Blow needle mechanism for blow molding machine

Abstract

The present invention discloses a blow needle mechanism for a blow molding machine, comprising a base, a first fixed block and a second fixed block are sequentially arranged upward on the upper part of the base, a blow rod is connected in the middle of the base, a transmission rod is sleeved on the outer side of the blow rod, a lever is connected to the bottom end of the transmission rod, a rodless cylinder is connected to the lever, a piston rod is sleeved on the outer side of the transmission rod, a cylinder barrel is sleeved on the outer side of the piston rod, a piston is arranged in the middle of the piston rod, a front cylinder cover and a cutout ring sleeved on the piston rod are sequentially connected upward on the upper part of the cylinder barrel, a guide sleeve is connected to the upper end of the piston rod, a pin fixing ring is connected to the upper end of the transmission rod, a plurality of clamping blocks are movably connected above the pin fixing ring, and a threaded insert is clamped on the guide sleeve through a plurality of clamping blocks. The beneficial effects of the present invention are: rapid assembly of threaded inserts is realized, replacement and maintenance of threaded inserts are convenient, the applicability is wide, the locking force formed by the clamping blocks is large and balanced, and the thread processing is ensured to be stable; the heat dissipation and blow molding effects are good.

Description

Technical Field

[0001] The invention relates to the technical field of blow molding machines, in particular to a blow needle mechanism for a blow molding machine. Background Art

[0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic preform obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the preform to inflate the plastic preform and make it close to the inner wall of the mold. After cooling and demolding, various hollow products are obtained. In the hollow bottle blowing machine, the blow needle is used to inflate the blank inserted into the mold. The blank expands as the air pressure increases, forcing it to close to the mold, thereby achieving the molding of the plastic product and playing a certain cooling role. It is an indispensable component in the blow molding process of the hollow blow molding machine. Since most hollow products have relatively high requirements for the inner diameter of the mouth, especially bottle products, this requires that the cooling effect of the blow needle in the blow needle structure should be good. In addition, the mouth of some bottle products needs to be processed with internal threads, but the internal threads cannot be directly formed by the mold, so it is necessary to make a thread structure on the blow needle. The thread structure is made directly on the blow needle. Generally, the thread structure is made directly on the end of the blow needle. This thread structure is difficult to maintain and is only applicable to a specific size of bottle mouth, making the thread structure too simple. At the same time, the traditional blow needle structure has simple functions, and most of them only have cooling functions. Other functions, such as the positioning of the product bottle mouth, require the addition of special positioning fixtures or mechanisms, which increases the complexity and difficulty of the blow molding machine operation. Summary of the invention

[0003] The object of the present invention is to provide a blow needle mechanism for a blow molding machine to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a blowing needle mechanism for a blow molding machine, comprising a base, a first fixed block and a second fixed block are sequentially arranged upwardly on the upper side of the base, a blowing rod is connected in the middle of the base and passes through the first fixed block and the second fixed block upwardly, a transmission rod is sleeved on the outer side of the blowing rod, the transmission rod is arranged on the first fixed block and passes through the second fixed block upwardly, a shift rod is connected to the bottom end of the transmission rod, the shift rod passes through the first fixed block and is connected to a rodless cylinder, a piston rod is sleeved on the outer side of the transmission rod, the piston rod is arranged on the second fixed block, and the outer side of the piston rod is sleeved The side sleeve is provided with a cylinder, and a piston arranged in the cylinder is provided in the middle of the piston rod. The cylinder is arranged above the second fixed block, and the upper part of the cylinder is sequentially connected with a front cylinder cover and a cutout ring arranged on the piston rod. The upper end of the piston rod is connected with a guide sleeve arranged on the transmission rod, and the upper end of the transmission rod is connected with a pin fixing ring, and the pin fixing ring is arranged in the guide sleeve. A plurality of clamping blocks are movably connected above the pin fixing ring, and the plurality of clamping blocks are slidably arranged along the circumferential direction of the guide sleeve. A threaded insert is clamped on the guide sleeve through a plurality of clamping blocks, and the blowing rod passes through the guide sleeve upward.

[0005] Further preferably, the inner cavity of the cylinder is divided into a first oil chamber and a second oil chamber by a piston, and a first oil channel and a second oil channel are provided inside the side wall of the piston rod along its length direction. The first oil channel is connected to the first oil chamber, and the second oil channel is connected to the second oil chamber, which facilitates the input and output of the hydraulic oil in the first oil chamber and the second oil chamber, thereby realizing the up and down movement function of the cylinder.

