Unloading device and unloading method of tank car

Abstract

The invention provides a unloading device and an unloading method of a tank car, and can solve the problem that when an existing device is adopted to unload a medium, impurities in the medium are easily clamped on a sealing surface of a ball valve, so that a sealing structure of the ball valve is scratched in the opening and closing process, and then a leakage fault of the ball valve occurs. The device comprises an opening and closing locking module and a stop valve with a reset spring, the opening and closing locking module comprises an opening and closing unit, a supporting seat and a locking unit, the opening and closing unit comprises a transmission shaft and an operating handle, one end of the transmission shaft is connected with a driving mechanism, and the other end of the transmission shaft penetrates through the supporting seat and is provided with a connecting and disconnecting structure; the connecting and separating structure is sleeved with the operating handle, so that the operating handle is connected with or separated from the transmission shaft, the supporting seat is provided with a first limiting gear and a second limiting gear, and the first limiting gear and the second limiting gear are located above the operating handle when the stop valve is in a closed state and below the operating handle when the stop valve is in a maximum opening state respectively; the locking device is used for locking the operating handle when the stop valve is in an open state.

Description

Technical Field

[0001] The invention relates to a storage container unloading device and a storage container unloading method, and in particular to a tank truck unloading device and a storage container unloading method. Background Art

[0002] Driven by the Industrial Revolution, a large amount of liquid media needs to be transported by tank trucks. The early loading and unloading methods of liquid media mainly focused on loading and unloading. However, this method has many problems in practice. On the one hand, for large-capacity tank trucks, the efficiency of unloading the medium by unloading is low; on the other hand, there are safety hazards and medium leakage risks during the unloading process. In order to improve the efficiency and safety of tank trucks when unloading media, a lower unloading device is usually used to unload the medium from the bottom of the tank truck. The lower unloading device of the existing tank truck includes a ball valve and two transmission shafts. The ball valve is connected to the bottom flange of the tank body. The two transmission shafts are located on both sides of the bottom of the tank body. One end of the two transmission shafts is connected to the drive shaft of the ball valve. When unloading the medium in the tank body, the ball valve is remotely opened and closed on either side of the tank body by using a wrench that matches the other end of the transmission shaft. However, since the opening and closing function of the ball valve is realized based on the relative sliding between the sealing ring and the sealing surface, the problem when using the existing tank truck unloading device to unload the medium in the tank body is that impurities such as gravel that may exist in the medium are easily stuck on the sealing surface of the ball valve, which can easily cause the sealing structure of the ball valve to be scratched during the opening and closing process, thereby causing the ball valve to leak. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that when the medium in the tank body is unloaded by the existing tank truck unloading device, impurities in the medium are easily stuck on the sealing surface of the ball valve, which easily causes the sealing structure of the ball valve to be scratched during the opening and closing process, thereby causing the ball valve to leak. The present invention provides a tank truck unloading device and unloading method.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A tank truck unloading device, which is special in that:

[0006] It comprises two opening, closing and locking modules arranged opposite to each other and a stop valve with a self-restoring spring arranged between the two opening, closing and locking modules; the stop valve is used to be connected to the bottom flange of the tank body of the tank truck to be unloaded;

[0007] Each of the opening, closing and locking modules comprises an opening and closing unit, a supporting seat and a locking unit;

[0008] The opening and closing unit comprises a transmission shaft and an operating handle; one end of the transmission shaft is connected to the driving mechanism of the stop valve, the other end of the transmission shaft is passed through the support seat and a connecting and disconnecting structure is coaxially arranged at the end; the operating handle is sleeved on the connecting and disconnecting structure to connect or disconnect the operating handle with the transmission shaft;

[0009] The support seat is provided with a first limit gear and a second limit gear, the first limit gear is located above the position of the operating handle when the stop valve is in a closed state, and the second limit gear is located below the position of the operating handle when the stop valve is in a maximum open state, for limiting the rotation angle of the operating handle;

[0010] The locking unit includes a limit handle and at least one limit support; the limit support is arranged on the support seat, the limit handle is passed through the support seat and slidably cooperates with the support seat, the limit support and the limit handle are both located on the inner side of the plane where the operating handle is located when the stop valve is in the open state, and the limit support and the limit handle are used to realize the locking of the operating handle when the stop valve is in the open state.

