A mold for casting aluminum alloy motor shell of new energy vehicles

Abstract

The invention relates to the technical field of aluminum alloy motor shell casting, and in particular to a mold for casting an aluminum alloy motor shell for a new energy vehicle, comprising a fixed mold plate, a fixed mold core, a movable mold core and a driving mold; a mold opening mechanism is arranged on the side of a lower mold module, the mold opening mechanism comprises a mold opening seat, and the mold opening seat is provided with a demoulding column which can be longitudinally away from or close to an upper mold module; when the mold needs to be opened, the fixed mold core and the movable mold core are separated, and the product will adhere to the movable mold core, and then the demoulding column of the mold opening seat can pass through the movable mold plate to the movable mold core and eject the product of the movable mold core to realize demoulding; a heat dissipation structure is arranged between an upper mold module and a lower mold module; the heat dissipation structure is integrated between a guide rod and a movable mold plate, the occupied space is greatly reduced, the overall structure is simple, and it is only necessary to open the mold at the corresponding guide rod and the movable mold plate to form a cavity for the flow of coolant. Compared with traditional air-cooled heat dissipation, water-cooled heat dissipation has a better heat dissipation effect and can quickly discharge the internal heat to the outside.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy motor casing casting, and in particular to a mold for casting an aluminum alloy motor casing for a new energy vehicle. Background Art

[0002] Casting is the most basic method for producing aluminum alloy motor housings. Casting aluminum alloy is an aluminum alloy that fills a casting mold with molten metal to obtain various shapes of parts. It has the advantages of low density, high specific strength, good corrosion resistance and casting processability, and little restriction on part structure design.

[0003] A water-cooled motor is a motor that uses water cooling to dissipate heat. It is usually composed of a stator, a rotor, a housing with water channels, and a cooling water supply source. When it is working, the cooling water circulates through the water channels of the motor housing to take away the heat generated inside the motor. It has good heat dissipation effect, high power density, long life, low noise, and high reliability, so it has a good application prospect in new energy vehicles.

[0004] A Chinese patent with application number CN202321213497.6 discloses a motor housing casting mold, in which a cooling water flow channel is arranged above the water channel core in the side mold, and the cooling of the thick and large parts is enhanced under the existing temperature range to reduce the temperature of this range; the insulation cover is arranged in the mounting hole of the insulation base, wherein the lower end of the insulation cover has a riser groove connected to the casting cavity, and the top and sides of the riser groove are filled with insulation material, thereby effectively improving the temperature of the riser interval, thereby increasing the temperature difference between the two intervals, so that the riser part can effectively compensate for the shrinkage of the thick and large parts, thereby improving the product qualification rate.

[0005] Due to the large amount of heat generated during casting, the inside of the mold needs to be cooled before demolding to speed up the demolding of the molded accessories. Since most of the existing heat dissipation modes mainly use air cooling, the wind of the air cooling cannot enter the inside of the mold, resulting in the internal heat cannot be discharged in time, and the heat dissipation effect is relatively general; in addition, the existing casting mold is inconvenient to demold, resulting in the product stuck in the casting mold cannot be removed in time, affecting production efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a mold for casting an aluminum alloy motor housing for new energy vehicles in view of the deficiencies in the prior art.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A mold for casting an aluminum alloy motor shell of a new energy vehicle, comprising an upper mold module and a lower mold module, a guide structure is arranged between the upper mold module and the lower mold module, the guide structure comprises a guide rod installed on the upper mold module, and the upper mold module and the lower mold module are respectively formed with guide holes that slide with the guide rod;

[0009] The upper mold assembly includes a fixed mold assembly plate and a fixed mold core;

[0010] The lower mold module includes a movable mold plate, a movable mold core and a driving module;

[0011] The dynamic mold core comprises a bottom mold core, a first side mold core, a second side mold core and a third side mold core, wherein the bottom mold core is installed on the dynamic mold plate; the first side mold core, the second side mold core and the third side mold core are continuously close to the bottom mold core and then enclosed to form a mold cavity of a product;

[0012] The driving module comprises a first driving assembly for driving the first side mold core to reciprocate, a second driving assembly for driving the second side mold core to reciprocate, and a third driving assembly for driving the third side mold core to reciprocate;

[0013] A mold opening mechanism is arranged beside the lower mold module, and the mold opening mechanism includes a mold opening bracket arranged longitudinally, the mold opening bracket is equipped with a lifting seat that can longitudinally move away from or approach the upper mold module, the lifting seat is equipped with a transverse bracket arranged transversely, the transverse bracket is equipped with a longitudinally arranged mold opening seat, and the mold opening seat is equipped with a connecting frame connected to the movable mold assembly plate; the mold opening seat is equipped with a demoulding column that can longitudinally move away from or approach the upper mold module, and the demoulding column can pass through the movable mold assembly plate into the movable mold core and eject the product of the movable mold core;

[0014] A heat dissipation structure is provided between the upper die module and the lower die module, the heat dissipation structure comprises a lower die heat dissipation cavity provided in the movable die plate, the lower die heat dissipation cavity is formed with a cooling cavity for water cooling liquid to pass through, the lower die heat dissipation cavity is also formed with a water cooling inlet for water cooling liquid to enter the cooling cavity and a water cooling outlet for water cooling liquid to be discharged, one guide hole is connected with the water cooling inlet, and the other guide hole is connected with the water cooling outlet;

[0015] The movable template is also provided with a connecting cavity, the connecting cavity is provided with a swingable blocking plate, and the blocking plate is provided with a sealing block matched with the water cooling inlet;

[0016] The guide rod is formed with a water-cooling cavity with a hollow structure. The cross-section of the water-cooling cavity is annular. A rotatable arc block is installed in the water-cooling cavity. One guide rod is formed with a water-cooling input port coaxially matched with the water-cooling inlet port, and the other guide rod is formed with a water-cooling output port coaxially matched with the water-cooling outlet port.

