A dispensing device for preparing liquid raw materials from pharmaceutical intermediates

Abstract

The present invention relates to the technical field of precise fluid distribution and delivery, and in particular to a distribution and delivery device for preparing liquid raw materials from pharmaceutical intermediates, comprising a diaphragm pump housing, a diaphragm installed on the inner wall of the diaphragm pump housing, a support plate slidingly provided on the inner wall of one side of the diaphragm pump housing, a transmission rod rotatably connected to the upper inner wall of the diaphragm pump housing, a rotating shaft rotatably provided on the lower inner wall of the diaphragm pump housing, a rotating sleeve rotatably provided on the inner wall of one side of the diaphragm pump housing, a push-pull mechanism rotatably provided on the outer wall of the rotating sleeve, a sleeve rod slidably provided in the rotating sleeve, and a diaphragm scraping rod slidably provided on the other end of the sleeve rod. By arranging the rotating sleeve, the sleeve rod and the diaphragm scraping rod, the diaphragm scraping rod can be driven to reciprocate while rotating, and the scale on the side of the diaphragm in the diaphragm pump that contacts the liquid can be automatically scraped off, thereby maintaining smooth operation of the diaphragm and ensuring the normal operation of the pump, thereby improving the stability and accuracy of liquid delivery.

Description

Technical Field

[0001] The present invention relates to the technical field of precise fluid distribution and delivery, and in particular to a distribution and delivery device for preparing liquid raw materials from pharmaceutical intermediates. Background Art

[0002] Liquid raw material dispensing devices for the preparation of pharmaceutical intermediates are used for the precise delivery and mixing of different liquid raw materials and are widely used in the pharmaceutical and chemical industries. These devices typically require high precision, high efficiency, and excellent hygiene standards to ensure that liquids delivered during the production process are not contaminated and that parameters such as flow rate, pressure, and temperature are stably controlled.

[0003] The document with the prior art publication number CN112594173A provides a precision dispensing device for liquid raw materials for pharmaceutical preparation. By controlling a stepper motor, the coupling is driven, which in turn drives a micrometer screw to push a flexible rubber diaphragm 2 to change the compression of the spring; or by controlling the excitation coil to generate a magnetic field, the magnetically controlled shape memory alloy is controlled to achieve axial deformation, which pushes the flexible rubber diaphragm 2 through this deformation to achieve the effect of pushing forward and rebounding. The flexible rubber diaphragm 2 pushes forward, driving the connecting rod, which drives the movement of the flexible rubber diaphragm 1, causing the volume in the left chamber of the cavity 1 to change, and liquid enters from the upper pipe joint and flows out from the lower pipe joint. When the connecting rod pushes the flexible rubber diaphragm 1, the float 2 in the lower pipe joint descends, and the liquid flows out; when the flexible rubber diaphragm 1 retracts, the float 1 in the upper pipe joint descends, and the liquid flows in.

[0004] Diaphragm pumps are used in the delivery of liquid raw materials for the preparation of pharmaceutical intermediates. Diaphragm pumps are widely used because they can effectively prevent liquid contamination and are suitable for high-viscosity fluids and highly corrosive liquids. Existing technologies also imitate the principles of diaphragm pumps for material delivery. However, during the use of diaphragm pumps, scale accumulates on the side of the diaphragm that contacts the liquid. Existing technologies are not convenient for automatically scraping the mechanism on the diaphragm, so scale accumulation on the diaphragm surface can hinder the movement of the pump, affecting the normal operation of the flexible rubber diaphragm, and thus affecting the liquid delivery efficiency. Scale accumulation can also reduce the accuracy of liquid delivery. Especially when precise proportioning is required in the pharmaceutical process, scale accumulation can make flow and pressure control inaccurate, thereby affecting the stability of the preparation process.