[0011] Furthermore, a handle installation box is provided on the side wall of the support seat close to the stop valve;

[0012] The limit handle includes a limit vertical rod, a compression spring and at least one limit horizontal rod;

[0013] The side wall of the limit vertical rod is connected to one end of the limit horizontal rod, and the other end of the limit horizontal rod is successively passed through the support seat and the handle installation box and slidably cooperates with the support seat and the handle installation box; the side wall of the limit horizontal rod is provided with a limit convex ring located in the handle installation box;

[0014] The compression spring is sleeved outside the limiting cross bar, one end of the compression spring abuts against the side wall of the support seat, and the other end abuts against the limiting convex ring.

[0015] Furthermore, a handle installation box is provided on the side wall of the support seat close to the stop valve;

[0016] The limit handle includes a limit vertical rod and at least one limit diagonal rod;

[0017] The side wall of the limiting vertical rod is connected to one end of the limiting oblique rod, and the other end of the limiting oblique rod is sequentially penetrated on the support seat and the handle installation box and slidably matched with the support seat and the handle installation box.

[0018] Further, the connection and disengagement structure includes a cylindrical section and a polygonal column section;

[0019] The cylindrical section and the polygonal column section are coaxially arranged in sequence at the other end of the transmission shaft in a direction away from the transmission shaft; the diameter of the inscribed circle of the polygonal column section is larger than the outer diameter of the cylindrical section; and a limit stop ring is arranged at the end of the polygonal column section;

[0020] The operating end of the operating handle is provided with a mounting hole, which is adapted to the polygonal column section and is used to connect the operating handle to the transmission shaft, thereby realizing the opening and closing control of the stop valve by the operating handle; the operating handle is sleeved on the cylindrical section through the mounting hole and is used to disengage the operating handle from the transmission shaft.

[0021] Furthermore, a U-shaped slot is provided on the support seat; the U-shaped slot is used to place an operating handle that is disconnected from the transmission shaft, and the U-shaped slot is located on the inner side of the plane where the operating handle that is connected to the transmission shaft is located.

[0022] Furthermore, there are two limit supports, one of which is arranged close to the connection and separation structure, and the other limit support is located below the limit handle;

[0023] An arc-shaped limiting boss is also arranged on the side wall of the limiting cross bar, and the arc-shaped limiting boss is located on the side of the supporting seat away from the stop valve.

[0024] At the same time, the present invention also provides a tank truck unloading method, which uses the above tank truck unloading device, and its special feature is that it includes the following steps:

[0025] Step 1: Sleeve one of the operating handles on the connecting and disengaging structure so that the operating handle is connected to the corresponding transmission shaft;

[0026] Step 2, rotating the operating handle around the axis of the transmission shaft and in a direction close to the second limit gear, so that the corresponding transmission shaft drives the driving mechanism of the stop valve and drives the other transmission shaft to rotate until the operating handle abuts against the second limit gear, the stop valve is in a maximum open state, and the medium in the tank body is unloaded;

[0027] Step 3: Pull out the limit handle, rotate the operating handle around the axis of the transmission shaft and in a direction away from the second limit gear until the operating handle is limited to the limit handle, and then push the limit handle to press the operating handle against the limit support, so that the operating handle is in a locked state;

[0028] Step 4. After unloading the medium in the tank, pull open the limit handle, rotate the operating handle around the axis of the transmission shaft and in the direction close to the second limit gear, then push the limit handle back, and finally rotate the operating handle around the axis of the transmission shaft and in the direction away from the second limit gear until it is limited to the first limit gear, so that the stop valve is in a closed state, and the unloading operation of the tank truck is completed.