[0017] Beneficial effects of the present invention:

[0018] 1. Pass the water-cooling liquid into the water-cooling input port of one of the guide rods so that the water-cooling liquid can flow through the water-cooling cavity. The water-cooling liquid passes through the water-cooling input port and cooperates with the water-cooling inlet port of the lower mold heat dissipation cavity. The water-cooling liquid can enter the cooling cavity of the lower mold heat dissipation cavity. Since the movable mold plate is in direct contact with the movable mold core, the heat of the movable mold core will be transmitted to the movable mold plate. The cooling cavity can continuously transmit the heat of the movable mold plate to the outside through the coolant to achieve heat exchange, thereby reducing the temperature of the movable mold plate and reducing the temperature inside the mold;

[0019] 2. This solution integrates the heat dissipation structure between the guide rod and the moving platen, which greatly reduces the space occupied, and does not require large mechanical structures such as brackets to be arranged outside the mold. The overall structure is simple, and it is only necessary to open the mold on the corresponding guide rod and the moving platen to form a cavity for the coolant to flow, which greatly reduces the cost. Compared with traditional air cooling, water cooling has a better heat dissipation effect, which can quickly discharge the internal heat to the outside and achieve a rapid cooling effect;

[0020] 3. When the mold needs to be opened, the connecting frame installed on the mold opening seat is connected to the movable mold plate, and the lifting and moving seat moves longitudinally, so that the movable mold plate can be away from the upper mold, so as to achieve the mold opening effect. Then the fixed mold core and the movable mold core are separated, and the product will stick to the movable mold core. Then the demolding column of the mold opening seat can pass through the movable mold plate to the movable mold core and eject the product of the movable mold core to achieve demolding and prevent the product from sticking to the movable mold core, so as to achieve better mold opening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the cooperation between the mold and the mold opening mechanism.

[0022] Figure 2 This is a structural schematic diagram of the cooperation between the mold and the mold opening mechanism from another perspective.

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the connecting frame.

[0024] Figure 4 It is a structural schematic diagram of the connection between the mold base and the connecting frame.

[0025] Figure 5 It is a structural schematic diagram of the connection between the mold opening bracket and the lifting motion seat.

[0026] Figure 6 It is a schematic diagram of the structure when the upper mold and the lower mold assembly are separated.

[0027] Figure 7 Schematic diagram of the explosion structure of the upper die assembly. Figure 8 It is a structural schematic diagram of the lower mold module.

[0028] Fig. 9 It is a structural schematic diagram of the connection between the moving template and the moving model core.

[0029] Fig.10 It is a schematic diagram of the cross-sectional structure of the lower mold heat dissipation structure.

[0030] Fig.11 It is a schematic diagram of the cross-sectional structure of the upper mold heat dissipation structure.

[0031] Fig.12 Schematic diagram of the cross-sectional structure of the guide rod.

[0032] Fig.13 It is a schematic diagram of the cross-sectional structure of the lower mold heat dissipation structure in the front view direction.

[0033] Fig.14 for Fig.13 A partial enlarged view of . Fig.15 It is a schematic diagram of the cross-sectional structure of the movable column.

[0034] Reference numerals include:

[0035] 1- Upper die set,

[0036] 10-fixed die plate, 11-fixed die seat plate, 12-flow channel plate, 13-fixed die plate,

[0037] 14-fixed model core, 15-fixed model cavity, 16-main flow channel, 17-second branch flow channel, 18-glue injection port, 2-lower mold module, 21-movable mold module plate, 22-movable mold seat plate, 23-pad, 24-movable mold plate,

[0038] 25-clip groove, 26-hook groove, 27-mold removal hole, 28-guide hole

[0039] 3-Moving model core,

[0040] 31- bottom mold core, 32- first side mold core, 33- second side mold core, 34- third side mold core,

[0041] 4-first drive assembly, 401-second drive assembly, 402-third drive assembly,

[0042] 40-first slide seat, 41-first telescopic cylinder, 42-inclined groove, 43-first sliding guide block,

[0043] 44-first cylinder fixing plate, 45-second telescopic cylinder, 46-second slide seat, 47-second transverse groove, 48-second sliding guide block, 49-second cylinder fixing plate,

[0044] 5-Lower mold heat dissipation structure,

[0045] 51-lower mold heat dissipation cavity, 52-cooling cavity, 53-water cooling inlet, 54-water cooling outlet,

[0046] 55-connecting cavity, 56-blocking plate, 57-sealing block, 58-water cooling cavity,

[0047] 6- Closing mechanism,

[0048] 61-sliding groove, 62-sliding block, 63-stop block, 64-internal compression spring, 65-movable hole,

[0049] 66-movable column, 67-external compression spring, 68-internal connection block, 69-external connection block,

[0050] 7-Connecting channels,

[0051] 71-metal connecting wire, 72-upper guide roller, 73-lower guide roller, 74-height adjustment mechanism,

[0052] 75-active cavity, 76-transverse hole, 77-adjusting hole, 78-threaded sleeve, 79-inner groove,

[0053] 8-Adjustment rod,

[0054] 81- bottom rod, 82- top rod, 83- telescopic hole, 84- fitting block, 85- stop bar,

[0055] 86-expansion structure, 87-rotation handle, 88-water cooling input port, 89-water cooling output port,

[0056] 9- Upper mold heat dissipation structure,

[0057] 91-fixed mold heat conduction cavity, 92-upper mold inlet, 93-upper mold outlet, 94-guide rod,

[0058] 95-insertion port, 96-sealing guide sleeve, 97-internal sleeve, 98-arc block, 99-limit block,

[0059] 100-Mold opening mechanism,

[0060] 101-mold opening bracket, 102-lifting motion seat, 103-first linear module, 104-second linear module, 105-longitudinal guide rail, 106-lateral bracket, 107-mold opening seat, 108-mold stripping sliding seat,

[0061] 109-connecting column, 110-connecting frame, 111-transverse opening template, 112-connecting seat, 113-clamping block, 114-hook plate, 115-transverse telescopic cylinder, 116-opening mold lifting cylinder, 117-bottom movable sleeve, 118-top hole, 119-top movable sleeve, 120-rotating mechanism, 121-first mounting plate,

[0062] 122-second mounting plate, 123-rotating shaft, 124-annular groove, 125-limiting sliding block,

[0063] 126-servo motor, 127-reducer, 128-demolding column. DETAILED DESCRIPTION

[0064] The present invention is described in detail below with reference to the accompanying drawings.

[0065] like Figure 1-15 As shown, a mold for casting an aluminum alloy motor shell for new energy vehicles includes an upper mold module 1 and a lower mold module 2. A guide structure is arranged between the upper mold module 1 and the lower mold module 2. The guide structure includes a guide rod 94 installed on the upper mold module 1. The upper mold module 1 and the lower mold module 2 are respectively formed with guide holes 28 that slide with the guide rod 94; the lower mold module 2 can move axially along the guide rod 94 through the guide hole 28, approaching or moving away from the upper mold module 1.