[0005] In summary, the prior art lacks a technology for automatically treating the fouling of the diaphragm of a diaphragm pump used for dispensing and delivering liquid raw materials for preparing pharmaceutical intermediates. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a dispensing device for preparing liquid raw materials for pharmaceutical intermediates.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a dispensing device for preparing liquid raw materials from pharmaceutical intermediates, comprising a diaphragm pump housing, a diaphragm installed on the inner wall of the diaphragm pump housing, a support plate slidingly provided on the inner wall of one side of the diaphragm pump housing, a transmission rod rotatably connected to the upper inner wall of the diaphragm pump housing, a rotating shaft rotatably provided on the lower inner wall of the diaphragm pump housing, a rotating sleeve rotatably provided on the inner wall of one side of the diaphragm pump housing, a push-pull mechanism rotatably provided on the outer wall of the rotating sleeve, a sleeve rod slidably provided in the rotating sleeve, and a diaphragm scraper rod slidably provided on the other end of the sleeve rod.

[0008] Preferably, a sliding frame is fixedly connected to the top of the support plate, and the sliding frame is slidingly matched with the inner wall of the diaphragm pump housing. A pushing head is fixedly connected to the inner wall of the top of the sliding frame, and an electric push rod is fixedly connected to one end of the sliding frame, and the other end of the electric push rod is fixedly connected to the inner wall of the diaphragm pump housing.

[0009] Preferably, a rotating ring is rotatably connected to the outer side of the support plate, and an annular rack A and an annular rack B are fixedly connected to the outer circle and the side of the rotating ring respectively. A plurality of striking rods are rotatably connected to the support plate, and the striking rods are arranged in sliding contact with the diaphragm. A transmission wheel is fixedly connected to one end of the striking rod, and the transmission wheel is meshed with the annular rack B at the side for transmission.

[0010] Preferably, a spiral groove is provided on the outer wall of one end of the transmission rod, and the inner wall of the spiral groove is slidably matched with the push head. One end of the transmission rod passes through the inner wall of the diaphragm pump housing and extends to the outside and is fixedly connected to a driving wheel.

[0011] Preferably, one end of the rotating shaft is fixedly connected with a gear A, and the other end of the rotating shaft is fixedly connected with a gear B, and the gear B is meshed with the annular rack A for transmission.

[0012] Preferably, a motor is fixedly connected to one end of the rotating sleeve, and the motor is fixedly connected to the diaphragm pump housing. A transmission gear ring is fixedly connected to the other end of the rotating sleeve, and the transmission gear ring is meshed with gear A for transmission.

[0013] Preferably, the push-pull mechanism includes a push-pull frame, the bottom end of the push-pull frame is slidingly matched with the outer wall of the rotating sleeve, a rotating rod is provided on one side of the push-pull frame, the top end of the rotating rod is rotatably connected to the diaphragm pump housing, and a driving shaft is fixedly connected on both sides of the bottom end of the rotating rod, and the driving shaft is sliding matched with the inner walls on both sides of the push-pull frame, and a driven wheel is fixedly connected to the top end of the rotating rod, and the driven wheel is meshed with the driving wheel for transmission.

[0014] Preferably, a limit block is fixedly connected to one end of the sleeve rod, a universal joint is rotatably provided on the inner wall of the sleeve rod, an adjusting wheel is fixedly connected to one end of the universal joint, an annular rack C is meshingly provided on one side of the adjusting wheel, the annular rack C is fixedly connected to the diaphragm pump housing, an L-shaped lever is fixedly provided on the other end of the universal joint, a limit ring is fixedly connected to one end of the sleeve rod, and the limit ring is rotatably connected to the inner wall of the bottom end of the push-pull frame.

[0015] Preferably, a limiting groove is provided at the bottom end of the diaphragm scraper rod, the limiting groove is slidably matched with the limiting block, a sliding groove is provided on the inner wall of the limiting groove, and the inner wall of the sliding groove is slidably matched with the outer wall of the L-shaped lever.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By arranging a rotating sleeve, a sleeve rod and a diaphragm scraping rod, the diaphragm scraping rod can be driven to reciprocate while rotating, and the scale on the side of the diaphragm in the diaphragm pump that contacts the liquid is automatically scraped off, which can maintain the smooth operation of the diaphragm and ensure the normal operation of the pump, thereby improving the stability and accuracy of liquid delivery, avoiding flow fluctuations or instability caused by scale accumulation, and achieving pharmaceutical production stability and product quality.