[0029] Further, step 3 specifically includes pulling out the limit handle, rotating the operating handle around the axis of the transmission shaft and in a direction away from the second limit gear until the operating handle is limited to the limit cross bar, and then releasing the limit handle. Under the rebound action of the compression spring, the limit vertical bar presses the operating handle against the limit support, so that the operating handle is in a locked state;

[0030] Specifically, step 4 is as follows: after unloading the medium in the tank body, pull open the limit handle, rotate the operating handle around the axis of the transmission shaft and in the direction close to the second limit gear, then release the limit handle, the limit handle automatically resets under the rebound action of the compression spring, and finally rotate the operating handle around the axis of the transmission shaft and in the direction away from the second limit gear until it is limited to the first limit gear, so that the stop valve is in a closed state, and the unloading operation of the tank truck is completed.

[0031] Further, step 3 specifically includes pulling out the limit handle, rotating the operating handle around the axis of the transmission shaft and in a direction away from the second limit gear until the operating handle is limited to the limit inclined rod, and then releasing the limit handle. Under the action of gravity, the limit vertical rod presses the operating handle onto the limit support, so that the operating handle is in a locked state;

[0032] Specifically, step 4 is as follows: after unloading the medium in the tank body, pull open the limit handle, rotate the operating handle around the axis of the transmission shaft and in the direction close to the second limit gear, then release the limit handle, the limit handle automatically resets under the action of gravity, and finally rotate the operating handle around the axis of the transmission shaft and in the direction away from the second limit gear until it is limited to the first limit gear, so that the stop valve is in a closed state, and the unloading operation of the tank truck is completed.

[0033] Further, step 1 specifically includes rotating one of the operating handles sleeved on the corresponding cylindrical segment around the axis of the corresponding transmission shaft and in a direction close to the first limit gear, so that the operating handle is disengaged from the corresponding U-shaped slot, and then sleeved on the corresponding polygonal column segment, so that the operating handle is connected to the corresponding transmission shaft;

[0034] In step 4, after the stop valve is in a closed state, it also includes the step of placing an operating handle, specifically: pushing the operating handle mounted on the polygonal column section in a direction close to the support seat until the operating handle is mounted on the cylindrical section, so that the operating handle is disengaged from the transmission shaft, and then rotating the operating handle around the axis of the transmission shaft and in a direction away from the first limit gear until it is placed in the corresponding U-shaped slot.

[0035] Beneficial effects of the present invention:

[0036] 1. The present invention provides a tank truck unloading device and unloading method, wherein, compared with a ball valve, since the opening and closing process of the stop valve does not involve the problem of "relative sliding between a sealing ring and a sealing surface", the sealing surface will not be scratched by impurities such as gravel in the tank truck medium; and the stop valve in the present invention has a restoring spring, which has a stronger compensating effect on the wear of the valve seal, so the airtightness of the stop valve is almost not affected by the wear of the valve seal, so the present invention can avoid the problem of valve leakage failure.

[0037] 2. In the present invention, since the connection and disconnection structure is provided, the operating handle can be connected or disconnected from the transmission shaft, so that the opening, closing and locking operations of the stop valve can be performed on either side of the tank truck and are not affected by related structures such as the operating handle on the other side.

[0038] 3. Since the present invention is provided with a limit handle and a limit support, the operating handle can be locked, and the locking operation is not affected by the clamping force transmitted to the operating handle by the restoring spring (that is, in the locking operation, what moves axially along the transmission shaft is the limit handle that is not affected by the clamping force, not the operating handle that is affected by the clamping force).

[0039] 4. In the present invention, the limit handle includes a compression spring, so that the limit handle has an automatic reset function, which is convenient and reliable to use.

