balanced, which is more convenient for later maintenance and repair of the tank assembly;

[0030] 6. Two spiral stirring blades are evenly distributed on the inner wall of the rear cylinder, so that the number of spiral stirring blades and spiral blades on the rear cylinder is four. When the discharge port cover assembly is opened, the concrete in the tank assembly is discharged four times through the spiral stirring blades and spiral blades every time the tank assembly rotates, which meets the concrete demand of the wet spraying machine.

[0031] 7. A detachable connection is realized between the screw shaft and the screw support, which is convenient for replacement when the trapezoidal thread on the screw shaft is worn, and convenient for repairing the deflection deformation of the screw shaft under long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a top view of the concrete mixing tank in this embodiment;

[0033] Figure 2 In this embodiment Figure 1 The cross-sectional view along line AA is shown;

[0034] Figure 3 In this embodiment Figure 1 The cross-sectional view along line BB is shown;

[0035] Figure 4 In this embodiment Figure 2 A local enlarged view of area II is shown;

[0036] Figure 5 This is an exploded view of the feed port end cover assembly in this embodiment;

[0037] Figure 6 It is a rear view of the concrete mixing tank in this embodiment;

[0038] Figure 7 In this embodiment Figure 1 A partial enlarged view of area Ⅰ is shown;

[0039] Figure 8 is a cross-sectional view of the first sealing ring in this embodiment;

[0040] Fig. 9 In this embodiment Figure 8 The partial enlarged schematic diagram shown in Ⅳ;

[0041] Fig.10 In this embodiment Figure 2 A partial magnified view of area III is shown;

[0042] Fig.11 It is a left side view of the concrete mixing tank in this embodiment;

[0043] Fig.12is a cross-sectional view of the discharge port end cover assembly in this embodiment;

[0044] Fig.13 is a cross-sectional view of the discharge cover pressing mechanism in this embodiment;

[0045] Fig.14 In this embodiment Figure 6 The cross-sectional view along the CC line is shown;

[0046] Fig.15 In this embodiment Fig.14 A partial cross-sectional view of V is shown.

[0047] Figure numerals: 1, tank body assembly; 2, feed inlet flange; 3, feed inlet end cover assembly; 4, discharge port end cover assembly; 5, discharge port door opening mechanism; 6, discharge cover pressing mechanism; 7, self-lubricating bearing; 8, safety latch mechanism; 9, front cylinder; 10, intermediate cylinder; 11, raceway; 12, rear cylinder; 13, spiral blade; 14, feed cover ear seat assembly; 15, first sealing ring; 16, second sealing ring; 17, cone head; 18, stopper; 19, guide eaves; 20, reinforcement cylinder; 21, feed inlet; 22, discharge port; 23, screw support; 24, support rod; 25, screw shaft; 26, end cover; 27, transition connector; 28, door opening mechanism; 29, door pressing mechanism; 30, oblong hole; 31, threaded sleeve; 32, The first pin sleeve; 33, the second pin sleeve; 34, the large base; 35, the small base; 36, the fillet; 37, the chamfer; 38, the connecting hole; 39, the conical surface; 40, the curved plate; 41, the ear plate; 42, the rib plate; 43, the end cover plate; 44, the outer eaves; 45, the stepped shaft sleeve; 46, the guard plate; 47, the support plate; 48, the pressure plate; 49, the conical surface; 50, the stepped hole; 51, the third axial hole; 52, the second axial hole; 53, the first axial hole; 54, the small hole; 55, the shaft sleeve body; 56, the crank handle; 57, the thread; 58, the retreat hole; 59, the countersink; 60, the safety bolt; 61, the safety pin shaft; 62, the chain; 63, the shaft sleeve; 64, the internal threaded hole; 65, the socket; 66, the spiral stirring blade; 67, the hinge; 68, the connecting flange. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-15 This application is described in further detail.

[0049] The embodiment of the present application discloses a concrete mixing tank used on a concrete mixer truck for underground operations.