[0018] By providing a support plate, the diaphragm can be supported from the other side when the diaphragm scraper is scraping the dirt on the diaphragm, ensuring that the diaphragm remains stable during the scraping process, thus preventing the diaphragm from being deformed or broken due to uneven force, and improving the contact force between the diaphragm scraper and the diaphragm, thereby more effectively removing the dirt on the diaphragm surface;

[0019] By arranging a striking rod on the support plate, while the rotating sleeve drives the diaphragm scraping rod to rotate and remove scale, it can drive multiple striking rods to rotate, so that the striking rods can knock on the diaphragm, making it easier for scale to fall off the diaphragm surface, further improving the uniformity and efficiency of cleaning, reducing damage to the diaphragm, and reducing the need for manual cleaning, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a dispensing device for preparing liquid raw materials for pharmaceutical intermediates according to the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of the overall structure of a dispensing device for preparing liquid raw materials for pharmaceutical intermediates according to the present invention;

[0022] Figure 3 This is a schematic diagram of the support plate structure of a dispensing device for preparing liquid raw materials for pharmaceutical intermediates according to the present invention;

[0023] Figure 4 This is a schematic diagram of the transmission rod structure of a dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to the present invention;

[0024] Figure 5 This is a schematic diagram of the rotating shaft structure of a dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of a rotating sleeve and other components of a dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to the present invention;

[0026] Figure 7 This is a schematic diagram of the push-pull mechanism structure of a dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to the present invention;

[0027] Figure 8 This is a schematic diagram of a partial cross-section and expansion of a sleeve rod of a dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to the present invention; and a diaphragm scraping rod structure.

[0028] The following are marked in the figure: 1. Diaphragm pump housing; 2. Diaphragm; 3. Support plate; 4. Transmission rod; 5. Rotating shaft; 6. Rotating sleeve; 7. Push-pull mechanism; 8. Sleeve rod; 9. Diaphragm scraper rod; 301. Sliding frame; 302. Push head; 303. Electric push rod; 304. Rotating ring; 305. Ring rack A; 306. Striking rod; 307. Transmission wheel; 308. Ring rack B; 401. Spiral groove; 402, driving wheel; 501, gear A; 502, gear B; 601, motor; 602, transmission gear ring; 701, push-pull frame; 702, rotating rod; 703, driving shaft; 704, driven wheel; 801, limit block; 802, universal joint; 803, adjusting wheel; 804, ring rack C; 805, L-shaped lever; 806, limit ring; 901, limit groove; 902, slide groove. DETAILED DESCRIPTION

[0029] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may conceive of other obvious variations.

[0030] like Figures 1-8 The shown device is a dispensing device for preparing liquid raw materials from pharmaceutical intermediates, comprising a diaphragm pump housing 1, a diaphragm 2 being installed on the inner wall of the diaphragm pump housing 1, a support plate 3 being slidably provided on the inner wall of one side of the diaphragm pump housing 1, a transmission rod 4 being rotatably connected to the upper inner wall of the diaphragm pump housing 1, a rotating shaft 5 being rotatably provided on the lower inner wall of the diaphragm pump housing 1, a rotating sleeve 6 being rotatably provided through the inner wall of one side of the diaphragm pump housing 1, a push-pull mechanism 7 being rotatably provided on the outer wall of the rotating sleeve 6, a sleeve rod 8 being slidably provided in the rotating sleeve 6, and a diaphragm scraping rod 9 being slidably provided on the other end of the sleeve rod 8.

[0031] like Figure 3 As shown, a sliding frame 301 is fixedly connected to the top of the support plate 3, and the sliding frame 301 is slidably matched with the inner wall of the diaphragm pump housing 1. A pushing head 302 is fixedly connected to the inner wall of the top of the sliding frame 301. An electric push rod 303 is fixedly connected to one end of the sliding frame 301, and the other end of the electric push rod 303 is fixedly connected to the inner wall of the diaphragm pump housing 1. The electric push rod 303 is used to drive the connected sliding frame 301 to move, so that the sliding frame 301 drives the connected support plate 3 to support one side of the diaphragm 2. At the same time, the pushing head 302 on the sliding frame 301 will slide in the spiral groove 401, thereby driving the transmission rod 4 to rotate, so that the transmission rod 4 can drive the connected driving wheel 402 to rotate.