[0040] 5. In the present invention, the limit handle includes a limit inclined rod, and the automatic resetting function of the limit handle is realized by gravity.

[0041] 6. Since the cylindrical section and the U-shaped groove are provided in the present invention, the operating handle will not generate vibration interference to the stop valve in the closed state (that is, when the stop valve is in the closed state, the operating handle is disengaged from the transmission shaft, and the operating handle is placed in the U-shaped groove, and its own vibration generated by the operation of the tank truck will not be transmitted to the stop valve).

[0042] 7. The arc-shaped limiting boss in the present invention is conducive to operating the limiting handle.

[0043] 8. The method of the present invention is simple to operate and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a three-dimensional structural schematic diagram of a tank truck unloading device of the present invention;

[0045] Figure 2 The structure of the opening and closing locking module in the embodiment of the present invention is shown in FIG. Figure 1 (The operating handle is in locked state);

[0046] Figure 3 The structure of the opening and closing locking module in the embodiment of the present invention is shown in FIG. Figure 2(The operating handle is in unlocked state);

[0047] Figure 4 It is a schematic diagram of the installation structure of the limit handle, the handle installation box and the support seat in an embodiment of the present invention;

[0048] Figure 5 It is a schematic diagram of the installation structure of the limit handle, the handle installation box and the support seat in other embodiments of the present invention;

[0049] Figure 6 It is a schematic diagram of the structure of the operating handle, the connecting and disconnecting structure and the transmission shaft in an embodiment of the present invention;

[0050] Figure 7 is a schematic structural diagram of an operating handle in an embodiment of the present invention;

[0051] Figure 8 It is a structural schematic diagram of an opening and closing locking module in an embodiment of a tank truck unloading method of the present invention when it is in an initial state;

[0052] Fig. 9 yes Figure 8 A top view of

[0053] Fig.10 It is a structural schematic diagram of the opening and closing locking module when the stop valve is in the maximum open state in step 2 of an embodiment of a tank truck unloading method of the present invention;

[0054] Fig.11 It is a structural schematic diagram of an opening and closing locking module when the operating handle is in a locked state in step 3 of an embodiment of a tank truck unloading method of the present invention;

[0055] Fig.12 It is a structural schematic diagram of the opening and closing locking module when the stop valve is in a closed state in step 4 of an embodiment of a tank truck unloading method of the present invention.

[0056] Description of reference numerals:

[0057] 1-opening and closing locking module, 2-stop valve, 3-support seat, 4-opening and closing unit, 41-transmission shaft, 42-operating handle, 43-mounting hole, 5-locking unit, 52-limiting handle, 53-limiting support, 6-connection and disengagement structure, 61-cylindrical section, 62-polygonal column section, 63-limiting retaining ring, 7-first limiting gear, 8-handle mounting box, 9-second limiting gear, 10-limiting vertical rod, 11-compression spring, 12-limiting horizontal rod, 13-limiting oblique rod, 14-U-shaped slot, 15-arc-shaped limiting boss, 16-limiting convex ring. DETAILED DESCRIPTION