[0066] The upper mold assembly 1 includes a fixed mold assembly plate 10 and a fixed mold core 14 . The fixed mold core 14 is installed on one surface of the fixed mold assembly plate 10 . The fixed mold core 14 is installed on the bottom surface of the fixed mold assembly plate 10 . A fixed mold cavity 15 is formed on the bottom surface of the fixed mold core 14 .

[0067] Specifically, the fixed mold assembly plate 10 includes a fixed mold base plate 11, a flow channel plate 12 and a fixed mold plate 13 connected in sequence, and a fixed mold core 14 is arranged on a surface of the fixed mold plate 13 away from the connecting plate. The fixed mold base plate 11 is provided with a main flow channel 16, the flow channel plate 12 is provided with a plurality of first branch flow channels all connected to the main flow channel 16, the flow channel plate 12 is provided with a plurality of second branch flow channels 17 respectively connected to each first branch flow channel, and the fixed mold core 14 is provided with a plurality of injection ports 18 all connected to the cavity, and the injection ports 18 are connected to the second branch flow channels 17. This embodiment injects glue into the mold cavity of the product from multiple different positions, effectively avoiding the problems of shrinkage, bright printing, air marks, dragging and flashing of the product in the process of casting the new energy motor shell.

[0068] The lower mold assembly 2 includes a movable mold assembly plate 21, a movable mold core 3 and a sliding mold assembly. The movable mold assembly plate 21 includes a movable mold base plate 22, a pad plate 23 and a movable mold plate 24, and the movable mold core 3 is located on the top of the movable mold plate 24. The movable mold core 3 includes a bottom mold core 31, a first side mold core 32, a second side mold core 33 and a third side mold core 34. The bottom mold core 31 is installed on the movable mold plate 24. The sliding mold assembly includes a driving component that drives the first side mold core 32, the second side mold core 33 and the third side mold core 34 to move toward or away from the movable mold core 3.

[0069] When the mold is closed, the driving assembly can drive the slide to move toward the bottom mold core 31, and the first side mold core 32, the second side mold core 33 and the third side mold core 34 continue to approach the bottom mold core 31, and then cooperate with the fixed mold core 14 to enclose a product cavity.

[0070] When the mold is separated, the lower mold assembly 2 moves toward the side away from the upper mold assembly 1 , and the driving assembly drives the slide to move away from the bottom mold core 31 to display the cast product on the bottom mold core 31 .

[0071] The driving assembly includes a first driving assembly 4, which includes a first telescopic cylinder 41 obliquely mounted on the movable platen 24. The movable platen 24 is provided with an inclined groove 42 for the slide to slide obliquely. The slide and the first side mold core 32 can slide along the inclined groove 42. First sliding guide blocks 43 are installed on both sides of the inclined groove 42. The first sliding guide blocks 43 are arranged along the sliding direction of the slide. Under the drive of the first telescopic cylinder 41, the first side mold core 32 can slide along the inclined groove 42, move close to or away from the bottom mold core 31, and realize mold closing and mold opening.

[0072] Preferably, there are two first sliding guide blocks 43, which are respectively arranged on both sides of the sliding direction of the slide seat; a first cylinder fixing plate 44 is installed between the two first sliding guide blocks 43; the body of the first telescopic cylinder 41 is installed on the first cylinder fixing plate 44; and the piston rod of the first telescopic cylinder 41 passes through the first cylinder fixing plate 44 and is connected to the slide seat.

[0073] The drive assembly also includes a second drive assembly 401, which is arranged transversely and perpendicularly to the first drive assembly 4. The second drive assembly 401 includes a transversely arranged second telescopic cylinder 45, a second slide 46 is installed at the driving end of the second cylinder, the second side mold core 33 is installed on the second slide 46, and the movable mold plate 24 is provided with a second transverse groove 47 for the second slide 46 to slide transversely. Both the second slide 46 and the second side mold core 33 can slide along the second transverse groove 47. Second sliding guide blocks 48 are installed on both sides of the second transverse groove 47, and the second sliding guide blocks 48 are arranged along the sliding direction of the second slide 46. Driven by the second telescopic cylinder 45, the second side mold core 33 can slide along the second transverse groove 47, move close to or away from the bottom mold core 31, and realize mold closing and mold opening.

[0074] Preferably, there are two second sliding guide blocks 48, which are respectively arranged on both sides of the sliding direction of the second slide seat 46; a second cylinder fixing plate 49 is installed between the two second sliding guide blocks 48; the body of the second telescopic cylinder 45 is installed on the second cylinder fixing plate 49; and the piston rod of the second telescopic cylinder 45 passes through the second cylinder fixing plate 49 and is connected to the second slide seat 46.

[0075] The driving assembly further includes a third driving assembly 402, which is arranged transversely and perpendicularly to the first driving assembly 4, and is arranged opposite to the second driving assembly 401. The third driving assembly 402 has a similar structure to the second driving assembly 401. Driven by the second driving assembly 401, the third side mold core 34 can slide along the third transverse groove, move closer to or away from the bottom mold core 31, and realize mold closing and mold opening.

[0076] In one of the embodiments: under the mutual cooperation of the first drive component 4, the second drive component 401 and the third drive component 402, when closing the mold, the first side mold core 32, the second side mold core 33 and the third side mold core 34 are continuously close to the bottom mold core 31 and then enclosed to form a mold cavity of a product; when opening the mold, the first side mold core 32 is first moved away from the bottom mold core 31 under the drive of the first drive component 4, and then the second drive component 401 and the third drive component 402 are moved away from the bottom mold core 31 in turn under the mutual cooperation, and the cast product is displayed on the bottom mold core 31, thereby realizing mold separation.