[0006] Further preferably, a first oil hole and a second oil hole are provided on the second fixing block, the first oil hole is connected to the first oil channel, and the second oil hole is connected to the second oil channel, so as to facilitate the input and output of the hydraulic oil.

[0007] Further preferably, the guide sleeve is provided with a plurality of sliding grooves that cooperate with the card block, ensuring that the card block can extend out of or into the guide sleeve, so as to facilitate the sleeve and locking of the threaded insert; each of the card blocks is provided with an arc-shaped waist hole near the end of the pin fixing ring, and the pin on the pin fixing ring is movably inserted into the arc-shaped waist hole on the card block, and the card block is driven to slide along the sliding groove through the cooperation of the pin on the pin fixing ring and the arc-shaped waist hole on the card block.

[0008] Further preferably, the shifting rod is fixedly connected to the transmission rod, and the shifting rod is movably connected to the rodless cylinder, so that the rodless cylinder can drive the shifting rod to rotate, thereby driving the transmission rod to rotate.

[0009] Further preferably, the blowing rod and the transmission rod are clearance matched, the gap between the blowing rod and the transmission rod forms a first water chamber, the transmission rod and the piston rod and the guide sleeve are all clearance matched, the gap between the transmission rod and the piston rod and the guide sleeve forms a second water chamber, the upper end of the first water chamber is connected with the upper end of the second water chamber, the connection between the first water chamber and the second water chamber is realized, the double-layer cooling water is realized for cooling and heat insulation, the cooling effect is good, and the blow molding effect and safety of the blowing needle mechanism are improved.

[0010] Further preferably, the first fixed block is provided with a water inlet hole, which is connected to the first water cavity, and the second fixed block is provided with a water outlet hole, which is connected to the second water cavity, so as to realize the inflow and outflow of cooling water in the first water cavity and the second water cavity and ensure the circulation of cooling water.

[0011] Further preferably, the base is provided with an air inlet hole connected to the blow rod, the upper end of the blow rod is connected with a pressure cover, the pressure cover is arranged on the guide sleeve, and the pressure cover is provided with a plurality of air outlet holes connected to the blow rod, so as to realize the blow molding function of the blow needle mechanism.

[0012] Beneficial effects: The blow needle mechanism for a blow molding machine of the present invention realizes the rapid assembly of the threaded insert through the locking structure composed of the rodless cylinder, the lever, the transmission rod, the pin fixing ring, the clamping block and the guide sleeve, which is convenient for the replacement and maintenance of the threaded insert, and can process the bottle mouths of different inner diameters, and has a wide range of applicability; at the same time, the locking force formed by the clamping block is large and balanced, which ensures the stability of the threaded insert when the product is threaded; through the structural setting of the piston rod and the cylinder barrel, the cylinder barrel can move up and down along the piston rod, and realize the synchronous up and down movement of the front cylinder cover and the cutout ring, and then can drive the cutout ring to slide along the outer wall of the piston rod and the guide sleeve, and move upward through the cutout ring to resist the bottle mouth of the product, which is used for the downward limit in the process of product blow molding, and is convenient for the molding of the inner thread of the bottle mouth of the product; through the first water chamber and the second water chamber that are interconnected, a double-layer cooling water is formed to absorb heat and cool down, with good cooling effect and high heat exchange rate, so that the product can be cooled while blow molding, the production efficiency of the product is improved, and the safety of the blow needle mechanism is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the axonometric structure of a blow needle mechanism for a blow molding machine disclosed in an embodiment of the present invention;

[0014] Figure 2 It is a schematic cross-sectional view of the structure of a blow needle mechanism for a blow molding machine disclosed in an embodiment of the present invention from an angle;

[0015] Figure 3 The embodiment disclosed in the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0016] Figure 4 The embodiment disclosed in the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0017] Figure 5 It is a schematic cross-sectional structure diagram of another angle of the blow needle mechanism for the blow molding machine disclosed in the embodiment of the present invention;

[0018] Figure 6 The embodiment disclosed in the present invention Figure 5 The enlarged structural diagram at C in the middle;

[0019] Figure 7 A schematic diagram of a locking structure formed by a rodless cylinder, a shifting rod, a transmission rod, a pin fixing ring, a clamping block and a guide sleeve disclosed in an embodiment of the present invention;

[0020] Figure 8 It is a schematic rear structural view of a blow needle mechanism for a blow molding machine disclosed in an embodiment of the present invention.