[0058] like Figure 1As shown, a tank truck unloading device comprises two opening and closing locking modules 1 arranged opposite to each other and a stop valve 2 with a self-restoring spring arranged between the two opening and closing locking modules 1, and the stop valve 2 is used to be connected to the bottom flange of the tank body of the tank truck to be unloaded. Specifically, as Figure 1-Figure 7 As shown, each opening and closing locking module 1 includes an opening and closing unit 4, a support seat 3 and a locking unit 5; wherein the opening and closing unit 4 includes a transmission shaft 41 and an operating handle 42, one end of the transmission shaft 41 is connected to the driving mechanism of the stop valve 2, the other end of the transmission shaft 41 is penetrated on the support seat 3 and a connecting and disconnecting structure 6 is coaxially arranged at the end, the connecting and disconnecting structure 6 includes a cylindrical section 61 and a multi-prism section 62, and the cylindrical section 61 and the multi-prism section 62 are coaxially arranged on the transmission shaft 4 in a direction away from the transmission shaft 41. 1, the inscribed circle diameter of the polygonal column section 62 is larger than the outer diameter of the cylindrical section 61, and a limit stop ring 63 is provided at the end of the polygonal column section 62; a mounting hole 43 is provided at the action end of the operating handle 42, and the mounting hole 43 is adapted to the polygonal column section 62, and is used to connect the operating handle 42 with the transmission shaft 41, so as to realize the opening and closing control of the stop valve 2 by the operating handle 42, and the operating handle 42 is sleeved on the cylindrical section 61 through the mounting hole 43, and is used to disengage the operating handle 42 from the transmission shaft 41. A first limit stop 7, a second limit stop 9 and a U-shaped slot 14 are provided on the support seat 3, and the first limit stop 7 is located above the position of the operating handle 42 when the stop valve 2 is in the closed state, and the second limit stop 9 is located below the position of the operating handle 42 when the stop valve 2 is in the maximum open state, and is used to limit the rotation angle of the operating handle 42. Figure 8-Figure 9As shown, the U-shaped card slot 14 is used to place the operating handle 42 in a disengaged state from the transmission shaft 41, and the U-shaped card slot 14 is located on the inner side of the plane where the operating handle 42 in a connected state with the transmission shaft 41 is located. A handle mounting box 8 is provided on the side wall of the support seat 3 close to the stop valve 2. The locking unit 5 includes a limit handle 52 and two limit supports 53, wherein the limit handle 52 includes a limit vertical rod 10, two compression springs 11 and two limit cross rods 12, one end of the two limit cross rods 12 is connected to the side wall of the limit vertical rod 10 side by side, and the other end is successively penetrated on the support seat 3 and the handle mounting box 8 and slidably cooperates with the support seat 3 and the handle mounting box 8, and a limit convex ring 16 located in the handle mounting box 8 is provided on the side wall of each limit cross rod 12, and two compression springs 11 are respectively sleeved outside the two limit cross rods 12, and one end of each compression spring 11 abuts against the side wall of the support seat 3, and the other end abuts against the corresponding limit convex ring 16. An arc-shaped limit boss 15 is also provided on the side wall of each limit cross bar 12, and the arc-shaped limit boss 15 is located on the side of the support seat 3 away from the stop valve 2. Two limit supports 53 are provided on the support seat 3, and the limit supports 53 and the limit handle 52 are both located on the inner side of the plane where the operating handle 42 is located when the stop valve 2 is in the open state, one limit support 53 is provided close to the connection and separation structure 6, and the other limit support 53 is located below the limit handle 52, and the limit support 53 and the limit handle 52 are used to realize the locking of the operating handle 42 when the stop valve 2 is in the open state.

[0059] In other embodiments, the limit handle 52 includes a limit vertical rod 10 and two limit diagonal rods 13, one end of the two limit diagonal rods 13 are connected side by side to the side walls of the limit vertical rod 10, and the other ends are successively passed through the support seat 3 and the handle mounting box 8 and slidably cooperate with the support seat 3 and the handle mounting box 8.

[0060] This embodiment also provides a tank truck unloading method, using the tank truck unloading device, comprising the following steps:

[0061] Step 1. Rotate one of the operating handles 42 sleeved on the corresponding cylindrical segment 61 around the axis of the corresponding transmission shaft 41 and in a direction close to the first limit gear 7, so that the operating handle 42 disengages from the corresponding U-shaped slot 14, and then sleeve the operating handle 42 on the corresponding polygonal column segment 62 through the mounting hole 43, so that the operating handle 42 is connected to the corresponding transmission shaft 41.