[0032] A rotating ring 304 is rotatably connected to the outer side of the support plate 3. Ring racks A305 and B308 are fixedly attached to the outer circumference and side edges of the rotating ring 304, respectively. Multiple striking rods 306 are rotatably connected to the support plate 3. The striking rods 306 are in sliding contact with the diaphragm 2. One end of the striking rods 306 is fixedly connected to a transmission wheel 307, which meshes with a ring rack B308 on the side. Gear B502 drives the rotating ring 304 connected to the ring rack A305 to rotate. The rotating ring 304, in turn, drives the transmission wheel 307 via the ring rack B308, which in turn drives the connected striking rods 306 to rotate.

[0033] like Figure 4 As shown, a spiral groove 401 is provided on the outer wall of one end of the transmission rod 4, and the inner wall of the spiral groove 401 is slidably matched with the push head 302. One end of the transmission rod 4 passes through the inner wall of the diaphragm pump housing 1 and extends to the outside and is fixedly connected to a driving wheel 402.

[0034] like Figure 5 As shown, one end of the rotating shaft 5 is fixedly connected to a gear A501, and the other end of the rotating shaft 5 is fixedly connected to a gear B502. Gear B502 is meshed with an annular rack A305 for transmission. When the rotating sleeve 6 rotates, it drives the connected transmission ring gear 602 to rotate. At this time, the transmission ring gear 602 drives the gear A501 to rotate, and then the gear A501 drives the gear B502 connected to the rotating shaft 5 to rotate.

[0035] like Figure 6As shown, a motor 601 is fixedly connected to one end of the rotating sleeve 6, which is fixedly connected to the diaphragm pump housing 1. A transmission ring gear 602 is fixedly connected to the other end of the rotating sleeve 6, which meshes with gear A501. Motor 601 drives the rotating sleeve 6, which in turn drives the sleeve rod 8 to rotate. The sleeve rod 8 then drives the diaphragm scraper rod 9 through a stopper 801 to rotate.

[0036] like Figure 7 As shown, the push-pull mechanism 7 includes a push-pull frame 701, the bottom end of which is slidably engaged with the outer wall of the rotating sleeve 6, a rotating rod 702 is provided on one side of the push-pull frame 701, the top of which is rotatably connected to the diaphragm pump housing 1, and a driving shaft 703 is fixedly connected to both sides of the bottom end of the rotating rod 702. The driving shaft 703 is slidably engaged with the inner walls of both sides of the push-pull frame 701, and a driven wheel 704 is fixedly connected to the top of the rotating rod 702. The driven wheel 704 is meshed with the driving wheel 402 for transmission. The driving wheel 402 can drive the rotating rod 702 connected to the driven wheel 704 to rotate. At this time, the rotating rod 702 will slide on the inner wall of the push-pull frame 701 through the driving shaft 703 at the bottom end, thereby driving the push-pull frame 701 to move, so that the push-pull frame 701 drives the sleeve rod 8 to move, so that the diaphragm scraping rod 9 on one side of the sleeve rod 8 approaches and contacts the diaphragm 2.

[0037] like Figure 8 As shown, a limit block 801 is fixedly connected to one end of the sleeve rod 8, and a universal joint 802 is rotatably connected to the inner wall of the sleeve rod 8. An adjusting wheel 803 is fixedly connected to one end of the universal joint 802. An annular rack C804 is meshed and driven on one side of the adjusting wheel 803. The annular rack C804 is fixedly connected to the diaphragm pump housing 1. An L-shaped lever 805 is fixedly connected to the other end of the universal joint 802. A limit ring 806 is fixedly connected to one end of the sleeve rod 8, and the limit ring 806 is rotatably connected to the inner wall of the bottom end of the push-pull frame 701. Under the action of the annular rack C804, the meshed adjusting wheel 803 rotates, which then drives the universal joint 802 to rotate, causing the universal joint 802 to drive the connected L-shaped lever 805 to rotate, allowing the L-shaped lever 805 to slide within the slide groove 902, thereby driving the diaphragm scraping rod 9 to reciprocate.