[0021] Figure markings: 1-base, 2-first fixed block, 3-second fixed block, 4-air inlet, 5-blowing rod, 6-transmission rod, 7-piston rod, 8-cylinder, 9-guide sleeve, 10-front cylinder head, 11-cut ring, 12-threaded insert, 13-pin fixing ring, 14-block, 15-pressure cover, 16-shift rod, 17-rodless cylinder, 18-piston, 19-first oil chamber, 20-second oil chamber, 21-first oil channel, 22-second oil channel, 23-first oil hole, 24-second oil hole, 25-first water chamber, 26-second water chamber, 27-water inlet, 28-water outlet, 29-air outlet. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example

[0023] like Figure 1-8As shown, a blow needle mechanism for a blow molding machine is used for blow molding of bottle products. The blow needle mechanism includes a base 1. A first fixing block 2 and a second fixing block 3 are sequentially arranged upwardly on the base 1. A blow rod 5 is connected in the middle of the base 1 and penetrates the first fixing block 2 and the second fixing block 3 upwardly. The base 1 is used to fix the blow rod 5. A blow hole 4 connected to the blow rod 5 is provided on the base 1. Gas is conducted into the blow rod 5 through the blow hole 4 to realize blow molding of the product. The outer side of the blowing rod 5 is sleeved with a transmission rod 6, which is arranged on the first fixed block 2 and passes through the second fixed block 3 upward. The bottom end of the transmission rod 6 is fixedly connected with a lever 16, which passes through the first fixed block 2 and is movably connected with a rodless cylinder 17. The lever 16 can be driven to rotate by the rodless cylinder 17, and the transmission rod 6 can be driven to rotate by the lever 16 to form a driving assembly; at the same time, the outer side of the transmission rod 6 is sleeved with a piston rod 7, and the upper end of the piston rod 7 is connected with a guide sleeve 9 sleeved on the transmission rod 6. The upper end of the transmission rod 6 is fixedly connected with a pin fixing ring 13, and the pin fixing ring 13 is arranged in the guide sleeve 9. A plurality of blocks 14 are movably connected above the pin fixing ring 13. The plurality of blocks 14 are slidably arranged along the circumferential direction of the guide sleeve 9. The guide sleeve 9 is provided with a plurality of sliding grooves for matching the blocks 14. Each block 14 is provided with an arc waist hole at the end close to the pin fixing ring 13, and the pin on the pin fixing ring 13 is movably inserted into the block The driving assembly formed by the rodless cylinder 17, the lever 16 and the transmission rod 6 can drive the pin fixing ring 13 to rotate synchronously. Through the rotation of the pin fixing ring 13, the pin on it can be driven to slide in the arc waist hole on the block 14, and the pin on the pin fixing ring 13 drives the block 14 to slide in the slide groove of the guide sleeve 9, so that the block 14 moves along the radial direction of the guide sleeve 9, that is, the driving assembly cooperates with the pin fixing ring 13, the block 14 and the guide sleeve 9 to form a locking structure. When the threaded insert 12 is sleeved on the guide sleeve 9, the lever 16 is driven to rotate by the rodless cylinder 17 of the driving assembly, driving the transmission rod 6 to rotate. Through the rotation of the transmission rod 6, the pin fixing ring 13 can be driven to rotate synchronously, and the pin on the pin fixing ring 13 drives the block 14 to extend out of the outer wall of the guide sleeve 9 along the radial direction of the guide sleeve 9, and the threaded insert 12 is stuck and fixed, so as to realize the locking of the threaded insert 12 on the guide sleeve 9. The locking structure composed of the rodless cylinder 17, the lever 16, the transmission rod 6, the pin fixing ring 13, the block 14 and the guide sleeve 9 realizes the rapid assembly of the threaded insert 12, facilitates the replacement and maintenance of the threaded insert 12, and is suitable for the processing of bottle mouths with different inner diameters, and has a wide range of applicability; the locking force formed by the block 14 is large and balanced, which ensures the stability of the threaded insert 12 when threading the product.

