Bottle preform heating device and bottle blowing machine

Abstract

The invention belongs to the technical field of blow molding, and discloses a bottle preform heating device and a bottle blowing machine. According to the bottle blank heating device, a first rotating disc can rotate around the central axis of the first rotating disc, and a first sliding rail is fixedly connected to a rack, extends in the circumferential direction of the first rotating disc and is fixedly connected to the rack; the sliding rod assembly is slidably connected to the first rotating disc in the central axis direction, and when the sliding rod assembly slides to the protruding part, the clamping hands can grab bottle blanks; the driving part is fixed to the rack, the output end of the driving part is in transmission connection with the abutting part, and the driving part can drive the abutting part to move in the central axis direction so as to abut against or be away from the sliding rod assembly, so that the heating head can be switched between the working position and the avoiding position, and when the rotating frequency of the first rotating disc is not matched with the clamping frequency of the clamping hand, the heating head can be switched between the working position and the avoiding position. And the heating head moves to the avoiding position, so that the heating head is prevented from colliding with the clamping hand. According to the bottle blowing machine, the bottle blank heating device is applied, so that when the bottle blowing machine is used for producing plastic bottles, the heating head is prevented from being collided by clamping hands.

Description

Technical Field

[0001] The invention relates to the technical field of blow molding, and in particular to a preform heating device and a bottle blowing machine. Background Art

[0002] Hollow blow molding is a process for manufacturing hollow thermoplastic parts. After the bottle blank held by the heating head is heated by an infrared lamp, the gripper takes the bottle blank on the heating head and blows it up to make a plastic bottle.

[0003] In the process of producing plastic bottles by hollow blow molding, several heating heads are arranged on the turntable, and the preforms are mounted on the heating heads. The turntable rotates continuously to send the preforms to the clamping station. The grippers are located at the clamping station to clamp the heated preforms and transfer them to the blow molding station. However, the rotation frequency of the turntable may not be compatible with the gripping frequency of the grippers, resulting in collision between the grippers and the heating heads and damage to the heating heads. Summary of the invention

[0004] The object of the present invention is to provide a preform heating device and a bottle blowing machine, which can protect a heating head from being hit by a gripper when the rotation frequency of a turntable is not compatible with the gripping frequency of a gripper.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A preform heating device is provided, the preform heating device comprising:

[0007] frame;

[0008] A turntable assembly is arranged relative to the frame, the turntable assembly includes a first turntable and a first slide rail, the first turntable can rotate around its central axis, the first slide rail is fixedly connected to the frame and extends along the circumference of the first turntable and is fixedly connected to the frame, and the first slide rail has a protrusion;

[0009] A slide bar assembly, wherein a plurality of slide bar assemblies are arranged around the central axis of the first turntable, the slide bar assembly is slidably connected to the first turntable along the direction of the central axis and can move with the first turntable, the slide bar assembly is slidably matched with the first slide rail and can slide along the extension direction of the first slide rail, the heating head is arranged on the slide bar assembly, and the bottle blank is sleeved on the heating head; when the slide bar assembly slides to the protruding portion, the gripper can grab the bottle blank;

[0010] The protection component includes a driving member and a pressing member, the driving member is fixed on the frame, the output end of the driving member is in transmission connection with the pressing member, and the driving member can drive the pressing member to move along the central axis direction to press against or away from the slide bar assembly, so that the heating head can switch between the working position and the avoidance position;

[0011] Infrared lamp tube, the infrared lamp tube can heat the bottle blank mounted on the heating head.

[0012] Preferably, the slide rod assembly includes a first slide rod, a first through hole is provided on the first turntable, the first slide rod passes through the first through hole and can clamp the heating head, and the first slide rod is slidably matched with the first through hole and can move in the vertical direction.

[0013] Preferably, the first sliding rod includes a straight sliding rod and a clamping piece, one end of the straight sliding rod is fixedly connected to the clamping piece, the clamping piece is used to clamp the heating head, and the straight sliding rod is slidably matched with the first perforation and can move in the vertical direction.