[0038] like Figure 8 As shown, a limiting groove 901 is provided at the bottom end of the diaphragm scraping rod 9, and the limiting groove 901 is slidably matched with the limiting block 801. A sliding groove 902 is provided on the inner wall of the limiting groove 901, and the inner wall of the sliding groove 902 is slidably matched with the outer wall of the L-shaped lever 805.

[0039] By arranging the rotating sleeve 6, the sleeve rod 8 and the diaphragm scraping rod 9, the diaphragm scraping rod 9 can be driven to move back and forth while rotating, and the scale on the side of the diaphragm 2 in the diaphragm pump that contacts the liquid can be automatically scraped off, which can maintain the smooth operation of the diaphragm 2 and ensure the normal operation of the pump, thereby improving the stability and accuracy of liquid delivery, avoiding flow fluctuations or instability due to scale accumulation, and achieving pharmaceutical production stability and product quality.

[0040] Working principle: During the process of dispensing liquid raw materials for the preparation of pharmaceutical intermediates by a diaphragm pump, when it is necessary to treat the scale on the diaphragm 2, the electric push rod 303 is first used to drive the connected sliding frame 301 to move, so that the sliding frame 301 drives the connected support plate 3 to support one side of the diaphragm 2. At the same time, the push head 302 on the sliding frame 301 slides in the spiral groove 401, thereby driving the transmission rod 4 to rotate, so that the transmission rod 4 can drive the connected driving wheel 402 to rotate;

[0041] Then the driving wheel 402 can drive the rotating rod 702 connected to the driven wheel 704 to rotate. At this time, the rotating rod 702 will slide on the inner wall of the push-pull frame 701 through the driving shaft 703 at the bottom end, thereby driving the push-pull frame 701 to move, so that the push-pull frame 701 drives the sleeve rod 8 to move, so that the diaphragm scraping rod 9 on one side of the sleeve rod 8 approaches and contacts the diaphragm 2;

[0042] Then the motor 601 is used to drive the connected rotating sleeve 6 to rotate, and the rotating sleeve 6 will drive the sleeve rod 8 to rotate, and then the sleeve rod 8 will drive the diaphragm scraping rod 9 to rotate through the limit block 801;

[0043] At this time, under the action of the annular rack C804, the meshed adjusting wheel 803 rotates, and then the adjusting wheel 803 can drive the universal joint 802 to rotate, so that the universal joint 802 can drive the connected L-shaped lever 805 to rotate, so that the L-shaped lever 805 can slide in the slide groove 902, thereby driving the diaphragm scraping rod 9 to reciprocate, thereby improving the descaling effect;