[0062] Step 2: Figure 1 , Figure 3 and Fig.10As shown, the operating handle 42 is rotated around the axis of the transmission shaft 41 and in the direction close to the second limit gear 9, so that the corresponding transmission shaft 41 drives the driving mechanism of the stop valve 2 and drives the other transmission shaft 41 to rotate until the operating handle 42 abuts against the second limit gear 9, the stop valve 2 is in the maximum open state, and the medium in the tank body is unloaded.

[0063] Step 3: Figure 2 and Fig.11 As shown, pull out the limit handle 52, rotate the operating handle 42 around the axis of the transmission shaft 41 and in the direction away from the second limit gear 9 until the operating handle 42 is limited to the limit cross bar 12, and then release the limit handle 52. Under the rebound action of the compression spring 11, the limit vertical rod 10 presses the operating handle 42 against the limit support 53, so that the operating handle 42 is in a locked state.

[0064] Step 4: Fig.12 As shown, after unloading the medium in the tank body, pull open the limit handle 52, rotate the operating handle 42 around the axis of the transmission shaft 41 and in the direction close to the second limit gear 9, then release the limit handle 52, the limit handle 52 automatically resets under the rebound action of the compression spring 11, and then rotate the operating handle 42 around the axis of the transmission shaft 41 and in the direction away from the second limit gear 9 until it is limited to the first limit gear 7, so that the stop valve 2 is in a closed state, and finally push the operating handle 42 sleeved on the multi-prism section 62 in the direction close to the support seat 3, until the operating handle 42 is sleeved on the cylindrical section 61 of the connection and separation structure 6 through the mounting hole 43, so that the operating handle 42 is separated from the transmission shaft 41, and then rotate the operating handle 42 around the axis of the transmission shaft 41 and in the direction away from the first limit gear 7 until it is placed in the corresponding U-shaped card slot 14, completing the unloading operation of the tank truck. In this embodiment, the multi-prism section 62 is a square prism structure, and the mounting hole 43 is a square hole.

[0065] In other embodiments, step 3 specifically includes pulling out the limit handle 52, rotating the operating handle 42 around the axis of the transmission shaft 41 and in a direction away from the second limit gear 9 until the operating handle 42 is limited to the limit diagonal rod 13, and then releasing the limit handle 52. Under the action of gravity, the limit vertical rod 10 presses the operating handle 42 against the limit support 53, so that the operating handle 42 is in a locked state.

[0066] Step 4 specifically comprises: after unloading the medium in the tank body, pulling open the limit handle 52, rotating the operating handle 42 around the axis of the transmission shaft 41 and in a direction close to the second limit gear 9, and then releasing the limit handle 52, the limit handle 52 automatically resets under the action of gravity, and then rotating the operating handle 42 around the axis of the transmission shaft 41 and in a direction away from the second limit gear 9 until it is limited to the first limit gear 7, so that the stop valve 2 is in a closed state, and finally pushing the operating handle 42 sleeved on the multi-prism section 62 in a direction close to the support seat 3 until the operating handle 42 is sleeved on the cylindrical section 61 of the connection and separation structure 6 through the mounting hole 43, so that the operating handle 42 is separated from the transmission shaft 41, and then rotating the operating handle 42 around the axis of the transmission shaft 41 and in a direction away from the first limit gear 7 until it is placed in the corresponding U-shaped slot 14, at which time the operating handle 42 returns to its initial state, and the unloading operation of the tank truck is completed.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tank truck unloading device, characterized in that: It comprises two opening, closing and locking modules (1) arranged opposite to each other and a stop valve (2) with a self-restoring spring arranged between the two opening, closing and locking modules (1); the stop valve (2) is used to be connected to the bottom flange of the tank body of the tank truck to be unloaded; Each of the opening, closing and locking modules (1) comprises an opening and closing unit (4), a support seat (3) and a locking unit (5); The opening and closing unit (4) comprises a transmission shaft (41) and an operating handle (42); one end of the transmission shaft (41) is connected to the driving mechanism of the stop valve (2), the other end of the transmission shaft (41) is inserted into the support seat (3) and a connecting and disconnecting structure (6) is coaxially arranged at the end; the operating handle (42) is sleeved on the connecting and disconnecting structure (6) and is used to connect or disconnect the operating handle (42) with the transmission shaft (41); The support seat (3) is provided with a first limit gear (7) and a second limit gear (9), the first limit gear (7) being located above the position of the operating handle (42) when the stop valve (2) is in a closed state, and the second limit gear (9) being located below the position of the operating handle (42) when the stop valve (2) is in a maximum open state, for limiting the rotation angle of the operating handle (42); The locking unit (5) comprises a limit handle (52) and at least one limit support (53); the limit support (53) is arranged on the support seat (3), the limit handle (52) is passed through the support seat (3) and slidably cooperates with the support seat (3), the limit support (53) and the limit handle (52) are both located on the inner side of the plane where the operating handle (42) is located when the stop valve (2) is in the open state, and the limit support (53) and the limit handle (52) are used to realize the locking of the operating handle (42) when the stop valve (2) is in the open state.