[0050] refer to Figure 1 and Figure 2, including a tank body assembly 1 with a spiral blade 13 inside, a feed port flange 2, a feed port end cover assembly 3, a discharge port end cover assembly 4, a discharge port door opening mechanism 5 and a discharge cover pressing mechanism 6. The tank body assembly 1 includes a front cylinder 9, an intermediate cylinder 10 and a rear cylinder 12 from left to right. The left end of the front cylinder 9 is provided with a connecting flange 68 for connecting a reducer. The side wall of the intermediate cylinder 10 is provided with a feed port 21. The feed port flange 2 is welded at the feed port 21 of the intermediate cylinder 10. The feed port end cover assembly 3 is arranged on the feed port flange 2 A rolling track 11 is provided on the side wall of the rear cylinder 12, a discharge port 22 is provided at the end of the rear cylinder 12, a discharge port end cover assembly 4 is arranged at the discharge port 22, one end of a discharge port opening mechanism 5 is connected to the discharge port end cover assembly 4, and the other end is connected to the discharge cover clamping mechanism 6, and the spiral blade 13 is arranged in a spiral line and is respectively wound around and fixed on the inner walls of the front cylinder 9, the middle cylinder 10 and the rear cylinder 12 in sequence, so that the starting end of the spiral blade 13 is located on the inner wall of the front cylinder 9 and the ending end is located at the discharge port 22 of the rear cylinder 12.

[0051] A conical head 17 is welded to the front cylinder 9 near the connecting flange. The conical head 17 is used to seal the opening in the center of the front cylinder 9 to prevent concrete from overflowing from the opening in the center of the front cylinder 9. The conical head 17 also serves to enhance the strength of the front cylinder 9, so that when the reducer is connected to the connecting flange 68, the conical head 17 can effectively alleviate the deformation of the front cylinder 9 and make the cone angle of the conical head 17 greater than the repose angle of the concrete, so that no concrete will accumulate at the conical head 17.

[0052] refer to Figure 3 , Figure 4 and Figure 5 The intermediate cylinder 10 is respectively welded with feed cover ear seat fittings 14 on the front and rear sides of the feed port 21, and the two ends of the feed port end cover assembly 3 have hinged parts 67, and the feed port end cover assembly 3 is connected to the two feed cover ear seat fittings 14 through the hinged parts 67, and the feed port end cover assembly 3 has a first sealing ring 15 made of a polymer material, so that the feed port end cover assembly 3 can adjust the position of the first sealing ring 15 of the feed port end cover assembly 3 and the feed port flange 2 through the connection with the feed cover ear seat fitting 14, and the feed port flange 2 of the feed port 21 is sealed and connected to the feed port end cover assembly 3 through the fitting of the first sealing ring 15 and the feed port flange 2.

[0053] The feed port end cover assembly 3 includes, from bottom to top, an end cover 26, a transition connector 27, a door opening mechanism 28 and a door pressing mechanism 29. The end cover 26 is screwed to the first sealing ring 15, so that the first sealing ring 15 is stably connected to the lower end face of the end cover 26. The transition connector 27 includes a horizontal plate parallel to the end cover 26 and a vertical plate perpendicular to the horizontal plate. The transition connector 27 is screwed to the center of the upper end face of the end cover 26 by the horizontal plate screws. The vertical plate of the transition connector 27 is provided with an oblong hole 30. The transition connector 27 is screwed to the door opening mechanism 28 through the oblong hole 30, so that the door opening mechanism 28 is stably restricted on the upper side. A threaded sleeve 31 is integrally connected to the center of the upper side of the door opening mechanism 28. The door pressing mechanism 29 is threadedly connected to the threaded sleeve 31 of the door opening mechanism 28. The feed port end cover assembly 3 includes an end cover 26, a transition connector 27 ... The hinged portion 67 of the cover assembly 3 is a first pin sleeve 32 and a second pin sleeve 33 provided at both ends of the door opening mechanism 28, that is, the feed port end cover assembly 3 is hinged to the two feed cover ear seat fittings 14 respectively through the first pin sleeve 32 and the second pin sleeve 33 at both ends of the door opening mechanism 28, and the first pin sleeve 32 is hinged to the feed cover ear seat fitting 14 at the rear end of the feed port 21, and is hinged through the pin shaft in GB / T880 recommended by the national standard, and the flat washers in GB / T97.2 and the GB / T91 cotter pin are respectively installed at both ends of the pin shaft, and the axial direction of the first pin sleeve 32 is parallel to the direction of travel of the mixer truck. Therefore, the opening and closing of the feed port end cover assembly 3 will not be affected by the inertial force generated by the travel and parking of the mixer truck, thereby reducing the uncontrolled opening and closing phenomenon of the feed port end cover assembly 3.