[0014] Preferably, the slide bar assembly further includes a second slide bar, the first turntable is provided with a second through hole slidably matched with the second slide bar, the second slide bar passes through the second through hole, and one end of the second slide bar is fixedly connected to the clamping member.

[0015] Preferably, the slide rod assembly also includes a slide rod mounting base and a first roller. The slide rod mounting base is fixed on the straight slide rod and can move in the vertical direction. The rotating shaft of the first roller is rotatably connected to the slide rod mounting base. When the heating head is in the working position, the first roller slides in cooperation with the first slide rail.

[0016] Preferably, the slide rod assembly also includes an elastic member, the slide rod mounting base is located between the clamping member and the first turntable, one end of the elastic member is fixedly connected to the first turntable, and the other end is fixedly connected to the slide rod mounting base, and the elastic member is in a free state when the heating head is in the working position, and is in a compressed state when the heating head is in the avoidance position.

[0017] Preferably, the pressure member is a second slide rail, the output end of the driving member is fixedly connected to the second slide rail, the slide rod assembly also includes a second roller, the second roller is coaxially arranged with the first roller, and its axis is rotatably connected to the slide rod mounting base, and the second slide rail and the second roller can slide together.

[0018] Preferably, the protection component also includes a mounting bracket, the driving member is fixed on the mounting bracket, a waist-shaped hole is provided on the frame, the driving member is fixed to the mounting bracket by fasteners passing through the waist-shaped hole, and the waist-shaped hole extends along the rotation direction of the first turntable.

[0019] Preferably, the protection assembly further includes a limiter, which is fixed on the frame and is used to limit the maximum distance that the second slide rail moves in the vertical direction.

[0020] Preferably, the preform heating device also includes a detection control module, which is respectively communicatively connected with the gripper, the first turntable and the driving member, and the detection control module can detect the operating frequency of the gripper and the first turntable and control the driving member to drive the slide bar assembly to move in the vertical direction.

[0021] On the second aspect, a bottle blowing machine is provided, which is characterized in that it includes the above-mentioned bottle blank heating device, heating head, clamping hand and blow molding station. When the sliding rod assembly slides to the protrusion, if the heating head is in the working position, the clamping hand can grab the bottle blank. If the heating head is in the avoidance position, the clamping hand avoids the bottle blank, and the blow molding station can blow the bottle blank to produce plastic bottles.

[0022] Beneficial effects of the present invention:

[0023] The preform heating device provided by the present invention makes the first turntable rotate around its central axis, the first slide rail extends along the circumference of the first turntable and is fixedly connected to the frame, a plurality of slide bar assemblies are arranged around the central axis of the first turntable, the slide bar assembly is slidably connected to the first turntable along the direction of its central axis, the slide bar assembly and the first slide rail slide in the extension direction of the first slide rail, the slide bar assembly clamps the heating head, the first slide rail has a protrusion, when the slide bar assembly slides to the protrusion, the clamping hand grabs the preform, so that the first turntable clamps multiple heating heads and the infrared lamp tube heats multiple preforms at the same time, the clamping hand can sequentially The bottle blank mounted on the heating head is grabbed and sent to the blow molding station to make a plastic bottle; the pressing piece is located on one side of the protrusion, the driving piece is fixed on the frame, and the output end of the driving piece is fixedly connected to the pressing piece so that the pressing piece can be moved in the vertical direction to press or move away from the slide bar assembly, so that the heating head can be switched between a working position where the gripper can grab the bottle blank and an avoidance position where the gripper avoids the heating head. Therefore, when the rotation frequency of the first turntable is not compatible with the gripping frequency of the gripper, the staff can manually control the driving piece 41 to move the heating head to the avoidance position to prevent the heating head from colliding with the gripper.

[0024] The preform heating device provided by the present invention comprises the above-mentioned preform heating device, a heating head, a clamp and a blow molding station. When the slide bar assembly slides to the raised portion, if the heating head is in the working position, the clamp can grab the preform. If the heating head is in the avoidance position, the clamp avoids the preform, and the blow molding station can blow the preform to produce plastic bottles. Therefore, when the blow molding machine produces plastic bottles, the heating head is not bumped by the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the preform heating device provided by the present invention;

[0026] Figure 2 It is a cross-sectional schematic diagram of the preform heating device provided by the present invention.