2. The unloading device of the tank truck according to claim 1, characterized in that: A handle installation box (8) is provided on the side wall of the support seat (3) close to the stop valve (2); The limiting handle (52) comprises a limiting vertical rod (10), a compression spring (11) and at least one limiting horizontal rod (12); The side wall of the limiting vertical rod (10) is connected to one end of the limiting cross rod (12), and the other end of the limiting cross rod (12) is successively inserted into the support seat (3) and the handle installation box (8) and slidably cooperates with the support seat (3) and the handle installation box (8); a limiting convex ring (16) located in the handle installation box (8) is arranged on the side wall of the limiting cross rod (12); The compression spring (11) is sleeved outside the limiting cross bar (12), one end of the compression spring (11) abuts against the side wall of the support seat (3), and the other end abuts against the limiting convex ring (16).

3. The unloading device of the tank truck according to claim 1, characterized in that: A handle installation box (8) is provided on the side wall of the support seat (3) close to the stop valve (2); The limiting handle (52) comprises a limiting vertical rod (10) and at least one limiting oblique rod (13); The side wall of the limiting vertical rod (10) is connected to one end of the limiting oblique rod (13), and the other end of the limiting oblique rod (13) is successively inserted into the support seat (3) and the handle installation box (8) and slidably cooperates with the support seat (3) and the handle installation box (8).

4. The unloading device of the tank truck according to claim 1, 2 or 3, characterized in that: The connecting and disengaging structure (6) comprises a cylindrical section (61) and a polygonal column section (62); The cylindrical section (61) and the polygonal column section (62) are coaxially arranged in sequence at the other end of the transmission shaft (41) in a direction away from the transmission shaft (41); the diameter of the inscribed circle of the polygonal column section (62) is larger than the outer diameter of the cylindrical section (61); and a limit stop ring (63) is arranged at the end of the polygonal column section (62); The operating end of the operating handle (42) is provided with a mounting hole (43), which is matched with the multi-prism section (62) and is used to connect the operating handle (42) with the transmission shaft (41), so as to realize the opening and closing control of the stop valve (2) by the operating handle (42); the operating handle (42) is sleeved on the cylindrical section (61) through the mounting hole (43) and is used to separate the operating handle (42) from the transmission shaft (41).

5. The unloading device for a tank truck according to claim 4, characterized in that: The support seat (3) is also provided with a U-shaped slot (14); the U-shaped slot (14) is used to accommodate an operating handle (42) that is in a state of being disconnected from the transmission shaft (41), and the U-shaped slot (14) is located on the inner side of the plane where the operating handle (42) that is in a state of being connected to the transmission shaft (41) is located.