[0024] In the present application, the piston rod 7 is arranged on the second fixed block 3, and the connection and fixation of the piston rod 7 is realized by the second fixed block 3; the outer side of the piston rod 7 is sleeved with a cylinder barrel 8, and the cylinder barrel 8 is arranged above the second fixed block 3. Since the piston rod 7 is fixed on the second fixed block 3, the cylinder barrel 8 can move along the axial direction of the piston rod 7; a piston 18 is arranged in the middle of the piston rod 7 and is arranged in the cylinder barrel 8, and the inner cavity of the cylinder barrel 8 is divided into a first oil chamber 19 and a second oil chamber 20 by the piston 18; a first oil channel 21 and a second oil channel 22 are provided inside the side wall of the piston rod 7 along its length direction, the first oil channel 21 is connected to the first oil chamber 19, and the second oil channel 22 is connected to the second oil chamber 20. At the same time, the second fixed block 3 is provided with a first oil hole 23 connected to the first oil passage 21 and a second oil hole 24 connected to the second oil passage 22. Hydraulic oil is injected into the first oil passage 21 through the first oil hole 23, and the hydraulic oil enters the first oil chamber 19, so that the oil pressure in the first oil chamber 19 increases, and then the cylinder 8 is pushed downward to increase the volume of the first oil chamber 19, so as to achieve the downward movement of the cylinder 8; conversely, hydraulic oil is injected into the second oil passage 22 through the second oil hole 24, and the hydraulic oil enters the second oil chamber 20, so that the oil pressure in the second oil chamber 20 increases, and then the cylinder 8 is pushed upward to increase the volume of the second oil chamber 20, so as to achieve the upward movement of the cylinder 8. The front cylinder cover 10 and the cutout ring 11 sleeved on the piston rod 7 are sequentially connected to the upper part of the cylinder 8, and the threaded insert 12 is clamped on the guide sleeve 9 through multiple clamping blocks 14, and the blowing rod 5 passes through the guide sleeve 9 upward. By moving the cylinder 8 up and down, the front cylinder cover 10 and the cutout ring 11 connected to the cylinder 8 can be driven to move up and down synchronously, and then the cutout ring 11 can be driven to slide along the outer wall of the piston rod 7 and the guide sleeve 9. By moving the cutout ring 11 upward, it can resist the bottle mouth of the product and be used for downward limiting during the product blow molding process, so as to facilitate the molding of the internal thread of the bottle mouth of the product.

[0025] At the same time, the blowing needle mechanism is connected to a rotating mechanism. When the threaded insert 12 is embedded in the bottle mouth of the product, the cutting ring 11 rises and supports the bottle mouth under the action of the piston rod 7 and the cylinder 8. The rotating mechanism can drive the other structures of the blowing needle mechanism except the cylinder 8, the front cylinder cover 10, and the cutting ring 11 to rotate downward as a whole, thereby realizing the processing of the internal thread of the bottle mouth of the product.

[0026] In the present application, the blowing rod 5 and the transmission rod 6 are clearance-matched, and the gap between the blowing rod 5 and the transmission rod 6 forms a first water chamber 25, which is a circulation chamber for cooling water, so as to cool the blowing rod 5 and then cool the gas in the blowing rod 5; the transmission rod 6, the piston rod 7 and the guide sleeve 9 are clearance-matched, and the gap between the transmission rod 6, the piston rod 7 and the guide sleeve 9 forms a second water chamber 26, which is a circulation chamber for cooling water, so as to cool the piston rod 7 and the guide sleeve 9; the upper end of the first water chamber 25 is connected with the upper end of the second water chamber 26, so as to realize the connection between the cooling water in the first water chamber 25 and the second water chamber 26, forming a double-layer cooling water to absorb heat and cool down, with good heat dissipation effect, so that the product and the blowing needle mechanism can be cooled while blow molding, and the safety of the blowing needle mechanism can be improved. Among them, the first fixed block 2 is provided with a water inlet hole 27, which is connected to the first water chamber 25, and the second fixed block 3 is provided with a water outlet hole 28, which is connected to the second water chamber 26. Cooling water can be introduced into the first water chamber 25 through the water inlet hole 27, then flow into the second water chamber 26, and finally flow out through the water outlet hole 28, thereby ensuring the circulation of cooling water in the first water chamber 25 and the second water chamber 26 and improving the cooling effect.

[0027] In the present application, the upper end of the blowing rod 5 is connected with a pressure cover 15, which is covered on the guide sleeve 9, and the blocking block 14 is limited by the pressure cover 15; the pressure cover 15 is provided with a plurality of air outlet holes 29 connected with the blowing rod 5, which are used to discharge the gas in the blowing rod 5.