[0077] A mold opening mechanism 100 is arranged beside the lower mold module 2, and the mold opening mechanism 100 includes a mold opening bracket 101 arranged longitudinally, and the mold opening bracket 101 is equipped with a lifting motion seat 102 that can longitudinally move away from or approach the upper mold module 1, and the lifting motion seat 102 is equipped with a transverse bracket 106 arranged transversely, and the transverse bracket 106 is equipped with a longitudinally arranged mold opening seat 107, and the mold opening seat 107 is equipped with a connecting frame 110 connected to the movable mold assembly plate 21; the mold opening seat 107 is equipped with a demoulding column 128 that can longitudinally move away from or approach the upper mold module 1, and the demoulding column 128 can pass through the movable mold assembly plate 21 Enter into the dynamic model core and eject the product of the dynamic model core 3; one of the mold opening methods, the connecting frame 110 installed on the mold opening seat 107 is connected to the dynamic mold assembly plate 21, and the lifting and lowering motion seat 102 moves longitudinally, so that the dynamic mold assembly plate 21 can be away from the upper mold assembly 1, so as to achieve the mold opening effect, and then the fixed model core 14 and the dynamic model core 3 are separated, and the product will stick to the dynamic model core 3, and then the demolding column 128 of the mold opening seat 107 can pass through the dynamic mold assembly plate 21 to enter the dynamic model core 3 and eject the product of the dynamic model core 3, so as to achieve demolding and prevent the product from sticking to the dynamic model core 3, and the mold opening effect is better.

[0078] Furthermore, the mold opening bracket 101 is equipped with a first linear module 103 and a second linear module 104 arranged longitudinally, the first linear module 103 and the second linear module 104 have the same model specifications, and the driving ends of the first linear module 103 and the second linear module 104 are equipped with a demolding sliding seat 108, and the two demolding sliding seats 108 are connected to the lifting motion seat 102; the mold opening bracket 101 is also provided with a longitudinal guide rail 105 for the longitudinal movement of the lifting motion seat 102, and the lifting motion seat 102 moves longitudinally under the drive of the first linear module 103 and the second linear module 104, and adopts a dual linear module driving mode to increase the torque force of the lifting motion seat 102, increase the bearing capacity, and increase the mold opening speed. Due to the use of the longitudinal guide rail 105, the lifting motion seat 102 can move accurately in the vertical direction, thereby improving the stability of the movement.

[0079] Furthermore, the connecting frame 110 includes a transverse opening template 111, the transverse opening template 111 is installed with a longitudinally arranged connecting seat 112, the left and right sides of the connecting seat 112 are respectively installed with longitudinally arranged clamping blocks 113, the top of the clamping block 113 is installed with a transversely arranged barb plate 114, and the connecting seat 112 is provided with a transverse telescopic cylinder 115 for driving the clamping block 113 to move laterally away from or close to the connecting seat 112; the bottom of the movable mold assembly plate 21 is formed with a clamping groove 25 for inserting the clamping block 113, and the clamping groove 25 is formed with a barb groove 26 for inserting the barb plate 114 laterally; when the mold opening mechanism 100 needs to be connected to the movable mold assembly plate 21, the clamping block 113 is in the transverse telescopic cylinder 115 15 is driven to extend outward, and the lifting and moving seat 102 moves longitudinally so that the clamping block 113 beside the connecting seat 112 is vertically aligned with the clamping groove 25 at the bottom of the movable mold assembly plate 21, and then the lifting and moving seat 102 moves longitudinally so that the clamping block 113 is inserted into the clamping groove 25, and then the transverse telescopic cylinder 115 retracts, and the hook plate 114 is laterally inserted into the hook groove 26, so that the clamping block 113 of the connecting frame 110 is clamped with the movable mold assembly plate 21, and then the lifting and moving seat 102 moves longitudinally in the direction away from the fixed mold assembly plate 10, so that the fixed mold assembly plate 10 is separated from the movable mold assembly plate 21, and then the fixed model core 14 and the movable model core 3 are separated, and the product will adhere to the movable model core 3 to achieve the mold opening effect.

[0080] Further, after the mold is opened, the connecting frame 110 is located above the mold opening base 107, a connecting column 109 is installed between the mold opening base 107 and the horizontal opening plate 111, a longitudinally arranged mold opening lifting cylinder 116 is installed at the bottom of the mold opening base 107, the bottom of the demoulding column 128 is installed at the driving end of the mold opening lifting cylinder 116, a bottom movable sleeve 117 for the demoulding column 128 to move through is installed between the mold opening base 107 and the horizontal opening plate 111, and the horizontal opening plate 111 is formed with a top hole 118 for the demoulding column 128 to pass through, and the top of the top hole 118 A top movable sleeve 119 is installed for a demoulding column 128 to move through, and a demoulding hole 28 for the demoulding column 128 to pass through is formed between the movable mold assembly plate and the movable mold core, and the demoulding hole 28 is coaxially aligned with the top movable sleeve 119; after the mold is opened, the mold opening lifting cylinder 116 moves to drive the demoulding column 128 to lift up, and the demoulding column 128 can be accurately inserted into the demoulding hole 27 after passing through the bottom movable sleeve 117, the top hole 118 and the top movable sleeve 119, and enter the movable mold core along the demoulding hole 27, so that the product adhered to the movable mold core can be ejected to achieve demoulding.

[0081] In one embodiment, the lifting and lowering seat 102 is equipped with a rotating mechanism 120, which includes a first mounting plate 121 and a second mounting plate 122 located below the first mounting plate 121, a rotating shaft 123 is arranged between the first mounting plate 121 and the second mounting plate 122, the inner end of the transverse bracket 106 is connected to the rotating shaft 123 and the second mounting plate 122, the top of the first mounting plate 121 is connected to the lifting and lowering seat 102, and the second mounting plate 122 is connected to the rotating shaft 123. When the rotating shaft 123 rotates, the second mounting plate 122 can rotatably drive the transverse bracket 106 to swing laterally around the rotating shaft 123; an annular groove 124 is formed on the bottom surface of the first mounting plate 121, and a limiting sliding block 125 that slidably cooperates with the annular groove 124 is installed on the top of the transverse bracket 106; when one of the molds is filled with metal liquid for casting, the mold opening mechanism 100 can be applied to other molds, and multiple molds are arranged, the molds are located on the periphery of the first mounting plate 121, and two adjacent molds are arranged at equal angles. When the mold opening mechanism 100 needs to be applied to other molds, the rotating mechanism 120 works, and the rotating shaft 123 rotates on the first mounting plate 121, driving the second mounting plate 122 to rotate and the transverse bracket 106 connected to the mounting plate and the rotating shaft 123 to swing to the bottom of the adjacent mold, and then through the control of the lifting motion seat 102, it is connected to the movable mold plate of the mold to achieve mold opening and demolding.