6. The unloading device of a tank truck according to claim 2, characterized in that: There are two limit supports (53), one limit support (53) is arranged close to the connection and separation structure (6), and the other limit support (53) is located below the limit handle (52); An arc-shaped limiting boss (15) is also provided on the side wall of the limiting cross bar (12), and the arc-shaped limiting boss (15) is located on the side of the support seat (3) away from the stop valve (2).

7. A method for unloading a tank truck, using the unloading device for a tank truck according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: sleeve one of the operating handles (42) onto the connecting and disconnecting structure (6) so that the operating handle (42) is connected to the corresponding transmission shaft (41); Step 2, rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction close to the second limit gear (9), so that the corresponding transmission shaft (41) drives the driving mechanism of the stop valve (2) and drives the other transmission shaft (41) to rotate until the operating handle (42) abuts against the second limit gear (9), the stop valve (2) is in a maximum open state, and the medium in the tank body is unloaded; Step 3, pull out the limit handle (52), rotate the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until the operating handle (42) is limited to the limit handle (52), and then push the limit handle (52) to press the operating handle (42) against the limit support (53), so that the operating handle (42) is in a locked state; Step 4: After unloading the medium in the tank body, pull open the limit handle (52), rotate the operating handle (42) around the axis of the transmission shaft (41) and in a direction close to the second limit gear (9), then push back the limit handle (52), and finally rotate the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until it is limited to the first limit gear (7), so that the stop valve (2) is in a closed state, and the unloading operation of the tank truck is completed.

8. The method for unloading a tanker according to claim 7, characterized in that: Step 3 specifically includes pulling out the limit handle (52), rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until the operating handle (42) is limited to the limit cross bar (12), and then releasing the limit handle (52). Under the rebound action of the compression spring (11), the limit vertical bar (10) presses the operating handle (42) against the limit support (53), so that the operating handle (42) is in a locked state; Step 4 specifically comprises the following steps: after the medium in the tank body is unloaded, the limit handle (52) is pulled open, the operating handle (42) is rotated around the axis of the transmission shaft (41) and in a direction close to the second limit gear (9), and then the limit handle (52) is released. The limit handle (52) is automatically reset under the rebound action of the compression spring (11), and finally the operating handle (42) is rotated around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until it is limited to the first limit gear (7), so that the stop valve (2) is in a closed state, and the unloading operation of the tank truck is completed.

9. The method for unloading a tanker according to claim 7, characterized in that: Step 3 specifically includes pulling out the limit handle (52), rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until the operating handle (42) is limited by the limit inclined rod (13), and then releasing the limit handle (52). Under the action of gravity, the limit vertical rod (10) presses the operating handle (42) against the limit support (53), so that the operating handle (42) is in a locked state; Step 4 specifically comprises: after unloading the medium in the tank body, pulling open the limit handle (52), rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction close to the second limit gear (9), then releasing the limit handle (52), the limit handle (52) automatically resets under the action of gravity, and finally rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the second limit gear (9) until it is limited to the first limit gear (7), so that the stop valve (2) is in a closed state, and the unloading operation of the tank truck is completed.

10. The method for unloading a tanker according to claim 8 or 9, characterized in that: Step 1 specifically comprises rotating one of the operating handles (42) sleeved on the corresponding cylindrical section (61) around the axis of the corresponding transmission shaft (41) and in a direction close to the first limit gear (7), so that the operating handle (42) is disengaged from the corresponding U-shaped slot (14), and then sleeved on the corresponding multi-prism section (62), so that the operating handle (42) is connected to the corresponding transmission shaft (41); In step 4, after the stop valve (2) is in the closed state, the step of placing the operating handle (42) is further included, which is specifically: pushing the operating handle (42) sleeved on the multi-prism section (62) in a direction close to the support seat (3) until the operating handle (42) is sleeved on the cylindrical section (61), so that the operating handle (42) is disengaged from the transmission shaft (41), and then rotating the operating handle (42) around the axis of the transmission shaft (41) and in a direction away from the first limit gear (7) until it is placed in the corresponding U-shaped slot (14).

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