[0054] refer to Figure 6 and Figure 7The second pin sleeve 33 is hinged with the feed cover ear seat fitting 14 at the front end of the feed port 21. A safety latch mechanism 8 is also provided on the feed port end cover assembly 3. The safety latch mechanism 8 includes a safety bolt 60, a safety pin shaft 61 and a chain 62 composed of a plurality of chain links. A shaft sleeve 63 is provided on the end cover 26 of the feed port end cover assembly 3. The shaft sleeve 63 is screwed with the safety bolt 60. One end of the chain 62 is screwed on the end surface of the shaft sleeve 63 through the large diameter end of the safety bolt 60, and the other end is connected to the safety pin shaft 61. The safety pin shaft 61 passes through the second pin sleeve 33 and the feed cover ear seat fitting 14 at the front end of the feed port 21, so that the second pin sleeve 33 is hinged with the feed cover ear seat fitting 14 at the front end of the feed port 21, and the feed port end cover assembly 3 is locked on the tank body fitting 1, and the second pin sleeve 33 is screwed with the safety pin shaft 61. An internal threaded hole 64 is provided on the side wall at the connection of the pin shaft 61. The second pin sleeve 33 is connected to the internal threaded hole 64 by bolts, so that the safety pin shaft 61 is radially squeezed and fixed in the second pin sleeve 33 and the feed cover ear seat assembly 14. A socket 65 is also welded on the upper side of the end cover 26. When the user needs to open the feed port end cover assembly 3 and the feed port flange 2, the user loosens the bolts at the internal threaded hole 64 of the second pin sleeve 33, pulls out the safety pin shaft 61, and the chain 62 on the safety pin shaft 61 rotates on the end surface of the sleeve 63. After the safety pin shaft 61 is completely separated from the second pin sleeve 33 and the feed cover ear seat assembly 14, the small diameter end of the safety pin shaft 61 is inserted into the socket 65 on the end cover 26, so as to ensure that the safety pin shaft 61 is not lost, so that the door can be smoothly sealed after the tank body assembly 1 is filled with concrete.

[0055] refer to Figure 8 and Fig. 9The first sealing ring 15 includes a large base 34 and a small base 35 concentrically arranged on the large base 34. The large base 34 and the small base 35 are connected as a whole. The outer diameter of the small base 35 is smaller than the outer diameter of the large base 34. A fillet 36 is provided at the connection between the small base 35 and the large base 34, and a chamfer 37 is provided at the outer edge of the small base 35. The first sealing ring 15 is uniformly distributed with array connection holes 38 around the center of the large base 34. The connection holes 38 vertically penetrate the small base 35. The base 35 and the large base 34 are provided with a conical surface 39, that is, the outer diameter of the end of the small base 35 connected to the large base 34 is larger than the outer diameter of the end of the small base 35 away from the large base 34, and the conical surface 39 of the small base 35 is arranged at an angle β to the axial center line of the first sealing ring 15, and the β angle of the conical surface 39 of the small base 35 is equal to the angle of the port conical surface 39 of the feed inlet flange 2. The user screws the door pressing mechanism 29 and the threaded sleeve 31 together to make the door pressing mechanism The structure 29 contacts the bottom surface of the transition connecting piece 27, and the bottom surface of the transition connecting piece 27 transmits the pressing force generated by the door pressing mechanism 29 to the contact end cover 26, and the first sealing ring 15 is pressed on the feed inlet flange 2 through the end cover 26, so that the first sealing ring 15 realizes a primary seal on the feed inlet flange 2 through the large base 34, and the conical surface 39 of the body of the small base 35 and the port conical surface 39 of the feed inlet flange 2 realize the secondary seal of the first sealing ring 15 at the feed inlet flange 2, thereby ensuring that the concrete in the tank body assembly 1 does not overflow. When the first sealing ring 15 is worn and thinned, the user adjusts the connection position of the door opening mechanism 28 and the transition connecting piece 27 toward the lower part close to the oblong hole 30 of the transition connecting piece 27, so that the gap between the door opening mechanism 28 and the transition connecting piece 27 is smaller, and then the first sealing ring 15 is connected to the end cover 26 through the screws, so that the first sealing ring 15 can continue to be used, so as to maximize the utilization rate of the first sealing ring 15.

[0056] The material of the first sealing ring 15 is polyurethane. The Shore hardness of polyurethane is higher than that of ordinary rubber materials. It is more wear-resistant and can better resist the corrosion of the lime component in concrete. Even if the first sealing ring 15 is covered with solidified concrete, the concrete and the first sealing ring 15 can be separated by knocking with a blunt object, and the first sealing ring 15 is not easily damaged by knocking.