[0082] Preferably, the first mounting disk 121 is installed with a servo motor 126 and a reducer 127 connected to the servo motor 126. The first mounting disk 121 is fixedly connected to the lifting drive seat. The servo motor 126 can drive the intermittent rotation of the rotating shaft 123 at equal angles to prevent the rotating shaft 123 from rotating beyond the stroke and affecting the connection with the mold.

[0083] A heat dissipation structure is arranged between the upper mold module 1 and the lower mold module 2 , and the heat dissipation structure includes an upper mold heat dissipation structure 9 arranged on the upper mold module 1 and a lower mold heat dissipation structure 5 arranged on the lower mold module 2 .

[0084] The lower mold heat dissipation structure 5 includes a lower mold heat dissipation cavity 51 opened in the movable mold plate 24. The lower mold heat dissipation cavity 51 is formed with a cooling cavity 52 for water cooling liquid to pass through. The lower mold heat dissipation cavity 51 is also formed with a water cooling inlet 53 for water cooling liquid to enter the cooling cavity 52 and a water cooling outlet 54 for water cooling liquid to be discharged. One guide hole 28 is connected to the water cooling inlet 53, and the other guide hole 28 is connected to the water cooling outlet 54.

[0085] The movable template 24 is provided with a connecting cavity 55, and the connecting cavity 55 is equipped with a swingable sealing plate 56, and the sealing plate 56 is equipped with a sealing block 57 that cooperates with the water-cooling inlet 53; the guide rod 94 is formed with a water-cooling cavity 58 with a hollow structure, and the cross-section of the water-cooling cavity 58 is cylindrical, and a rotatable arc block 98 is installed in the water-cooling cavity 58, one guide rod 94 is formed with a water-cooling input port 88 that coaxially cooperates with the water-cooling inlet 53, and the other guide rod 94 is formed with a water-cooling output port 89 that coaxially cooperates with the water-cooling outlet 54.

[0086] In this embodiment, water-cooling liquid is introduced into the water-cooling input port 88 of one of the guide rods 94, so that the water-cooling liquid can flow through the water-cooling cavity 58. The water-cooling liquid passes through the water-cooling input port 88 and cooperates with the water-cooling inlet port 53 of the lower mold heat dissipation cavity 51. The water-cooling liquid can enter the cooling cavity 52 of the lower mold heat dissipation cavity 51. Since the movable mold plate 24 is directly in contact with the movable model core 3, the heat of the movable model core 3 will be transmitted to the movable mold plate 24. The cooling cavity 52 can continuously transmit the heat of the movable mold plate 24 to the outside through the coolant to achieve heat exchange, thereby reducing the temperature of the movable mold plate 24 and reducing the temperature inside the mold.

[0087] Furthermore, the sealing plate 56 can isolate the water-cooling chamber 58 of the guide rod 94 from the cooling chamber 52, acting as a valve. After the mold is opened, the guide rod 94 will slide with the movable template 24, and the water-cooling liquid will not enter the movable template 24 at this time; the arc plate can also rotate accordingly to prevent the coolant in the water-cooling chamber 58 from flowing out from the water-cooling input port 88 and the water-cooling output port 89, thereby achieving the effect of preserving the water-cooling liquid and reducing the occurrence of leakage.

[0088] This solution integrates the heat dissipation structure between the guide rod 94 and the movable template 24, which greatly reduces the space occupied and does not require large mechanical structures such as brackets to be arranged outside the mold. The overall structure is simple, and it is only necessary to open the mold on the corresponding guide rod 94 and the movable template 24 to form a cavity for the flow of coolant, which greatly reduces the cost. Compared with traditional air-cooled heat dissipation, water-cooled heat dissipation has a better heat dissipation effect, and can quickly discharge the internal heat to the outside to achieve a rapid cooling effect.

[0089] The upper mold heat dissipation structure 9 includes a fixed mold heat conduction cavity 91 opened in the fixed mold assembly plate 10, and an upper mold inlet 92 and an upper mold outlet 93 connected to the fixed mold heat conduction cavity 91; the upper mold inlet 92 is installed with a sealing guide sleeve 96, and the guide rod 94 is protrudingly formed with an insertion port 95 connected to the guide sleeve. In this embodiment, since the fixed mold assembly plate 10 is fixedly connected to the guide rod 94, the guide rod 94 and the fixed mold assembly plate 10 are inserted into the upper mold inlet 92 through the insertion port 95 and the sealing guide sleeve 96, and the water-cooling liquid can enter the fixed mold heat conduction cavity 91, flow along the cooling cavity 52 of the fixed mold heat conduction cavity 91, and then be discharged into the water cooling cavity 58 of the fixed mold assembly plate 10 of the guide rod 94 through the upper mold outlet 93, forming a flow. The cooperation of the sealing guide sleeve 96 and the insertion port 95 can improve the connection stability of the guide rod 94 and the fixed mold assembly plate 10, and maintain the sealing of the upper mold inlet 92 and the insertion port 95 of the guide rod 94.

[0090] Furthermore, a copper contact surface is formed in the area where the movable mold plate 24 contacts the bottom mold core 31, the first side mold core 32, the second side mold core 33 and the third side mold core 34. The copper contact surface is directly in contact with the metal liquid being cast and is the area with the highest temperature in the mold. The bottom mold core 31, the first side mold core 32, the second side mold core 33 and the third side mold core 34 can quickly transfer heat to the movable mold plate 24 through the copper contact surface.

[0091] Preferably, the top of the guide rod 94 passes through the upper mold module 1, and a water-cooling connecting valve port is installed on the top of the guide rod 94. One of the water-cooling connecting valve ports of the guide rod 94 is connected to the first pump body, so that the first pump body passes the water-cooling liquid into the guide rod 94; one of the water-cooling connecting valve ports of the guide rod 94 is connected to the second pump body to extract the water-cooling liquid from the guide rod 94; the water-cooling liquid can be passed into the radiator heat dissipation module, so that the water-cooling liquid can be cooled and the internal heat can be continuously circulated and discharged.

[0092] Specifically, the water-cooling chamber 58 is provided with an inner sleeve 97 coaxially aligned with the guide rod 94, and a gap is provided between the inner sleeve 97 and the annular wall of the water-cooling chamber 58, and the arc block 98 is located in the gap, and the gap is provided with a limit block 99 cooperating with the arc block 98; the arc block 98 moves along the gap, and can block the water-cooling input port 88 and the water-cooling output port 89 formed on the guide rod 94. At this time, the coolant will be blocked and brought into the inner sleeve 97, and will not pass through the water-cooling input port 88 and the water-cooling output port 89, thereby preventing the water-cooling liquid of the water-cooling chamber 58 from leaking out, and the limit block 99 can prevent the arc block 98 from exceeding the stroke when moving.

