Synthesis kettle of methyl bromoacetate
By introducing ice bath, stirring, negative pressure and cooling mechanisms into the methyl bromoacetate synthesis kettle, the problems of artificial participation and waste of methanol volatility are solved, the reaction efficiency and safety are improved, and the efficient synthesis of methyl bromoacetate is achieved.
Patent Information
- Application Number
- CN202420353695.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-02-26
AI Technical Summary
The existing methyl bromoacetate synthetic kettle requires manual participation, which leads to an increase in workers' health risks. It is easy to evaporate and waste when synthesized using methanol, resulting in waste of raw materials and energy loss.
A methyl bromoacetate synthesis kettle including an ice bath mechanism, a feeding mechanism, a stirring mechanism, a heating mechanism, a negative pressure mechanism and a cooling mechanism are designed, and the reaction is accelerated by ice bath, negative pressure distillation and cooling recycling are accelerated by ice bath. Process, reduce manual operation and avoid volatility of methanol.
It has achieved the reduction of worker operation steps, ensure worker health, avoid methanol volatility and waste, and improved reaction efficiency and energy utilization.
Smart Images
Figure CN222152012U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of compound preparation, in particular to a synthesis kettle for methyl bromoacetate. Background Art
[0002] Methyl bromoacetate, also known as methyl bromoacetate, is an organic compound, a colorless to yellow liquid, insoluble in water, soluble in methanol and ether, and is mainly used in the synthesis of herbicides, dyes, and medicines.
[0003] The existing synthesis kettle of methyl bromoacetate, for example, a methyl bromoacetate reaction device disclosed in the utility model patent with application number 201720120345.X, has a main structure including a kettle body, a feed port, a discharge port, an air outlet, a heating layer, a baffle plate, a cylinder, a stirring blade, a support seat and a support rod, the air outlet is arranged on the side wall of the upper end of the kettle body, the feed port is arranged on the outer wall of the top of the kettle body, the discharge port is arranged on the outer wall of the bottom of the kettle body, a heating layer is arranged on the inner wall of the kettle body, a baffle plate is arranged on the side wall of the heating layer, a cylinder is arranged on the outer wall of the bottom of the kettle body, the kettle body and the cylinder are fixedly connected, a support seat is arranged on the inner wall of the bottom of the kettle body, the cylinder and the support seat are connected, and a support rod is arranged on the support seat The support seat and the support rod are fixedly connected, and a stirring blade is arranged at one end of the support rod, and the stirring blade is hinged to the support rod; when in use, when the raw materials methanol and bromoacetic acid are mixed and enter the kettle body, during the reaction process, the cylinder moves up and down to push the stirring blade to stir the reaction liquid up and down, thereby increasing the reaction rate. The setting of the baffle plate increases the collision between the raw material liquid and the baffle plate during movement, thereby increasing the stirring rate. The evaporated methanol enters the condenser through the air outlet and is condensed into liquid that enters the methanol recovery tank. The methanol in the methanol recovery tank enters the feed port through the action of the pump, and at the same time, the methanol in the methanol raw material storage tank also enters the feed port. The flow rate is adjusted by the valve and the flow meter to increase the recovery rate of the methanol.
[0004] Methyl bromoacetate is toxic and can cause harm to workers' health if it gets on their skin or is inhaled by them. However, existing methyl bromoacetate synthesis reactors generally still require manual participation, and most of the existing synthesis reactors use methanol to synthesize methyl bromoacetate, which is easy to volatilize, resulting in waste of raw materials. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a synthesis kettle for methyl bromoacetate which not only reduces the operation steps of workers and ensures the health of workers, but also does not utilize methanol to participate in the reaction, thus preventing the volatilization and waste of methanol, recycling ice water and reducing energy loss.