[0057] refer to Figure 1 , Fig.10 and Fig.11The tank body assembly 1 is welded with a material guide eave 19 at an angle α to the axial line of the tank body assembly 1 at the discharge port 22 of the rear cylinder 12, and the value of the angle α is greater than or equal to 45°, so that the concrete in the tank body assembly 1 can flow out quickly along the material guide eave 19, and a reinforcement cylinder 20 is welded between the outer wall of the material guide eave 19 and the outer wall of the rear cylinder 12. A locking member 18 is provided on the outer end face of the front cylinder 9, and the locking member 18 is used when the tank body assembly 1 is overhauled. A safety pin is provided on the reducer bracket of the concrete mixer truck, and the safety pin is inserted into the locking member 18. In this way, when someone is overhauling the tank body assembly 1, it is prevented from starting the tank body assembly 1 by mistake.

[0058] The discharge port opening mechanism 5 includes a screw support 23, a plurality of support rods 24 arranged on the outer diameter of the screw support 23, and a screw shaft 25 connected to the inner diameter of the screw support 23. The radial direction of the screw support 23 and the screw shaft 25 is also reinforced by screw connection, so that the screw support 23 and the screw shaft 25 are connected as a whole, so that the screw support 23 and the screw shaft 25 are both located at the center of the discharge port 22 of the rear cylinder 12, and the other end of the screw shaft 25 extends to the outside of the tank body assembly 1, thereby realizing a detachable connection between the screw shaft 25 and the screw support 23. The screw shaft 25 is provided with a trapezoidal thread on the outer wall away from the rear cylinder 12. The detachable connection between the screw shaft 25 and the screw support 23 makes it easy to replace the trapezoidal thread after it is worn, and it is easy to repair the deflection deformation of the screw shaft 25 under long-term use, thereby overcoming the shortcomings of the prior art.

[0059] refer to Fig.10 and Fig.11 The discharge port end cover assembly 4 includes a second sealing ring 16 made of an organic polymer material, an end cover plate 43 for connecting and fixing the second sealing ring 16 to its inner end surface, an outer edge 44 arranged at the outer edge of the end cover plate 43 and arranged at an angle γ to the axis of the end cover plate 43, a stepped sleeve 45 concentrically arranged at the center of the end cover plate 43, a guard plate 46 arranged on the outer wall of the stepped sleeve 45 and having one end surface in contact with the inner end surface of the end cover plate 43, and a uniformly arranged array on the outer wall of the stepped sleeve 45 and having the outer wall in contact with the right end surface of the end cover plate 43. A support plate 47 is fitted to the inner end surface of the outer eaves 44, and a pressure plate 48 is arranged on the outer wall of the stepped sleeve 45 and fits with the second sealing ring 16. The pressure plate 48, the second sealing ring 16 and the end cover plate 43 are screwed together, so that the second sealing ring 16 is confined between the pressure plate 48 and the end cover plate 43, and the outer wall of the second sealing ring 16 is formed into a conical surface 49 which forms an angle δ with the axis of the end cover plate 43, and the δ angle of the conical surface 49 is equal to the γ angle of the outer eaves 44, and the γ angle of the outer eaves 44 is equal to the α angle of the guide eaves 19.

[0060] The stepped shaft sleeve 45 is provided with stepped holes 50 axially from left to right, which are respectively the third shaft hole 51, the second shaft hole 52 and the first shaft hole 53 from left to right. The stepped shaft sleeve 45 is provided with through small holes 54 evenly distributed on the side wall of the first shaft hole 53. The stepped shaft sleeve 45 is provided with a stop at the junction of the second shaft hole 52 and the third shaft hole 51.

[0061] refer to Fig.10 , Fig.12 and Fig.13 The inner diameter of the self-lubricating bearing 7 is sleeved on the screw shaft 25 of the discharge door opening mechanism 28, the outer diameter of the self-lubricating bearing 7 is fitted with the second shaft hole 52 of the stepped sleeve 45, the left end of the self-lubricating bearing 7 is limited by the stopper in the stepped sleeve 45, and the other end is connected with the discharge cover clamping mechanism 6, the discharge cover clamping mechanism 6 includes a sleeve body 55 and a crank handle 56 evenly arranged on the outer wall of the sleeve body 55, the sleeve body 55 is axially provided with a thread 57 of a trapezoidal thread, the sleeve body 55 is provided with a retreat hole 58 at one end near the self-lubricating bearing 7, and the side wall of the sleeve body 55 is also provided with a countersink 59, and the discharge cover The clamping mechanism 6 is configured such that the sleeve body 55 is screwed into the screw shaft 25 of the discharge port opening mechanism 5 so that the sleeve body 55 is screwed into the trapezoidal thread on the screw shaft 25 of the discharge port opening mechanism 5. The outer wall of the sleeve body 55 of the discharge cover clamping mechanism 6 can fit with the inner wall of the third axial hole 51 of the discharge port end cover assembly 4, so that the end of the sleeve body 55 near the self-lubricating bearing 7 is limited in the stepped sleeve 45 through the withdrawal hole 58, that is, the end of the self-lubricating bearing 7 near the third axial hole 51 is passed through the withdrawal hole 58 of the sleeve body 55 and the shoulder formed by the thread 57 and the withdrawal hole 58 for limiting the position.