[0027] In the figure:

[0028] 100, heating head; 200, clamping hand;

[0029] 1. Frame; 11. Waist-shaped hole;

[0030] 2. Turntable assembly; 21. first turntable; 211. first through hole; 212. second through hole; 22. first slide rail; 221. raised portion; 23. second turntable;

[0031] 3. Slide bar assembly; 31. First slide bar; 311. Straight slide bar; 312. Clamping member; 32. Second slide bar; 33. Slide bar mounting base; 34. First roller; 35. Elastic member; 36. Second roller;

[0032] 4. Protection component; 41. Driving member; 42. Pressing member; 43. Mounting bracket; 44. Limiting member. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, 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 limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] In the process of producing plastic bottles by hollow blow molding, a number of heating heads are arranged on the turntable, and the preforms are mounted on the heating heads. The turntable rotates continuously to send the preforms to the clamping station, and the grippers are located at the clamping station to grip the heated preforms and then transfer them to the blow molding station. However, the rotation frequency of the turntable is often not compatible with the gripping frequency of the grippers, which is the direct cause of the collision between the grippers and the heating heads. Therefore, when the rotation frequency of the turntable is not compatible with the gripping frequency of the grippers, making the grippers avoid the heating heads is the key to solving the above technical problems. Figure 1 to Figure 2 The preform heating device provided by the present invention is introduced in detail.

[0038] Figure 1 The structure diagram of the preform heating device provided in this embodiment is shown. Figure 2 FIG. 2 shows a cross-sectional schematic diagram of the preform heating device provided in this embodiment. Figure 1 to Figure 2As shown, the preform heating device provided in this embodiment includes a frame 1, a turntable assembly 2, a slide assembly 3, a protection assembly 4 and an infrared lamp; the turntable assembly 2 is arranged relative to the frame 1, and the turntable assembly 2 includes a first turntable 21 and a first slide rail 22, the first turntable 21 can rotate around its central axis, the first slide rail 22 is fixedly connected to the frame 1 and extends along the circumference of the first turntable 21 and is fixedly connected to the frame 1, and the first slide rail 22 has a protrusion 221; a plurality of slide assemblies 3 are arranged around the central axis of the first turntable 21, the slide assembly 3 is slidably connected to the first turntable 21 along the central axis direction and can move with the first turntable 21, and the slide assembly 3 The heating head 100 is arranged on the slide bar assembly 3, and the bottle blank is sleeved on the heating head 100, which is slidably matched with the first slide rail 22 and can slide along the extension direction of the first slide rail 22; when the slide bar assembly 3 slides to the protrusion 221, the clamp 200 can grab the bottle blank; the protection assembly 4 includes a driving member 41 and a pressing member 42, the driving member 41 is fixed on the frame 1, and the output end of the driving member 41 is transmission-connected with the pressing member 42, the driving member 41 can drive the pressing member 42 to move along the central axis direction to press or move away from the slide bar assembly 3, so that the heating head 100 can switch between the working position and the avoidance position; the infrared lamp tube can heat the bottle blank sleeved on the heating head 100. It should be noted that when the heating head 100 is in the working position, the slide assembly 3 slides to the protrusion 221, and the gripper 200 can grab the bottle blank. When the heating head 100 is in the avoidance position, the slide assembly 3 slides to the protrusion 221, and the gripper 200 avoids the bottle blank and cannot grab the bottle blank. In order to prevent the bottle blank from cooling and sticking to the heating head 100, the heating head 100 must keep heating the bottle blank. In order to continuously produce plastic bottles, the first turntable 21 keeps rotating, even if the rotation frequency of the first turntable 21 is not compatible with the gripping frequency of the gripper 200, and the pressing member 4 When the pressing slide bar assembly 3 moves the heating head 100 to the avoidance position, the first turntable 21 still needs to keep rotating, so that when the staff adjusts the rotation frequency of the first turntable 21 and the clamping frequency of the clamping hand 200 to make the two compatible, the pressing member 42 moves the heating head 100 to the working position, so that the clamping hand 200 can continue to clamp the bottle blank to resume production; the number of slide bar assemblies 3 is not limited here, and can be 2, 3, 5, or 10. Those skilled in the art can reasonably set them according to the actual needs of producing plastic bottles, and will not be repeated here. .