[0006] The utility model discloses a synthesis kettle of methyl bromoacetate, comprising an ice bath mechanism; further comprising two groups of feeding mechanisms, a stirring mechanism, a heating mechanism, a negative pressure mechanism and a cooling mechanism, wherein the two groups of feeding mechanisms are both installed on the ice bath mechanism and add raw materials into the ice bath mechanism, the stirring mechanism is installed on the ice bath mechanism and stirs and mixes the raw materials, the heating mechanism is installed on the ice bath mechanism and distills the solution after the reaction, the negative pressure mechanism is installed on the ice bath mechanism and extracts the air in the heating mechanism, and the cooling mechanism is installed on the ice bath mechanism and cools the distillate; the feeding mechanism is opened, zinc chloride and dichloromethane solution are respectively poured into the ice bath mechanism, paraformaldehyde is added under the ice bath environment of the ice bath mechanism, the stirring mechanism is started to accelerate the reaction of the raw materials, the raw materials are filtered and enter the heating mechanism after the reaction is completed, the negative pressure mechanism extracts the air in the heating mechanism, the heating mechanism heats and distills the solution after the reaction under the negative pressure environment, the distillate enters the cooling mechanism and is cooled, and the generated methyl bromoacetate solution is filled into a sealed container.
[0007] Preferably, the ice bath mechanism comprises a bracket, an outer tube, an inner tube, an ice inlet hopper, a delivery pipe, a filter plate 1 and a valve 1, the bottom end of the bracket is installed on the ground, the bottom end of the outer tube is connected to the top end of the bracket, a cooling chamber is arranged inside the outer tube, the inner tube is installed in the cooling chamber of the outer tube, a mixing chamber is arranged inside the inner tube, the ice inlet hopper is installed on the side wall of the outer tube and communicates with the inside of the cooling chamber of the outer tube, the delivery pipe is installed at the bottom end of the outer tube and communicates with the inside of the mixing chamber of the inner tube, the filter plate 1 is installed at the bottom end of the inner tube, and the valve 1 is installed on the delivery pipe; ice cubes are added into the cooling chamber of the outer tube through the ice inlet hopper, the mixing chamber of the inner tube is cooled by the ice cubes, after the liquid is mixed, the valve 1 is opened, and the mixed liquid enters the heating mechanism through the filter plate 1 and the delivery pipe.
[0008] Preferably, the feeding mechanism includes a feeding barrel, a hinge, a cover plate and a handle. The bottom end of the feeding barrel is connected to the top end of the outer barrel and communicates with the inside of the mixing chamber of the inner barrel. The hinge is rotatably mounted on the feeding barrel, the cover plate is mounted on the hinge, and the handle is mounted on the cover plate. The worker uses the handle to operate the cover plate to rotate and open it, adds raw materials such as zinc chloride, dichloromethane solution and polyformaldehyde into the mixing chamber of the inner barrel, and then uses the handle to operate the cover plate to cover the feeding barrel to prevent the liquid from volatilizing and diffusing into the air. The feeding efficiency can be improved by setting two sets of feeding mechanisms.
[0009] Preferably, the stirring mechanism includes a motor, a reducer, a transmission shaft and spiral blades, the bottom end of the motor is connected to the top of the outer cylinder, the bottom end of the reducer is connected to the top of the outer cylinder, the transmission shaft is rotatably installed in the mixing chamber of the inner cylinder and is longitudinally connected to the reducer, and the spiral blades are installed on the transmission shaft; start the motor, the motor drives the reducer to rotate, the reducer drives the transmission shaft to rotate, and the transmission shaft drives the spiral blades to rotate to stir the raw materials, thereby accelerating the reaction time of the raw materials.
[0010] Preferably, the heating mechanism includes a heating tube, two motors, two reducers, two transmission shafts and three groups of heating rods. The heating tube is installed on a bracket and a heating chamber is provided inside the heating tube. The bottom end of the two motors is connected to the bottom end of the heating tube, the bottom end of the two reducers is connected to the bottom end of the heating tube, the two transmission shafts are rotatably installed in the heating chamber of the heating tube, and the three groups of heating rods are installed on the two transmission shafts. Start the two motors, the two motors drive the two transmission shafts to rotate through the two reducers, the two transmission shafts drive the heating rods to rotate, the heating rods heat the solution after the reaction, and the liquid is distilled when the temperature is 70-80°C.