[0093] The fixed die plate 10 is provided with a closing mechanism 6 for driving the blocking plate 56 to swing. The closing mechanism 6 includes a sliding groove 61 arranged transversely along the connecting cavity 55. A sliding block 62 is slidably installed in the sliding groove 61. The blocking plate 56 is installed on the sliding block 62. A stop block 63 is installed at one end of the sliding groove 61. An internal compression spring 64 is installed between the stop block 63 and the sliding block 62. After the mold is closed, after the product is formed in the cavity, the heat dissipation structure works. After the temperature is dissipated to a specified value, demoulding begins. During demoulding, the closing mechanism 6 works, and the blocking plate 56 moves along the sliding groove 61 through the sliding block 62. The blocking plate 56 approaches the water-cooling inlet 53. After the blocking plate 56 abuts against the stop block 63, the sealing block 57 cooperates with the water-cooling inlet 53 to block the water-cooling inlet 53. At this time, the water-cooling liquid cannot enter the cooling cavity 52, and the water-cooling liquid in the cooling cavity 52 can also be prevented from leaking out. After the mold is closed, the elastic force of the internal compression spring 64 moves the sliding block 62 to the other side, and the blocking plate 56 is away from the water cooling inlet 53 , so that the liquid in the water cooling chamber 58 can enter the cooling chamber 52 .

[0094] In one of the embodiments, the movable template 24 is longitudinally formed with a movable hole 65, the top of the movable hole 65 is a through structure, a movable column 66 is installed in the movable hole 65, an external compression spring 67 is installed between the bottom of the movable column 66 and the bottom of the movable hole 65, the elastic force of the external compression spring 67 is greater than the elastic force of the internal compression spring 64, when the movable mold plate 21 is demolded, the movable column 66 will pop outward under the elastic drive of the external compression spring 67, a connecting piece is provided between the movable column 66 and the sealing plate 56, when the movable column 66 pops outward, it will drive the sealing plate 56 to approach the water cooling inlet 53 to continuously seal and block the water cooling inlet 53.

[0095] In this embodiment, when the movable die plate 21 is demolded, the movable die plate 24 will be away from the fixed die plate 10, and the movable column 66 will pop outward under the elastic drive of the external compression spring 67, and the sealing plate 56 is driven by the connecting piece to approach the water cooling inlet 53 to continuously seal and block the water cooling inlet 53. The sealing block 57 cooperates with the water cooling inlet 53 to block the water cooling inlet 53. At this time, the water cooling liquid cannot enter the cooling chamber 52, and the water cooling liquid in the cooling chamber 52 can also be prevented from leaking out. The cooling chamber 52 is automatically sealed and blocked during demolding without the help of external mechanical structures, and the degree of automation is high.

[0096] In one embodiment, the connecting member includes an inner connecting block 68 installed on the sealing plate 56, the movable column 66 is installed with an outer connecting block 69, a metal connecting wire 71 is connected between the outer connecting block 69 and the inner connecting block 68, and a connecting channel 7 is provided between the movable hole 65 and the connecting cavity 55, the connecting channel 7 is a gap, and the connecting channel 7 is installed with an upper guide roller 72 and a lower guide roller 73 for guiding the movement of the metal connecting wire 71. When the movable mold assembly plate 21 is demoulded, the movable column 66 will pop outward under the elastic drive of the external compression spring 67, and the metal connecting wire 71 installed between the external connecting block 69 and the internal connecting block 68 will roll with the upper guide roller 72 and the lower guide roller 73 of the connecting channel 7, driving the blocking plate 56 to approach the water cooling inlet 53 to continuously seal and block the water cooling inlet 53, and the sealing block 57 cooperates with the water cooling inlet 53 to block the water cooling inlet 53. At this time, the water cooling liquid cannot enter the cooling chamber 52, and the water cooling liquid in the cooling chamber 52 can also be prevented from leaking. The cooperation of the upper guide roller 72 and the lower guide roller 73 with the metal connecting wire 71 can improve the movement stability and smoothness of the closing block.

[0097] In one embodiment, the movable column 66 is formed with a hollow movable cavity 75, the external connection block 69 is installed in the movable cavity 75, and the movable column 66 is also formed with a transverse hole 76 connected to the movable cavity 75. The hole wall of the transverse hole 76 is installed with an external guide roller in contact with the metal connecting wire 71; the movable column 66 is also provided with a height adjustment mechanism 74 for adjusting the height of the external connection block 69. The height of the external connection block 69 can be adjusted by the height adjustment mechanism 74, so that the moving stroke of the blocking plate 56 of the movable mold plate 24 can be changed when demolding. When the external connection block 69 is away from the transverse hole 76, in the mold closing state, the distance between the blocking plate 56 and the water cooling inlet 53 is shortened, and the distance between the blocking plate 56 and the water cooling inlet 53 is shortened when the mold is opened. When the speed is the same, the time is reduced. On the contrary, when the external connection block 69 is close to the transverse hole 76, in the mold closing state, the distance between the sealing plate 56 and the water cooling inlet 53 increases, and when the mold is opened, the distance the sealing plate 56 moves to the water cooling inlet 53 increases. When the speed is the same, the time increases.

[0098] Specifically, the height adjustment mechanism 74 includes an adjusting rod 8 installed on the movable column 66, the movable column 66 is provided with an adjusting hole 77 connected to the movable cavity 75, the adjusting hole 77 is installed with a threaded sleeve 78 threadedly matched with the adjusting rod 8, a bearing seat is installed at the bottom of the adjusting rod 8, and the bearing seat is also installed on the top of the external connecting block 69. In this embodiment, by rotating the adjusting rod 8, the adjusting rod 8 is threadedly matched with the threaded sleeve 78 of the adjusting hole 77, and the adjusting rod 8 can move axially on the movable column 66. The bearing seat is connected to the external connecting block 69 to prevent the external connecting block 69 from rotating, thereby ensuring that the adjusting rod 8 can drive the external connecting block 69 to move accordingly when the movable column 66 moves axially, thereby realizing height adjustment.