[0039] The preform heating device provided in this embodiment rotates the first turntable 21 around its central axis, and the first slide rail 22 extends along the circumference of the first turntable 21 and is fixedly connected to the frame 1. A plurality of slide bar assemblies 3 are arranged around the central axis of the first turntable 21. The slide bar assemblies 3 are slidably connected to the first turntable 21 along the direction of its central axis and can move in the vertical direction. The slide bar assembly 3 and the first slide rail 22 are slidably matched and can slide along the extension direction of the first slide rail 22. The slide bar assembly 3 clamps the heating head 100, and the first slide rail 22 has a protrusion 221. When the slide bar assembly 3 slides to the protrusion 221, the clamping hand 200 grabs the preform, so that the first turntable 21 clamps multiple heating heads 100 and the infrared lamp tube heats multiple preforms at the same time. The clamping hand 200 can sequentially grab the preforms mounted on the heating head 100 and send them to the blow molding station to make plastic bottles; the pressing member 42 is located on one side of the protrusion 221, the driving member 41 is fixed on the frame 1, and the output end of the driving member 41 is fixedly connected to the pressing member 42 so that the pressing member 42 can be moved in the vertical direction to press or move away from the slide bar assembly 3, so that the heating head 100 can switch between the working position where the clamping hand 200 can grab the preform and the avoidance position where the clamping hand 200 avoids the heating head 100. Therefore, when the rotation frequency of the first turntable 21 is not compatible with the clamping frequency of the clamping hand 200, the staff can manually control the driving member 41 to move the heating head 100 to the avoidance position to prevent the heating head 100 from colliding with the clamping hand 200.

[0040] Continue as Figure 1 to Figure 2 As shown, the slide bar assembly 3 includes a first slide bar 31. A first through hole 211 is provided on the first turntable 21. The first slide bar 31 passes through the first through hole 211 and can clamp the heating head 100. The first slide bar 31 and the first through hole 211 are slidably matched and can move in the vertical direction, so that the first through hole 211 can guide the movement direction of the first slide bar 31, ensuring the smoothness of the movement of the slide bar assembly 3, so as to ensure the spatial position accuracy of the heating head 100 when it moves from the avoidance position to the working position, so that the clamping hand 200 can more easily clamp the bottle blank mounted on the heating head 100. Specifically, the first slide bar 31 includes a straight slide bar 311 and a clamping piece 312. One end of the straight slide bar 311 is fixedly connected to the clamping piece 312. The clamping piece 312 is used to clamp the heating head 100. The straight slide bar 311 slides with the first perforation 211 and can move in the vertical direction. Therefore, when the clamping hand 200 collides with the heating head 100 and causes the clamping piece 312 to be twisted and deformed due to force, the first slide bar 31 can be quickly repaired by replacing the clamping piece 312, so that the first slide bar 31 can clamp the heating head 100 normally, thereby reducing the difficulty of maintaining the turntable.

[0041] Continue as Figure 1 to Figure 2As shown, the slide bar assembly 3 also includes a second slide bar 32. The first turntable 21 is provided with a second through hole 212 that slides with the second slide bar 32. The second slide bar 32 passes through the second through hole 212. One end of the second slide bar 32 is fixedly connected to the clamping member 312, so that the double slide bar structure can be used to further improve the transmission stability of the slide bar assembly 3, and it can also prevent the first slide bar 31 from rotating when the first slide bar 31 moves in the vertical direction, thereby preventing the first slide bar 31 from rotating and causing the clamping member 312 to rotate, thereby driving the heating head 100 clamped by the clamping member 312 to rotate, causing the clamping hand 200 to be unable to clamp the bottle blank mounted on the heating head 100.