[0011] Preferably, the negative pressure mechanism includes a transmission shaft three, an air pump, an exhaust pipe and a valve two. The transmission shaft three is rotatably mounted on the reducer two, the air pump is mounted on the transmission shaft three, the exhaust pipe is mounted on the air pump and is connected to the inside of the heating chamber of the heating tube, and the exhaust pipe is provided with a valve two; the reducer two drives the transmission shaft three to rotate, the transmission shaft three starts the air pump, opens the valve two, and the air pump extracts the air in the heating chamber of the heating tube through the exhaust pipe, so that the heating tube is in a negative pressure state.
[0012] Preferably, the cooling mechanism includes a rib plate, a cooling box, a second filter plate, a water pipe, a drain pipe, a third valve and a cooling pipe, the rib plate is mounted on a bracket, the cooling box is mounted on the rib plate and a cavity is arranged inside the cooling box, the second filter plate is mounted on the bottom end of the cooling cavity of the outer tube, the water pipe is mounted on the bottom end of the outer tube and communicated with the interior of the cooling cavity of the outer tube, the water pipe is communicated with the interior of the cavity of the cooling box, the drain pipe is mounted on the side wall of the cooling box and communicated with the interior of the cavity of the cooling box, the third valve is mounted on the drain pipe, the cooling pipe is mounted in the cavity of the cooling box and communicated with the interior of the heating cavity of the heating tube; the ice cubes in the cooling cavity of the outer tube enter the cavity of the cooling box through the second filter plate and the water pipe after melting, the evaporated gas in the heating tube enters the cooling pipe, the cooling pipe performs heat exchange with ice water in the cavity of the cooling box, condenses methyl bromoacetate into liquid, and then fills it into a closed container, and after cooling is completed, the third valve is opened, and the ice water in the cavity of the cooling box is discharged through the drain pipe.
[0013] Compared with the prior art, the utility model has the following beneficial effects: opening a feeding mechanism, pouring zinc chloride and a dichloromethane solution into an ice bath mechanism respectively, adding paraformaldehyde in an ice bath environment of the ice bath mechanism, starting a stirring mechanism to accelerate the reaction of the raw materials, filtering and entering a heating mechanism after the reaction is completed, a negative pressure mechanism extracting air in the heating mechanism, the heating mechanism heating and distilling the reacted solution in a negative pressure environment, the distillate entering a cooling mechanism for cooling, and filling the generated methyl bromoacetate solution into a sealed container. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the cross-section axonometric structure of the utility model;
[0015] Figure 2 It is a schematic diagram of the cross-sectional axonometric structure of the ice bath mechanism, stirring mechanism, heating mechanism and cooling mechanism of the utility model;
[0016] Figure 3 It is a partially enlarged axonometric structural schematic diagram of the feeding mechanism of the utility model;
[0017] Figure 4 It is a front view structural diagram of the negative pressure mechanism of the utility model;
[0018] Figure 5 It is an axonometric structural diagram of the cooling mechanism of the utility model.
[0019] Markings in the attached drawings: 01, ice bath mechanism; 11, bracket; 12, outer cylinder; 13, inner cylinder; 14, ice inlet hopper; 15, delivery pipe; 16, filter plate one; 17, valve one; 02, feeding mechanism; 21, feeding cylinder; 22, hinge; 23, cover plate; 24, handle; 03, stirring mechanism; 31, motor one; 32, reducer one; 33, transmission shaft one; 34, spiral blade; 04, heating mechanism; 41, heating cylinder; 42, motor two; 43, reducer two; 44, transmission shaft two; 45, heating rod; 05, negative pressure mechanism; 51, transmission shaft three; 52, air pump; 53, exhaust pipe; 54, valve two; 06, cooling mechanism; 61, rib plate; 62, cooling box; 63, filter plate two; 64, water pipe; 65, drain pipe; 66, valve three; 67, cooling pipe. DETAILED DESCRIPTION
[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.