[0044] At the same time, when the rotating sleeve 6 rotates, it will drive the connected transmission ring gear 602 to rotate. At this time, the transmission ring gear 602 will drive the gear A501 to rotate, and then the gear A501 will drive the gear B502 connected to the rotating shaft 5 to rotate. At this time, the gear B502 will drive the rotating ring 304 connected to the annular rack A305 to rotate. At this time, the rotating ring 304 will drive the transmission wheel 307 to rotate through the annular rack B308, so that the transmission wheel 307 can drive the connected striking rod 306 to rotate. At this time, the striking rod 306 will contact the diaphragm 2, causing the diaphragm 2 to vibrate, which is beneficial to improving the descaling efficiency.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A dispensing device for preparing liquid raw materials for pharmaceutical intermediates, comprising a diaphragm pump housing (1), characterized in that: The inner wall of the diaphragm pump housing (1) is provided with a diaphragm (2), and a support plate (3) is provided on the inner wall of one side of the diaphragm pump housing (1) in sliding cooperation. A sliding frame (301) is fixedly connected to the top of the support plate (3). The sliding frame (301) is provided in sliding cooperation with the inner wall of the diaphragm pump housing (1). A push head (302) is fixedly connected to the inner wall of the top of the sliding frame (301). An electric push rod (303) is fixedly connected to one end of the sliding frame (301). The other end of the electric push rod (303) is fixedly connected to the inner wall of the diaphragm pump housing (1). A rotating ring (304) is provided on the outer side of the support plate (3) in rotation connection. An annular ring (304) is fixedly connected to the outer circumference and the side of the rotating ring (304). Rack A (305) and annular rack B (308), a plurality of striking rods (306) are rotatably connected on the support plate (3), the striking rods (306) are arranged in sliding contact with the diaphragm (2), one end of the striking rod (306) is fixedly connected with a transmission wheel (307), the transmission wheel (307) is meshed with the annular rack B (308) at the side for transmission, the upper inner wall of the diaphragm pump housing (1) is rotatably connected with a transmission rod (4), the outer wall of one end of the transmission rod (4) is provided with a spiral groove (401), the inner wall of the spiral groove (401) is arranged to slide with the push head (302), one end of the transmission rod (4) passes through the inner wall of the diaphragm pump housing (1) and extends to the outside and is fixedly connected with an active The wheel (402) is provided with a rotating shaft (5) on the inner wall of the lower side of the diaphragm pump housing (1), and a rotating sleeve (6) is provided on the inner wall of one side of the diaphragm pump housing (1) for rotational connection. The outer wall of the rotating sleeve (6) is provided with a push-pull mechanism (7) for rotational connection. The push-pull mechanism (7) includes a push-pull frame (701), the bottom end of the push-pull frame (701) is provided with a sliding fit with the outer wall of the rotating sleeve (6), a rotating rod (702) is provided on one side of the push-pull frame (701), the top end of the rotating rod (702) is provided with a rotational fit with the diaphragm pump housing (1), and a driving shaft (703) is fixedly provided on both sides of the bottom end of the rotating rod (702), and the driving shaft (703) is provided with a sliding fit with the inner walls on both sides of the push-pull frame (701). The top of the rotating rod (702) is fixedly connected with a driven wheel (704), the driven wheel (704) is meshed with the driving wheel (402) for transmission, a sleeve rod (8) is slidably provided in the rotating sleeve (6), one end of the sleeve rod (8) is fixedly connected with a limit block (801), the inner wall of the sleeve rod (8) is penetrated by a universal joint (802) for rotational connection, one end of the universal joint (802) is fixedly connected with an adjusting wheel (803), one side of the adjusting wheel (803) is meshed with an annular rack C (804), the annular rack C (804) is fixedly connected with the diaphragm pump housing (1), and the other end of the universal joint (802) is fixedly connected with an L-shaped shifting rod (805).One end of the sleeve rod (8) is fixedly connected to a limit ring (806), and the limit ring (806) is rotatably connected to the inner wall of the bottom end of the push-pull frame (701). The other end of the sleeve rod (8) is slidably matched with a diaphragm scraping rod (9). The bottom end of the diaphragm scraping rod (9) is provided with a limit groove (901), and the limit groove (901) is slidably matched with the limit block (801). The inner wall of the limit groove (901) is provided with a slide groove (902), and the inner wall of the slide groove (902) is slidably matched with the outer wall of the L-shaped shifting rod (805).

2. The dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to claim 1, characterized in that: One end of the rotating shaft (5) is fixedly connected to a gear A (501), and the other end of the rotating shaft (5) is fixedly connected to a gear B (502), and the gear B (502) is meshed with the annular rack A (305) for transmission.

3. The dispensing device for preparing liquid raw materials from pharmaceutical intermediates according to claim 2, characterized in that: One end of the rotating sleeve (6) is fixedly connected to a motor (601), and the motor (601) is fixedly connected to the diaphragm pump housing (1). The other end of the rotating sleeve (6) is fixedly connected to a transmission gear ring (602), and the transmission gear ring (602) is meshed with the gear A (501) for transmission.

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