[0042] Continue as Figure 1 to Figure 2 As shown, the turntable assembly 2 also includes a second turntable 23, which is coaxial with the first turntable 21 and spaced apart. The second turntable 23 is provided with a third through hole slidably matched with the first slide bar 31 and a fourth through hole slidably matched with the second slide bar 32. The number of the third through holes is the same as that of the first slide bar 31 and corresponds one to one. The number of the fourth through holes is the same as that of the second slide bar 32 and corresponds one to one, thereby further improving the transmission stability of the lifting slide bar assembly 3 to ensure the spatial position accuracy of the heating head 100 when it moves from the avoidance position to the working position, so that the clamping hand 200 can more easily clamp the bottle blank mounted on the heating head 100.

[0043] Preferably, the first perforation 211, the second perforation 212, the third perforation and the fourth perforation are all sleeved with a sleeve, and the first slide bar 31 and the second slide bar 32 are both slidably matched with the sleeve, so as to prevent the perforations set on the turntable from being worn due to long-term use, and also prevent the first slide bar 31 or the second slide bar 32 from being worn, thereby causing the transmission stability to decrease. It should be noted that the sleeve is made of a self-lubricating material, such as brass or copper, and any material with self-lubricating properties that can prevent the first slide bar 31 or the second slide bar 32 from being worn is within the scope of protection of the present invention, and will not be repeated here.

[0044] Continue as Figure 1 to Figure 2 As shown, the slide bar assembly 3 also includes a slide bar mounting base 33 and a first roller 34. The slide bar mounting base 33 is fixed on the straight slide bar 311 and can move in the vertical direction. The rotating shaft of the first roller 34 is rotatably connected to the slide bar mounting base 33. When the heating head 100 is in the working position, the first roller 34 slides with the first slide rail 22, so that when the first turntable 21 rotates, the clamping hand 200 continuously clamps the bottle blank mounted on the heating head 100 and produces plastic bottles normally. In this process, the friction between the slide bar assembly 3 and the first slide rail 22 is reduced to prevent the first slide bar 31 from sliding directly with the first slide rail 22 for a long time, which may cause the first slide bar 31 to wear, so as to ensure the spatial position accuracy of the heating head 100 when it moves from the avoidance position to the working position.

[0045] Continue as Figure 1 to Figure 2 As shown, the slide bar assembly 3 also includes an elastic member 35, and the slide bar mounting base 33 is located between the clamping member 312 and the first rotating disk 21. One end of the elastic member 35 is fixedly connected to the first rotating disk 21, and the other end is fixedly connected to the slide bar mounting base 33. The elastic member 35 is in a free state when the heating head 100 is in the working position, and in a compressed state when the heating head 100 is in the avoidance position. Therefore, when the heating head 100 collides with the clamping hand 200, the protection assembly 4 makes the heating head 100 switch to the avoidance position. After the staff adjusts the rotation frequency of the rotating disk and the clamping frequency of the clamping hand 200 to make the two compatible, the heating head 100 can use the elastic force provided by the elastic member 35 to quickly switch the heating head 100 to the working position. Specifically, the elastic member 35 is a spring, which is sleeved on the first sliding bar 31 or the second sliding bar 32. One end of the spring is fixedly connected to the first rotating disk 21, and the other end is fixedly connected to the slide bar mounting base 33.

[0046] Continue as Figure 1 to Figure 2 As shown, the pressing member 42 is a second slide rail, and the output end of the driving member 41 is fixedly connected to the second slide rail. The slide bar assembly 3 also includes a second roller 36, which is coaxially arranged with the first roller 34, and its axis is rotatably connected to the slide bar mounting base 33. The second slide rail and the second roller 36 are slidably matched, so that when the driving member 41 drives the second guide rail to move in the vertical direction to press the second roller 36, the first turntable 21 continues to rotate, thereby reducing the friction between the second guide rail and the slide bar assembly 3, preventing the pressing member 42 from being worn due to long-term use.