[0028] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the invention content within the protection scope of the present invention.

Claims

1. A blow needle mechanism for a blow molding machine, comprising a base (1), a first fixing block (2) and a second fixing block (3) being arranged in sequence on the upper side of the base (1), a blow rod (5) being connected in the middle of the base (1) and penetrating upward through the first fixing block (2) and the second fixing block (3), characterized in that: The outer side of the blowing rod (5) is sleeved with a transmission rod (6), the transmission rod (6) is arranged on the first fixed block (2) and passes through the second fixed block (3) upwards, the bottom end of the transmission rod (6) is connected to a lever (16), the lever (16) passes through the first fixed block (2) and is connected to a rodless cylinder (17), the outer side of the transmission rod (6) is sleeved with a piston rod (7), the piston rod (7) is arranged on the second fixed block (3), the outer side of the piston rod (7) is sleeved with a cylinder barrel (8), the middle of the piston rod (7) is provided with a piston (18) arranged in the cylinder barrel (8), the cylinder barrel (8) is arranged above the second fixed block (3), and the cylinder The upper part of the cylinder (8) is connected in sequence to a front cylinder cover (10) and a notch ring (11) sleeved on the piston rod (7); the upper end of the piston rod (7) is connected to a guide sleeve (9) sleeved on the transmission rod (6); the upper end of the transmission rod (6) is connected to a pin fixing ring (13); the pin fixing ring (13) is arranged in the guide sleeve (9); a plurality of clamping blocks (14) are movably connected above the pin fixing ring (13); the plurality of clamping blocks (14) are slidably arranged along the circumferential direction of the guide sleeve (9); a threaded insert (12) is clamped on the guide sleeve (9) through the plurality of clamping blocks (14); and the blowing rod (5) passes through the guide sleeve (9) upward.

2. A blow needle mechanism for a blow molding machine according to claim 1, characterized in that: The inner cavity of the cylinder (8) is divided into a first oil cavity (19) and a second oil cavity (20) by a piston (18); a first oil passage (21) and a second oil passage (22) are provided inside the side wall of the piston rod (7) along its length direction; the first oil passage (21) is connected to the first oil cavity (19), and the second oil passage (22) is connected to the second oil cavity (20).

3. A blow needle mechanism for a blow molding machine according to claim 2, characterized in that: A first oil hole (23) and a second oil hole (24) are provided on the second fixed block (3); the first oil hole (23) is connected to the first oil passage (21), and the second oil hole (24) is connected to the second oil passage (22).

4. A blow needle mechanism for a blow molding machine according to claim 1, characterized in that: The guide sleeve (9) is provided with a plurality of slide grooves for matching the clamping block (14), and each clamping block (14) is provided with an arc-shaped waist hole at the end close to the pin fixing ring (13), and the pin on the pin fixing ring (13) is movably inserted into the arc-shaped waist hole on the clamping block (14).

5. A blow needle mechanism for a blow molding machine according to claim 1, characterized in that: The shifting rod (16) is fixedly connected to the transmission rod (6), and the shifting rod (16) is movably connected to the rodless cylinder (17).

6. A blow needle mechanism for a blow molding machine according to claim 1, characterized in that: The blowing rod (5) and the transmission rod (6) are clearance-matched, and the clearance between the blowing rod (5) and the transmission rod (6) forms a first water chamber (25). The transmission rod (6), the piston rod (7) and the guide sleeve (9) are clearance-matched, and the clearance between the transmission rod (6), the piston rod (7) and the guide sleeve (9) forms a second water chamber (26). The upper end of the first water chamber (25) is connected to the upper end of the second water chamber (26).

7. A blow needle mechanism for a blow molding machine according to claim 6, characterized in that: The first fixed block (2) is provided with a water inlet hole (27), the water inlet hole (27) being connected to the first water chamber (25), and the second fixed block (3) is provided with a water outlet hole (28), the water outlet hole (28) being connected to the second water chamber (26).

8. The blow needle mechanism for a blow molding machine according to claim 1, characterized in that: The base (1) is provided with an air inlet hole (4) connected to the air blowing rod (5); the upper end of the air blowing rod (5) is connected to a pressure cover (15); the pressure cover (15) is covered on the guide sleeve (9); and the pressure cover (15) is provided with a plurality of air outlet holes (29) connected to the air blowing rod (5).

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