[0021] The utility model discloses a synthesis reactor for methyl bromoacetate, comprising an ice bath mechanism 01; further comprising two groups of feeding mechanisms 02, a stirring mechanism 03, a heating mechanism 04, a negative pressure mechanism 05 and a cooling mechanism 06, wherein the two groups of feeding mechanisms 02 are both installed on the ice bath mechanism 01 and add raw materials into the ice bath mechanism 01, the stirring mechanism 03 is installed on the ice bath mechanism 01 and stirs and mixes the raw materials, the heating mechanism 04 is installed on the ice bath mechanism 01 and distills the solution after the reaction, the negative pressure mechanism 05 is installed on the ice bath mechanism 01 and extracts the air in the heating mechanism 04, and the cooling mechanism 06 is installed on the ice bath mechanism 01 and cools the distillate; the ice bath mechanism 01 comprises a bracket 11, an outer cylinder 12, an inner cylinder 13, an outer cylinder 14, an inner cylinder 15, an outer cylinder 16, an inner cylinder 17, an inner cylinder 18, an outer cylinder 19, an inner cylinder 20, an inner cylinder 21, an inner cylinder 22, an inner cylinder 23, an inner cylinder 24, an inner cylinder 25, an inner cylinder 26, an inner cylinder 27, an inner cylinder 28, an inner cylinder 29, an inner cylinder 30, an inner cylinder 31, an inner cylinder 32, an inner cylinder 33, an inner cylinder 34, an inner cylinder 35, an inner cylinder 36, an inner cylinder 37, an inner cylinder 38, an inner cylinder 39, an outer cylinder 39, an inner cylinder 31, an inner cylinder 32, an inner cylinder 34, an inner cylinder 35, an inner cylinder 36, an inner cylinder 37, an inner cylinder 38, an inner cylinder 39, an inner cylinder 39, an inner cylinder 39, an inner cylinder 31, an inner cylinder 32, an inner The bottom end of the bracket 11 is installed on the ground, the bottom end of the outer barrel 12 is connected to the top end of the bracket 11, the outer barrel 12 is provided with a cooling chamber, the inner barrel 13 is installed in the cooling chamber of the outer barrel 12, the inner barrel 13 is provided with a mixing chamber, the ice inlet hopper 14 is installed on the side wall of the outer barrel 12 and communicates with the inside of the cooling chamber of the outer barrel 12, the delivery pipe 15 is installed at the bottom end of the outer barrel 12 and communicates with the inside of the mixing chamber of the inner barrel 13, the filter plate 16 is installed at the bottom end of the inner barrel 13, and the valve 17 is installed on the delivery pipe 15; the feeding mechanism 02 includes a feeding barrel 21, a hinge 22, a cover plate 23 and a handle 24, and the feeding barrel The bottom end of the outer cylinder 12 is connected to the top end of the outer cylinder 12 and communicates with the mixing chamber of the inner cylinder 13. The hinge 22 is rotatably mounted on the loading cylinder 21. The cover plate 23 is mounted on the hinge 22. The handle 24 is mounted on the cover plate 23. The stirring mechanism 03 includes a motor 31, a reducer 32, a transmission shaft 33 and a spiral blade 34. The bottom end of the motor 31 is connected to the top end of the outer cylinder 12. The bottom end of the reducer 32 is connected to the top end of the outer cylinder 12. The transmission shaft 33 is rotatably mounted in the mixing chamber of the inner cylinder 13 and longitudinally connected to the reducer 32. The spiral blade 34 is mounted on the transmission shaft 33. The heating mechanism 04 includes a heating cylinder 41, a motor 42, a reducer 43, a transmission shaft 44 4 and three groups of heating rods 45, the heating tube 41 is mounted on the bracket 11 and a heating chamber is arranged inside the heating tube 41, the bottom end of the motor 2 42 is connected to the bottom end of the heating tube 41, the bottom end of the reducer 2 43 is connected to the bottom end of the heating tube 41, the transmission shaft 2 44 is rotatably mounted in the heating chamber of the heating tube 41, and the three groups of heating rods 45 are mounted on the transmission shaft 2 44; the negative pressure mechanism 05 includes a transmission shaft 3 51, an air pump 52, an exhaust pipe 53 and a valve 2 54, the transmission shaft 3 51 is rotatably mounted on the reducer 2 43, the