[0047] Continue as Figure 1 to Figure 2 As shown, the protection component 4 also includes a mounting bracket 43, the driving member 41 is fixed on the mounting bracket 43, and a waist-shaped hole 11 is provided on the frame 1. The driving member 41 is fixed to the mounting bracket 43 by passing a fastener through the waist-shaped hole 11. The waist-shaped hole 11 extends along the rotation direction of the first turntable 21, so that the relative position of the pressing member 42 relative to the protrusion can be adjusted along the rotation direction of the first turntable 21 to ensure that the pressing member 42 can press the second roller 36 when the first roller 34 moves to the protrusion position, so that the heating head 100 switches to the avoidance position to prevent the heating head 100 from colliding with the clamp 200.

[0048] Continue as Figure 1 to Figure 2As shown, the protection assembly 4 further includes a limiter 44, which is fixed to the frame 1 and is used to limit the maximum distance that the second slide rail moves in the vertical direction, thereby ensuring that the second slide rail presses against the first roller 34 to switch the heating head 100 to an avoidance position where the clamping hand 200 avoids the heating head 100. Specifically, the limiter 44 is a limiter bolt, and the frame 1 has a first threaded through hole. The limiter bolt and the threaded through hole are threadedly matched, so that the limiter bolt can be further screwed to allow the limiter bolt to pass through the first threaded through hole, and the length of the limiter bolt extending out of the first threaded through hole is adjusted according to the degree of screwing, thereby limiting the maximum distance that the second slide rail moves in the vertical direction.

[0049] Continue as Figure 1 to Figure 2 As shown, the preform heating device also includes a detection control module, which is respectively connected to the gripper 200, the first turntable 21 and the drive 41 in communication, and the detection control module can detect the working frequency of the gripper 200 and the first turntable 21 and control the drive 41 to drive the slide bar assembly 3 to move in the vertical direction, so that the rotation frequency of the first turntable 21 and the clamping frequency of the gripper 200 can be automatically monitored, and when the frequencies of the two are not matched, the drive 41 automatically switches the heating head 100 to the avoidance position to prevent the heating head 100 from colliding with the gripper 200. After the staff adjusts the rotation frequency of the first turntable 21 and the clamping frequency of the gripper 200, the heating head 100 is automatically switched to the working position, thereby resuming the production of plastic bottles. Specifically, the detection control module can be a microcontroller connected to a speed sensor, the speed sensor can detect the rotation frequency of the first turntable 21 and the clamping frequency of the gripper 200, and the microcontroller can control the drive 41 to drive the slide bar assembly 3 to move in the vertical direction.

[0050] The present invention also provides a bottle blowing machine, comprising the above-mentioned preform heating device, a heating head 100, a clamp 200 and a blow molding station. When the slide bar assembly 3 slides to the protrusion 221, if the heating head 100 is in the working position, the clamp 200 can grab the preform. If the heating head 100 is in the avoidance position, the clamp 200 avoids the preform, and the blow molding station can blow the preform to produce plastic bottles. Therefore, when the bottle blowing machine produces plastic bottles, the heating head 100 is not bumped by the clamp 200.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A preform heating device, characterized in that: The preform heating device comprises: Rack (1); A turntable assembly (2) is arranged relative to the frame (1), the turntable assembly (2) comprising a first turntable (21) and a first slide rail (22), the first turntable (21) being capable of rotating about its central axis, the first slide rail (22) being fixedly connected to the frame (1) and extending along the circumference of the first turntable (21) and fixedly connected to the frame (1), the first slide rail (22) having a protrusion (221); A slide bar assembly (3), wherein a plurality of the slide bar assemblies (3) are arranged around the central axis of the first turntable (21); the slide bar assembly (3) is slidably connected to the first turntable (21) along the direction of the central axis and can move with the first turntable (21); the slide bar assembly (3) is slidably matched with the first slide rail (22) and can slide along the extension direction of the first slide rail (22); a heating head (100) is arranged on the slide bar assembly (3), and a bottle blank is sleeved on the heating head (100); when the slide bar assembly (3) slides to the protruding portion (221), the gripper (200) can grab the bottle blank; A protection component (4), the protection component (4) comprising a driving member (41) and a pressing member (42), the driving member (41) being fixed on the frame (1), the output end of the driving member (41) being in driving connection with the pressing member (42), the driving member (41) being capable of driving the pressing member (42) to move along the central axis direction to press against or away from the slide bar component (3), so that the heating head (100) can switch between a working position and an avoidance position; An infrared lamp tube, wherein the infrared lamp tube can heat the bottle blank sleeved on the heating head (100).