[0062] That is, the discharge cover clamping mechanism 6 is arranged on the screw shaft 25 of the discharge port door opening mechanism 5, and the discharge cover clamping mechanism 6 is connected to the discharge port end cover assembly 4 by connecting with the discharge port door opening mechanism 5, so that the discharge cover clamping mechanism 6 drives the discharge port end cover assembly 4 to move by screwing with the screw shaft 25, and then drives the second sealing ring 16 on the discharge port end cover assembly 4 to move accordingly, so as to achieve the contact or separation between the second sealing ring 16 and the material guide eaves 19, so as to achieve the sealing or discharging of the discharge port 22. When the user needs to open the discharge port end cover assembly 4, the shaft sleeve body 55 of the discharge cover clamping mechanism 6 is screwed with the trapezoidal thread on the screw shaft 25 through the thread 57. Since the shaft sleeve body 55 of the discharge cover clamping mechanism 6 is installed in the first shaft hole 53 of the stepped shaft sleeve 45, the shaft sleeve body 55 of the discharge cover clamping mechanism 6 and the ladder shaft sleeve 63 The first shaft hole 53 is connected through the small hole 54 and the countersunk hole 59 through the pin standard parts to realize the linkage of the discharge cover clamping mechanism 6 to drive the discharge port end cover assembly 4. The user pulls the crank handle 56 of the discharge cover clamping mechanism 6 to make the shaft sleeve body 55 of the discharge cover clamping mechanism 6 drive the discharge port end cover assembly 4 to move. During the movement of the discharge port end cover assembly 4, the stepped shaft sleeve 45 stop of the discharge port end cover assembly 4 drives the self-lubricating bearing 7 to move rightward along the screw shaft 25 following the synchronous line of the material end cover 26 assembly, so that the conical surface 49 of the second sealing ring 16 arranged at an angle of δ is separated from the material guide eaves 19, and the discharge port end cover assembly 4 is opened, so that the concrete in the tank body assembly 1 can be discharged. In this process, the guard plate 46 ensures the stability of the end cover plate 43, and the pressure plate 48 ensures the stability of the second sealing ring 16.

[0063] Similarly, when the user needs to open the discharge port end cover assembly 4, the user pulls the crank handle 56 of the discharge port cover clamping mechanism 6 in the opposite direction, and the shoulder limit formed by the thread 57 and the knife withdrawal hole 58 pushes the self-lubricating bearing 7 to move forward on the screw shaft 25, so that the second sealing ring 16 on the end cover plate 43 contacts the material guide eaves 19, and further continues to pull the crank handle 56 of the cover clamping mechanism to compress the second sealing ring 16 on the material guide eaves 19, so that the second sealing ring 16 seals the discharge port 22. In this embodiment, since the material of the second sealing ring 16 is polyurethane, its Shore hardness is higher than that of ordinary rubber materials, so it is wear-resistant and more resistant to mixing. The corrosion of the lime component in the concrete, even if the second sealing ring 16 is coated with solidified concrete, it is not easy to damage the second sealing ring 16 by hitting with a blunt object. Although the conical surface 49 of the second sealing ring 16 will wear during the repeated opening of the door, its δ angle is always consistent with the angle of the material guide eaves 19 arranged at an angle α to the axis of the tank body assembly 16. By continuing to push the crank handle 56 of the cover clamping mechanism forward, the second sealing ring 16 continues to move forward, which can compensate for the wear of the second sealing ring 16 and make it always in airtight contact with the material guide eaves 19, thereby maximizing the utilization rate of the second sealing ring 16. This is also a technical effect that cannot be obtained by the prior art. The deformation of the material port caused by the extrusion between the material guide eaves 19 and the second sealing ring 16 is overcome by the reinforcement tube 20. The deformation of the end cover plate 43 and the outer eaves 44 caused by the extrusion between the material guide eaves 19 and the second sealing ring 16 is resisted by the support plate 47;

[0064] Furthermore, the pin standard part used in this embodiment is an elastic cylindrical pin.