[0099] Furthermore, since the top of the movable mold plate 24 will fit with the fixed mold assembly plate 10 when the mold is closed, a rotating handle 87 is installed on the top of the adjusting rod 8, and an inner groove 79 is opened on the top of the movable column 66 for the rotating handle 87 to move; the inner groove 79 can accommodate the rotating handle 87 to prevent the rotating handle 87 from protruding and affecting the mold closing.

[0100] In one of the embodiments, when the height of the external connection block 69 is adjusted to the upper part of the movable cavity 75, the top of the adjusting rod 8 will bulge and affect the mold closing. For this, the adjusting rod 8 includes a bottom rod 81 and a top rod 82, wherein the bottom rod 81 is threadedly matched with the threaded sleeve 78, and the upper part of the bottom rod 81 is formed with a telescopic hole 83 for the top rod 82 to be movably inserted; the hole wall of the telescopic hole 83 is formed with a first stopper along the way, and the top rod 82 is formed with a second stopper matched with the first stopper; the bottom rod 81 and the top rod 82 are matched through the telescopic hole 83, so that the length of the adjusting rod 8 can be shortened, and the top of the adjusting rod 8 can be prevented from bulging and affecting the mold closing. When adjusting the height of the external connecting block 69, the height of the top rod 82 can be moved so that the second stopper of the top rod 82 is engaged with the first stopper of the telescopic hole 83 of the bottom rod 81, that is, the first stopper and the second stopper are horizontally aligned; when the top rod 82 is rotated, the bottom rod 81 is rotated accordingly, and the bottom rod 81 is threadedly engaged with the threaded sleeve 78 to achieve the height adjustment of the external connecting block 69; after the adjustment is completed, the height of the top rod 82 can continue to be moved, and the length of the adjusting rod 8 can be shortened to prevent the protrusion of the rotating handle 87 from affecting the mold closing.

[0101] In one embodiment, the first stopper includes a pair of stopper bars 85, and the second stopper includes an engaging block 84 protruding from the outer wall of the top rod 82. The engaging block 84 can be slidably embedded in the first stopper, and the two ends of the stopper bar 85 are respectively formed with flaring structures 86 for guiding the engaging block 84 to enter. When the length of the adjustment rod 8 is shortened and the height of the external connection block 69 needs to be adjusted, the top rod 82 can be rotated so that the engaging block 84 of the top rod 82 is located between the two stopper bars 85, and then the top rod 82 is pulled, that is, the stopper bar 85 and the engaging block 84 are aligned horizontally, resulting in a stop fit, and then the top rod 82 is continued to be rotated, which can drive the bottom rod 81 to rotate accordingly, and the bottom rod 81 is threadedly engaged with the threaded sleeve 78 to achieve the height adjustment of the external connection block 69.

[0102] In summary, it can be seen that the present invention has the above-mentioned excellent characteristics, which can enhance the performance unprecedented in the prior art and become a product with great practical value. The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A mold for casting an aluminum alloy motor housing for a new energy vehicle, comprising an upper mold module and a lower mold module, wherein a guide structure is arranged between the upper mold module and the lower mold module, and characterized in that: The guide structure comprises a guide rod installed on the upper die set, and the upper die set and the lower die set are respectively formed with guide holes that are slidably matched with the guide rod; The upper mold assembly includes a fixed mold assembly plate and a fixed mold core; The lower mold module includes a movable mold plate, a movable mold core and a driving module; The dynamic mold core comprises a bottom mold core, a first side mold core, a second side mold core and a third side mold core, wherein the bottom mold core is installed on the dynamic mold plate; the first side mold core, the second side mold core and the third side mold core are continuously close to the bottom mold core and then enclosed to form a mold cavity of a product; The driving module comprises a first driving assembly for driving the first side mold core to reciprocate, a second driving assembly for driving the second side mold core to reciprocate, and a third driving assembly for driving the third side mold core to reciprocate; A mold opening mechanism is arranged beside the lower mold module, and the mold opening mechanism includes a mold opening bracket arranged longitudinally, the mold opening bracket is equipped with a lifting seat that can longitudinally move away from or approach the upper mold module, the lifting seat is equipped with a transverse bracket arranged transversely, the transverse bracket is equipped with a longitudinally arranged mold opening seat, and the mold opening seat is equipped with a connecting frame connected to the movable mold assembly plate; the mold opening seat is equipped with a demoulding column that can longitudinally move away from or approach the upper mold module, and the demoulding column can pass through the movable mold assembly plate into the movable mold core and eject the product of the movable mold core; A heat dissipation structure is provided between the upper die module and the lower die module, the heat dissipation structure comprises a lower die heat dissipation cavity provided in the movable die plate, the lower die heat dissipation cavity is formed with a cooling cavity for water cooling liquid to pass through, the lower die heat dissipation cavity is also formed with a water cooling inlet for water cooling liquid to enter the cooling cavity and a water cooling outlet for water cooling liquid to be discharged, one guide hole is connected with the water cooling inlet, and the other guide hole is connected with the water cooling outlet; The movable template is also provided with a connecting cavity, the connecting cavity is provided with a swingable blocking plate, and the blocking plate is provided with a sealing block matched with the water cooling inlet; The guide rod is formed with a water-cooling cavity with a hollow structure. The cross-section of the water-cooling cavity is annular. A rotatable arc block is installed in the water-cooling cavity. One guide rod is formed with a water-cooling input port coaxially matched with the water-cooling inlet port, and the other guide rod is formed with a water-cooling output port coaxially matched with the water-cooling outlet port.

2. A mold for casting an aluminum alloy motor housing for new energy vehicles according to claim 1, characterized in that: The mold opening bracket is installed with a first linear module and a second linear module arranged longitudinally, the first linear module and the second linear module have the same model and specifications, and the driving ends of the first linear module and the second linear module are connected to the lifting and lowering seat; the mold opening bracket is also provided with a longitudinal guide rail for the longitudinal movement of the lifting and lowering seat, and the lifting and lowering seat moves longitudinally under the drive of the first linear module and the second linear module; the lifting and lowering seat is installed with a rotating mechanism, the rotating mechanism includes a first mounting plate and a second mounting plate located below the first mounting plate, a rotating shaft is arranged between the first mounting plate and the second mounting plate, the inner end of the transverse bracket is connected to the rotating shaft, the top of the first mounting plate is connected to the lifting and lowering seat, and the second mounting plate is connected to the rotating shaft. When the rotating shaft rotates, the second mounting plate can rotatably drive the transverse bracket to swing laterally around the rotating shaft; an annular groove is formed on the bottom surface of the first mounting plate, and a limiting sliding block that slides with the annular groove is installed on the top of the transverse bracket.