air pump 52 is mounted on the transmission shaft 3 51, the exhaust pipe 53 is mounted on the air pump 52 and is connected to the inside of the heating chamber of the heating tube 41, and the exhaust pipe 53 is provided with a valve 2 54;The cooling mechanism 06 includes a rib plate 61, a cooling box 62, a second filter plate 63, a water pipe 64, a drain pipe 65, a third valve 66 and a cooling pipe 67. The rib plate 61 is mounted on the bracket 11, the cooling box 62 is mounted on the rib plate 61 and a cavity is provided inside the cooling box 62, the second filter plate 63 is mounted on the bottom end of the cooling cavity of the outer cylinder 12, the water pipe 64 is mounted on the bottom end of the outer cylinder 12 and communicates with the cooling cavity of the outer cylinder 12, the water pipe 64 communicates with the cavity of the cooling box 62, the drain pipe 65 is mounted on the side wall of the cooling box 62 and communicates with the cavity of the cooling box 62, the third valve 66 is mounted on the drain pipe 65, and the cooling pipe 67 is mounted in the cavity of the cooling box 62 and communicates with the heating cavity of the heating cylinder 41. ;
[0022] like Figures 1 to 5 As shown, a synthesis reactor of methyl bromoacetate of the utility model, when it is working, first, the worker controls the cover plate 23 to rotate and open through the handle 24, adds raw materials such as zinc chloride, dichloromethane solution and polyformaldehyde into the mixing chamber of the inner cylinder 13, and then controls the cover plate 23 to cover the upper cylinder 21 through the handle 24 to prevent the liquid from volatilizing and diffusing into the air, and ice cubes are added into the cooling chamber of the outer cylinder 12 through the ice inlet hopper 14, and the mixing chamber of the inner cylinder 13 is cooled by the ice cubes, and the motor 2 42 drives the transmission shaft 3 51 to rotate through the reducer 2 43, and the transmission shaft 3 51 starts the air pump 52 to work, and the valve 2 54 is opened, and the air pump 52 extracts the air in the heating chamber of the heating cylinder 41 through the exhaust pipe 53, so that the heating cylinder 41 is in a negative pressure state, and after the liquid is mixed, the valve 17 is opened. The mixed liquid enters the heating cylinder 41 through the filter plate 16 and the delivery pipe 15, and the motor 42 is started. The motor 42 drives the transmission shaft 44 to rotate through the reducer 43, and the transmission shaft 44 drives the heating rod 45 to rotate. The heating rod 45 heats the reacted solution. The liquid is distilled when the temperature is 70-80°C. The ice cubes in the cooling cavity of the outer cylinder 12 enter the cavity of the cooling box 62 through the filter plate 63 and the water pipe 64 after melting. The evaporated gas in the heating cylinder 41 enters the cooling pipe 67. The cooling pipe 67 exchanges heat with the ice water in the cavity of the cooling box 62 to condense the methyl bromoacetate into liquid, which is then filled into a closed container. After cooling, the valve 3 66 is opened, and the ice water in the cavity of the cooling box 62 is discharged through the drain pipe 65.
[0023] The motor 31, reducer 32, motor 42, reducer 43 and air pump 52 of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in this field to make creative efforts.
[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A synthesis reactor for methyl bromoacetate, comprising an ice bath mechanism (01); characterized in that: The invention also comprises two sets of feeding mechanisms (02), a stirring mechanism (03), a heating mechanism (04), a negative pressure mechanism (05) and a cooling mechanism (06). The two sets of feeding mechanisms (02) are both installed on the ice bath mechanism (01) and add raw materials into the ice bath mechanism (01). The stirring mechanism (03) is installed on the ice bath mechanism (01) and stirs and mixes the raw materials. The heating mechanism (04) is installed on the ice bath mechanism (01) and distills the solution after the reaction. The negative pressure mechanism (05) is installed on the ice bath mechanism (01) and extracts the air in the heating mechanism (04). The cooling mechanism (06) is installed on the ice bath mechanism (01) and cools the distillate.