[0065] Furthermore, in this embodiment, the material of the self-lubricating bearing 7 is preferably brass or copper alloy as the main material, and graphite is embedded in the main material as a solid lubricant, so that the lubrication and maintenance of the components corresponding to the self-lubricating bearing 7 are eliminated.

[0066] For further reference, Figure 1 In this embodiment, two feed ports 21 are provided, and the feed port flanges 2, the feed port end cover assemblies 3, and the feed cover ear seat assembly 14 on the two feed ports 21 are all identical, so that when one feed port 21 is used to fill concrete into the tank body assembly 1, the user can observe the position of the concrete in the tank body assembly 1 through the other feed port 21, and facilitate the exhaust condition in the tank body assembly 1, facilitate the balance of the air pressure in the tank body assembly 1, and also facilitate the maintenance of the tank body assembly 1 in the later stage.

[0067] Further, in this embodiment, reference Fig.14 and Fig.15The feed cover ear seat assembly 14 includes an arc plate 40 arranged on the tank body assembly 1, two ear plates 41 with hinge holes arranged on the arc plate 40, and a rib plate 42 arranged in the two ear plates 41 with hinge holes and connected to the ear plates 41 at both ends. The lower end surface of the rib plate 42 is arranged with a gap L with the arc plate 40, and the value of the gap L is within the range of 5-10mm, which is convenient for the discharge of rainwater. At the same time, the upper end surface of the rib plate 42 is used to realize the limit when the feed port end cover assembly 3 is opened, and one end of the cover opening mechanism 28 is stuck on the upper end surface of the rib plate 42 for limit. In this way, after the cylinder assembly is filled with concrete, the feed port end cover assembly 3 is convenient for rapid closure.

[0068] Furthermore, in the present embodiment, two spiral stirring blades 66 are evenly distributed on the inner wall of the rear cylinder 12, and the length of the spiral stirring blades 66 is equal to the length of the rear cylinder 12, and the number of spiral blades 13 of the tank body assembly 1 is at least two groups, so that the spiral stirring blades 66 and spiral blades 13 at the position of the rear cylinder 12 add up to four. When the discharge port end cover assembly 4 is opened, the concrete in the tank body assembly 1 is discharged four times through the spiral stirring blades 66 and spiral blades 13 for each rotation of the tank body assembly 1, thereby meeting the concrete requirements of the wet spraying machine.

[0069] Furthermore, the present embodiment does not limit the shape structure of the front cylinder 9. The shape of the front cylinder 9 can be a hemispherical curved surface shape or a conical shape. The hemispherical curved surface shape of the front cylinder 9 can be formed by mold stamping, and the conical shape of the front cylinder 9 can be formed by rolling and then welding. The shape structure of the front cylinder 9 is preferably a hemispherical curved surface shape, which has the beneficial effect that concrete is not accumulated inside the front cylinder 9 and the concrete is not segregated during the mixing process. During the concrete mixing process, the hemispherical curved surface shape of the front cylinder 9 always flows toward the middle cylinder 10, so that the root of the hemispherical curved surface is always in a dynamic surging state, and the discharge effect is better than that of the conical shaped front cylinder 9.