3. A mold for casting an aluminum alloy motor housing for new energy vehicles according to claim 2, characterized in that: The connecting frame includes a transverse open template, which is equipped with a longitudinally arranged connecting seat, longitudinally arranged clamping blocks are respectively installed on the left and right sides of the connecting seat, a transversely arranged barb plate is installed on the top of the clamping block, and the connecting seat is provided with a transverse telescopic cylinder for driving the clamping block to move laterally away from or close to the connecting seat; a clamping groove for inserting the clamping block is formed at the bottom of the movable mold plate, and a barb groove for inserting the barb plate laterally is formed along the clamping groove.

4. A mold for casting an aluminum alloy motor housing for new energy vehicles according to claim 3, characterized in that: The connecting frame is located above the mold opening base, a connecting column is installed between the mold opening base and the horizontal opening template, a longitudinally arranged mold opening lifting cylinder is installed at the bottom of the mold opening base, the bottom of the demoulding column is installed at the driving end of the mold opening lifting cylinder, a bottom movable sleeve for the demoulding column to move through is installed between the mold opening base and the horizontal opening template, a top hole for the demoulding column to pass through is formed on the horizontal opening template, a top movable sleeve for the demoulding column to move through is installed on the top of the top hole, a demoulding hole for the demoulding column to pass through is formed between the movable mold assembly plate and the movable mold core, and the demoulding hole is coaxially aligned with the top movable sleeve.

5. The mold for casting an aluminum alloy motor housing for a new energy vehicle according to claim 1, characterized in that: The first driving assembly includes a first telescopic cylinder obliquely installed on the movable template, the movable template is provided with an obliquely arranged bevel groove, the bevel groove is slidably installed with a first slide seat, the first slide seat and the first side mold core can slide along the bevel groove, first sliding guide blocks are installed on both sides of the bevel groove, and the first sliding guide blocks are arranged along the sliding direction of the first slide seat; the number of the first sliding guide blocks is two, which are respectively arranged on both sides of the sliding direction of the first slide seat, a first cylinder fixing plate is installed between the two first sliding guide blocks, the body of the first telescopic cylinder is installed on the first cylinder fixing plate, and the piston rod of the first telescopic cylinder passes through the first cylinder fixing plate and is connected to the first slide seat.

6. The mold for casting an aluminum alloy motor housing for a new energy vehicle according to claim 1, characterized in that: The heat dissipation structure also includes a fixed mold heat conduction cavity opened on the fixed mold assembly plate and an upper mold inlet and an upper mold outlet connected to the fixed mold heat conduction cavity; the upper mold inlet is equipped with a sealing guide sleeve, and the guide rod protrusion is formed with an insertion port connected to the sealing guide sleeve; the top of the guide rod passes through the upper mold assembly, and the top of the guide rod is equipped with a water-cooling connection valve port, and the water-cooling cavity is equipped with an internal sleeve coaxially aligned with the guide rod, and the internal sleeve and the annular wall of the water-cooling cavity have a gap, and the arc block is located in the gap, and the gap is provided with a sliding block that cooperates with the arc block.

7. The mold for casting an aluminum alloy motor housing for a new energy vehicle according to claim 1, characterized in that: The fixed mold assembly plate is provided with a closing mechanism that drives the sealing plate to swing, and the closing mechanism includes a sliding groove arranged horizontally along the connecting cavity, a sliding block is slidably installed in the sliding groove, the sealing plate is installed on the sliding block, a stop block is installed at one end of the sliding groove, and an internal compression spring is installed between the stop block and the sliding block; a movable hole is longitudinally formed with a movable template, the top of the movable hole is a through structure, a movable column is installed in the movable hole, an external compression spring is installed between the bottom of the movable column and the bottom of the movable hole, the elastic force of the external compression spring is greater than the elastic force of the internal compression spring, when the movable mold assembly plate is demoulded, the movable column will pop outward under the elastic drive of the external compression spring, a connecting piece is provided between the movable column and the sealing plate, and when the movable column pops out, it will drive the sealing plate to approach the water cooling inlet to continuously seal and block the water cooling inlet.

8. The mold for casting an aluminum alloy motor housing for a new energy vehicle according to claim 7, characterized in that: The connecting piece includes an inner connecting block installed on the sealing plate, an outer connecting block is installed on the movable column, a metal connecting wire is connected between the outer connecting block and the inner connecting block, a connecting channel is provided between the movable hole and the connecting cavity, and the connecting channel is installed with an upper guide roller and a lower guide roller for guiding the movement of the metal connecting wire.

9. The mold for casting an aluminum alloy motor housing for new energy vehicles according to claim 8, characterized in that: The movable column is formed with a movable cavity with a hollow structure, and the external connecting block is installed in the movable cavity. The movable column is also formed with a transverse hole connected with the movable cavity, and the hole wall of the transverse hole is installed with an external guide roller in contact with the metal connecting line; the movable column is also provided with a height adjustment mechanism for adjusting the height of the external connecting block; the height adjustment mechanism includes an adjusting rod installed on the movable column, the movable column is provided with an adjusting hole connected with the movable cavity, the adjusting hole is provided with a threaded sleeve matched with the adjusting rod thread, a bearing seat is installed at the bottom of the adjusting rod, the bearing seat is also installed on the top of the external connecting block, a rotating handle is installed on the top of the adjusting rod, and an inner groove for the rotating handle to move is provided at the top of the movable column.

10. The mold for casting an aluminum alloy motor housing for new energy vehicles according to claim 9, characterized in that: The adjusting rod comprises a bottom rod and a top rod, wherein the bottom rod is threadedly matched with the threaded sleeve, and a telescopic hole is formed on the upper part of the bottom rod for the top rod to be movably inserted; a first stopper is formed along the hole wall of the telescopic hole, and a second stopper matched with the first stopper is formed on the top rod; the first stopper comprises a pair of stop strips, and the second stopper comprises an engaging block protrudingly formed on the outer wall of the top rod, the engaging block can be slidably embedded in the first stopper, and flaring structures are respectively formed at both ends of the stop strip for guiding the engaging block to enter.

Images