2. A synthesis reactor for methyl bromoacetate as claimed in claim 1, characterized in that, The ice bath mechanism (01) comprises a support (11), an outer cylinder (12), an inner cylinder (13), an ice inlet hopper (14), a delivery pipe (15), a filter plate (16) and a valve (17). The bottom end of the support (11) is mounted on the ground, the bottom end of the outer cylinder (12) is connected to the top end of the support (11), a cooling chamber is arranged inside the outer cylinder (12), the inner cylinder (13) is mounted in the cooling chamber of the outer cylinder (12), a mixing chamber is arranged inside the inner cylinder (13), the ice inlet hopper (14) is mounted on the side wall of the outer cylinder (12) and communicates with the inside of the cooling chamber of the outer cylinder (12), the delivery pipe (15) is mounted at the bottom end of the outer cylinder (12) and communicates with the inside of the mixing chamber of the inner cylinder (13), the filter plate (16) is mounted at the bottom end of the inner cylinder (13), and the valve (17) is mounted on the delivery pipe (15).
3. A synthesis reactor for methyl bromoacetate as claimed in claim 2, characterized in that, The feeding mechanism (02) comprises a feeding barrel (21), a hinge (22), a cover plate (23) and a handle (24); the bottom end of the feeding barrel (21) is connected to the top end of the outer barrel (12) and communicates with the interior of the mixing chamber of the inner barrel (13); the hinge (22) is rotatably mounted on the feeding barrel (21); the cover plate (23) is mounted on the hinge (22); and the handle (24) is mounted on the cover plate (23).
4. A synthesis reactor for methyl bromoacetate as claimed in claim 2, characterized in that, The stirring mechanism (03) comprises a motor (31), a reducer (32), a transmission shaft (33) and a spiral blade (34). The bottom end of the motor (31) is connected to the top end of the outer cylinder (12), the bottom end of the reducer (32) is connected to the top end of the outer cylinder (12), the transmission shaft (33) is rotatably mounted in the mixing chamber of the inner cylinder (13) and is longitudinally connected to the reducer (32), and the spiral blade (34) is mounted on the transmission shaft (33).
5. A synthesis reactor for methyl bromoacetate as claimed in claim 2, characterized in that, The heating mechanism (04) comprises a heating tube (41), a second motor (42), a second reducer (43), a second transmission shaft (44) and three groups of heating rods (45); the heating tube (41) is mounted on a bracket (11) and a heating chamber is arranged inside the heating tube (41); the bottom end of the second motor (42) is connected to the bottom end of the heating tube (41); the bottom end of the second reducer (43) is connected to the bottom end of the heating tube (41); the second transmission shaft (44) is rotatably mounted in the heating chamber of the heating tube (41); and the three groups of heating rods (45) are mounted on the second transmission shaft (44).
6. A synthesis reactor for methyl bromoacetate as claimed in claim 5, characterized in that, The negative pressure mechanism (05) comprises a transmission shaft three (51), an air pump (52), an air extraction pipe (53) and a valve two (54); the transmission shaft three (51) is rotatably mounted on the reducer two (43); the air pump (52) is mounted on the transmission shaft three (51); the air extraction pipe (53) is mounted on the air pump (52) and is connected to the interior of the heating chamber of the heating cylinder (41); and the air extraction pipe (53) is provided with a valve two (54).
7. A synthesis reactor for methyl bromoacetate as claimed in claim 5, characterized in that: The cooling mechanism (06) comprises a rib plate (61), a cooling box (62), a second filter plate (63), a water pipe (64), a drain pipe (65), a third valve (66) and a cooling pipe (67). The rib plate (61) is mounted on the bracket (11), the cooling box (62) is mounted on the rib plate (61) and a cavity is provided inside the cooling box (62), the second filter plate (63) is mounted on the bottom end of the cooling cavity of the outer cylinder (12), the water pipe (64) is mounted on the bottom end of the outer cylinder (12) and communicates with the interior of the cooling cavity of the outer cylinder (12), the water pipe (64) is communicated with the interior of the cavity of the cooling box (62), the drain pipe (65) is mounted on the side wall of the cooling box (62) and communicates with the interior of the cavity of the cooling box (62), the third valve (66) is mounted on the drain pipe (65), and the cooling pipe (67) is mounted in the cavity of the cooling box (62) and communicates with the interior of the heating cavity of the heating cylinder (41).