2. The preform heating device according to claim 1, characterized in that: The slide bar assembly (3) comprises a first slide bar (31), a first through hole (211) is provided on the first turntable (21), the first slide bar (31) passes through the first through hole (211) and can clamp the heating head (100), and the first slide bar (31) is slidably matched with the first through hole (211) and can move in a vertical direction.

3. The preform heating device according to claim 2, characterized in that: The first sliding rod (31) includes a straight sliding rod (311) and a clamping piece (312), one end of the straight sliding rod (311) is fixedly connected to the clamping piece (312), the clamping piece (312) is used to clamp the heating head (100), and the straight sliding rod (311) is slidably matched with the first through hole (211) so as to be able to move in the vertical direction.

4. The preform heating device according to claim 3, characterized in that: The slide bar assembly (3) further comprises a second slide bar (32); a second through hole (212) slidably matched with the second slide bar (32) is provided on the first turntable (21); the second slide bar (32) passes through the second through hole (212); one end of the second slide bar (32) is fixedly connected to the clamping member (312).

5. The preform heating device according to claim 3, characterized in that: The slide bar assembly (3) also includes a slide bar mounting base (33) and a first roller (34); the slide bar mounting base (33) is fixed on the straight slide bar (311) and can move in a vertical direction; the rotating shaft of the first roller (34) is rotatably connected to the slide bar mounting base (33); when the heating head (100) is in a working position, the first roller (34) slides in cooperation with the first slide rail (22).

6. The preform heating device according to claim 5, characterized in that: The slide bar assembly (3) also includes an elastic member (35), the slide bar mounting base (33) is located between the clamping member (312) and the first turntable (21), one end of the elastic member (35) is fixedly connected to the first turntable (21), and the other end is fixedly connected to the slide bar mounting base (33), and the elastic member (35) is in a free state when the heating head (100) is in a working position, and is in a compressed state when the heating head (100) is in a avoidance position.

7. The preform heating device according to claim 6, characterized in that: The pressing member (42) is a second slide rail, and the output end of the driving member (41) is fixedly connected to the second slide rail. The slide bar assembly (3) also includes a second roller (36), and the second roller (36) is coaxially arranged with the first roller (34), and its axis is rotatably connected to the slide bar mounting base (33), and the second slide rail and the second roller (36) can slide together.

8. The preform heating device according to claim 7, characterized in that: The protection assembly (4) further comprises a mounting bracket (43), the driving member (41) being fixed on the mounting bracket (43), the frame (1) being provided with a waist-shaped hole (11), the driving member (41) being fixed on the mounting bracket (43) by means of a fastener passing through the waist-shaped hole (11), the waist-shaped hole (11) extending along the rotation direction of the first turntable (21).

9. The preform heating device according to claim 7, characterized in that: The protection assembly (4) further comprises a limiting member (44), wherein the limiting member (44) is fixed on the frame (1) and is used to limit the maximum distance that the second slide rail moves in the vertical direction.

10. The preform heating device according to any one of claims 1 to 9, characterized in that: The preform heating device also includes a detection control module, which is respectively connected to the gripper (200), the first turntable (21) and the drive member (41) for communication. The detection control module is capable of detecting the operating frequencies of the gripper (200) and the first turntable (21) and controlling the drive member (41) to drive the slide bar assembly (3) to move in a vertical direction.

11. A bottle blowing machine, characterized in that: It comprises a preform heating device, a heating head (100), a gripper (200) and a blow molding station as described in any one of claims 1 to 10. When the slide bar assembly (3) slides to the protruding portion (221), if the heating head (100) is in a working position, the gripper (200) can grasp the preform; if the heating head (100) is in an avoidance position, the gripper (200) avoids the preform, and the blow molding station can blow the preform to produce a plastic bottle.

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