[0070] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A concrete mixing tank for a concrete mixer truck used in underground operations, comprising a tank body assembly (1) with a spiral blade (13) arranged inside, a feed inlet flange (2), a feed inlet end cover assembly (3), a discharge port end cover assembly (4), a discharge port door opening mechanism (5), a discharge cover pressing mechanism (6), a self-lubricating bearing (7) and a safety latch mechanism (8) arranged on the feed inlet end cover assembly (3), wherein the tank body assembly (1) comprises a front cylinder (9) with a connecting flange for connecting a reducer at one end, a device connected to the other end of the front cylinder (9) An intermediate cylinder (10) having a feed port (21), and a rear cylinder (12) having a roller track (11) on its body connected to the intermediate cylinder (10), wherein the spiral blades (13) are respectively wound around and fixed on the inner walls of the front cylinder (9), the intermediate cylinder (10), and the rear cylinder (12) in a spiral arrangement, and the starting end of the spiral blades (13) is arranged on the inner wall of the front cylinder (9) so that the terminal end of the spiral blades (13) stops at the discharge port (22) of the rear cylinder (12), and the feed port flange (2) is arranged at the feed port (21); Features: The intermediate cylinder (10) is provided with a feed cover ear seat fitting (14) at the feed port (21); the feed port end cover assembly (3) has a first sealing ring (15) made of an organic polymer material; the feed port end cover assembly (3) is connected to the feed cover ear seat fitting (14) so ​​that the feed port end cover assembly (3) seals the feed port (21) through the fit between the feed cover ear seat fitting (14) and the inlet flange; and the discharge port end cover assembly (4) has a second sealing ring (16) made of an organic polymer material; The front cylinder (9) is provided with a conical head (17) at one end away from the intermediate cylinder (10), and the front cylinder (9) is also provided with a locking member (18). The discharge port (22) of the rear cylinder (12) is provided with a material guide eave (19), and the material guide eave (19) is arranged at an angle to the axis of the tank body assembly (1), and a reinforcing cylinder (20) is provided between the material guide eave (19) and the rear cylinder (12); The discharge port opening mechanism (5) comprises a screw support (23), a plurality of support rods (24) arranged on the outer diameter of the screw support (23), and a screw shaft (25) connected to the inner diameter of the screw support (23); the support rod (24) is connected to the interior of the rear cylinder (12), so that the screw support (23) and the screw shaft (25) are arranged at the center of the discharge port (22) of the rear cylinder (12); and the connection between the screw support (23) and the screw shaft (25) makes the screw support (23) and the screw shaft (25) connected in an integral and detachable manner; the self-lubricating bearing (7) is installed at the discharge port opening mechanism (5). The discharge port end cover assembly (4) is arranged on the screw shaft (25) and on the self-lubricating bearing (7). The discharge port end cover pressing mechanism (6) is connected to the screw shaft (25) of the discharge port door opening mechanism (5), and one end of the discharge port end cover pressing mechanism (6) is in contact with one end of the discharge port end cover assembly (4). The discharge port end cover assembly (4) is driven by the connection between the discharge port end cover pressing mechanism (6) and the screw shaft (25), thereby driving the second sealing ring (16) on the discharge port end cover assembly (4) to contact or separate with the material guide eaves (19), so as to achieve sealing or discharging of the discharge port (22).

2. The concrete mixing tank according to claim 1, characterized in that: The feed port end cover assembly (3) comprises an end cover (26), a transition connector (27), a door opening mechanism (28) and a door pressing mechanism (29); the end cover (26) is connected to the first sealing ring (15) so that the first sealing ring (15) is stably located on the lower end surface of the end cover (26); the transition connector (27) is connected to the center of the upper end surface of the end cover (26); an oblong hole (30) is provided on the transition connector (27); the transition connector (27) is connected to the opening mechanism (28) through the oblong hole (30); The door mechanism (28) is connected with the feed inlet end cover assembly (3), a threaded sleeve (31) is provided at the center of the upper side of the door opening mechanism (28), the door pressing mechanism (29) is threadedly connected with the threaded sleeve (31) of the door opening mechanism (28), and the two ends of the door opening mechanism (28) are respectively provided with a first pin sleeve (32) and a second pin sleeve (33), and the feed inlet end cover assembly (3) is respectively connected with the two feed cover ear seat fittings (14) through the first pin sleeve (32) and the second pin sleeve (33) at the two ends of the door opening mechanism (28).

3. The concrete mixing tank according to claim 1 or claim 2, characterized in that: The first sealing ring (15) comprises a large base (34) and a small base (35); the large base (34) is connected to the small base (35); a fillet (36) is provided at the connection between the large base (34) and the small base (35); the outer edge of the small base (35) is provided with a chamfer (37); an array of connecting holes (38) are evenly distributed around the periphery of the first sealing ring (15); the connecting holes (38) vertically penetrate the small base (35) and the large base (34); and the body of the small base (35) is a conical surface (39), that is, the outer diameter of the end of the small base (35) that is integrally connected to the large base (34) is larger than the outer diameter of the end of the small base (35) that is away from the large base (34); and the conical surface (39) of the small base (35) is arranged at an angle to the axial center line of the first sealing ring (15).

4. The concrete mixing tank according to claim 1, characterized in that: The feed cover ear seat assembly (14) comprises an arc-bent plate (40) arranged on the tank body assembly (1), an ear plate (41) arranged on the arc-bent plate (40), and a rib plate (42) arranged inside the ear plate (41), wherein the lower end surface of the rib plate (42) is arranged with a gap between the arc-bent plate (40).

5. The concrete mixing tank according to claim 1, characterized in that: The discharge port end cover assembly (4) further comprises an end cover plate (43) for connecting and fixing the second sealing ring (16) to its inner end surface, an outer flange (44) arranged on the outer edge of the end cover plate (43) and arranged at an angle to the axis of the end cover plate (43), a stepped shaft sleeve (45) arranged concentrically at the center of the end cover plate (43), a guard plate (46) arranged on the outer wall of the stepped shaft sleeve (45) and having one end face abutting against the inner end face of the end cover plate (43), a support plate (47) uniformly arranged in an array on the outer wall of the stepped shaft sleeve (45) and having the outer wall abutting against the end face of the end cover plate (43) and the end face of the outer flange (44), and a stepped shaft sleeve (45) arranged on the outer wall of the stepped shaft sleeve (45) and having the outer wall abutting against the end face of the end cover plate (43) and the end face of the outer flange (44), and a stepped shaft sleeve (45) arranged on the outer wall of the stepped shaft sleeve (45) and having the outer wall abutting against the inner end face of the end cover plate (43). The second sealing ring (16) is fitted with a pressure plate (48), and the pressure plate (48), the second sealing ring (16) and the end cover plate (43) are screwed together, so that the second sealing ring (16) is confined between the pressure plate (48) and the end cover plate (43), and the outer wall of the second sealing ring (16) is provided with a conical surface (49) which is at an angle to the axis of the end cover plate (43); the angle between the conical surface (49) and the axis of the end cover plate (43) is equal to the angle between the outer eaves (44) and the axis of the end cover plate (43), and the angle between the outer eaves (44) and the axis of the end cover plate (43) is equal to the angle between the guide eaves (19) and the axis of the tank body assembly (1); The stepped shaft sleeve (45) is provided with a stepped hole (50) in the axial direction, and the stepped hole (50) includes a third shaft hole (51), a second shaft hole (52) and a first shaft hole (53). The stepped shaft sleeve (45) is provided with a through hole (54) on the side wall of the first shaft hole (53). The stepped shaft sleeve (45) is provided with a stopper at the junction of the second shaft hole (52) and the third shaft hole (51).

6. The concrete mixing tank according to claim 1, characterized in that: The discharge cover clamping mechanism (6) comprises a sleeve body (55) and a crank handle (56) evenly distributed in an array on the outer wall of the sleeve body (55); a thread (57) is provided in the axial direction of the sleeve body (55); a back-off hole (58) is provided at one end of the sleeve body (55) near the self-lubricating bearing (7); and a countersunk hole (59) is also provided on the side wall of the sleeve body (55); a shoulder formed by the thread (57) and the back-off hole (58) enables the sleeve body (55) to limit the self-lubricating bearing (7) through the shoulder; the discharge cover clamping mechanism (6) is connected to the screw shaft (25) of the discharge port opening mechanism (5) through the sleeve body (55), so that the discharge cover clamping mechanism (6) can squeeze the discharge cover end cover (26) assembly to realize the opening and closing of the discharge port (22).

7. The concrete mixing tank according to claim 1, characterized in that: The feed inlet end cover assembly (3) is provided with a second pin sleeve (33), the safety latch mechanism (8) located on the feed inlet end cover assembly (3) comprises a safety bolt (60), a safety pin shaft (61) and a chain (62) composed of a plurality of chain links, the end cover (26) of the feed inlet end cover assembly (3) is provided with a shaft sleeve (63), the shaft sleeve (63) is screwed to the safety bolt (60), one end of the chain (62) is screwed to the end surface of the shaft sleeve (63) through the large diameter end of the safety bolt (60), and the other end is connected to the safety pin shaft (61). The safety pin shaft (61) passes through the second pin sleeve (33) and the feed cover ear seat assembly (14) at the front end of the feed port (21), so that the second pin sleeve (33) is hinged to the feed cover ear seat assembly (14) at the front end of the feed port (21), and the second pin sleeve (33) is also provided with an internal threaded hole (64) on the side wall perpendicular to the safety pin shaft (61), so that the safety bolt in the second pin sleeve can be limited by connecting the bolt to the internal threaded hole, and a socket (65) is also welded on the upper side of the end cover (26), and the socket (65) is used to temporarily place the safety pin shaft (61).

8. The concrete mixing tank according to claim 1, characterized in that: Two spiral stirring blades (66) are evenly distributed on the inner wall of the rear cylinder (12) and are arranged inside the rear cylinder (12).

9. The concrete mixing tank according to claim 1, characterized in that: The number of the spiral blades (13) is at least two groups.

10. The concrete mixing tank according to claim 1, characterized in that: The organic polymer material may be polyurethane.

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